Seismics Archives - Geotools

MAE ST24 12 / 24 CHANNELS 24 BIT SEISMOGRAPH

Paul Ssali — Wed, 28 Aug 2024 11:58:28 +0000

Description

24 bit seismograph for seismic prospecting with refraction, reflection, active and passive MASW (Re.Mi.), SASW, Down-hole, Cross-hole, seismic tomography, HVSR investigation methodology. The unit is equipped with a capture card with 24 bit resolution. It is possible to serialize two units to reach 48 channels. Through the management software, to be installed on any PC or notebook connected to the acquisition unit, it is possible to set all the parameters relating to the type of seismic survey that you intend to carry out with maximum simplicity and speed.

Methodologies

REFRACTION SEISMIC
REFLECTION SEISMIC
M.A.S.W
SEISMIC DOWN-HOLE/CROSS-HOLE
Re.M.i / ESAC
SEISMIC TOMOGRAPHY
M.A.A.M

Technical Specifications

General

ADC technology: 24bit Delta-Sigma ADC

Geophone number: 24 + 1

Acquisition: Active and passive

Dimensions: 27x24x17 cm

Weight: 3.5 kg

Export compatibility: .seg2; .csv

In-line test: Geophone test, noise analysis

Case: IP67

Enviromental condition: -20°C / 80°C

Power supply: Internal Li-ion battery

Autonomy: > 7h

Acquisition

Dynamic range: 144 dB (dynamic); 109 dB (at 1ms sampling)

Broadband: -3dB at 3500 Hz

Frequency: from 250Hz to 48kHz active; 251Hz, 502Hz, 1008Hz passive

Gain: from 0 to 42dB

Samples per event: 6255 pretrigger; 29127 acquisition

Anti aliasing: -3dB, 80% Nyquist’s frequency, -80dB

Common mode rejection: 110 dB a 50Hz

Input signal: ±2.5V

Trigger type: Differential trigger, geophone selectable

Trigger channel acquisition: Yes

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MAE X824S SEISMOGRAPH 24 / 96 CHANNELS – 24 BIT

Paul Ssali — Wed, 28 Aug 2024 11:01:56 +0000

Description

Top-range seismograph equipped with 24-48-72-96 embedded channels for active and passive seismic surveys. X824S basic configuration integrates 24 channels and can be expanded with 24 channels modules, without external boxes, up to maximum 96 integrated channels. Instrument has a PC with 10” monitor and operative system Windows 10. Management of all settings, acquisition parameters, recording and visualization of recorded data, are performed sequentially and in an intuitive manner by means of the operative system installed on the instrument, which includes also a guide with step by step instructions for the realization of the most common surveys. High flexibility together with high dynamic range make X824S the ideal solution for every kind of active and passive seismic survey: surface seismic investigations such as Refraction, Reflection (P and S waves), M.A.S.W. , Re.Mi. , E.S.A.C., bore-hole surveys such as Down Hole and Cross Hole, stand-alone passive station H.V.S.R. and vibrational monitoring. With particular regards to seismic methodologies, 24 channels module allows the use of a single cable with 24 takeouts that, together with integrated battery pack, reduces the number of accessories to bring on site.

Methodologies

REFRACTION SEISMIC
REFLECTION SEISMIC
M.A.S.W
SEISMIC DOWN-HOLE/CROSS-HOLE
SEISMIC VIBRATION MONITORING
NAKAMURA METHOD, HVSR, H/V
Re.M.i / ESAC
SEISMIC TOMOGRAPHY
M.A.A.M

Technical Specifications

General

ADC technology: 24bit Delta-Sigma ADC

Geophone number: from 24 to 96 + 1

Acquisition: Active and passive

Dimensions: 50x40x20 cm

Weight: 6 kg

Display: 10″ touch screen

GPS: Yes

Export compatibility: .seg2; .csv

In-line test: Geophone test, noise analysis

Case: IP67

Enviromental condition: -20°C / 80°C

Power supply: Internal Li-ion battery

Autonomy: >7h

Acquisition

Dynamic range: 144 dB (dynamic); 109 dB (at 1ms sampling)

Broadband: -3dB at 3500 Hz

Frequency: from 250Hz to 48kHz active; 251Hz, 502Hz, 1008Hz passive

Gain: from 0 to 42dB

Samples per event: 6255 pretrigger; 29127 acquisition

Anti aliasing: -3dB, 80% Nyquist’s frequency, -80dB

Common mode rejection: 110 dB a 50Hz

Input signal: ±2.5V

Trigger type: Differential trigger, geophone selectable

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MAE VMR624 STAND ALONE SEISMOGRAPH, 6 CHANNELS – 24 BIT

Paul Ssali — Wed, 28 Aug 2024 10:07:30 +0000

Description

Stand-alone seismic digitizer specific for seismological studies and monitoring of seismic events. Instrument is designed for the automatic recording and saving of each seismic event on internal memory or sending to data collection center according to chosen mode. Unit management and programming can be done by Ethernet connection or by integrated GPRS / UMTS module. Unit is totally manageable remotely and is equipped with a high resolution (24 bit) acquisition card, with a dedicated sampler for each input channel. It is characterized by Compactness and Resistance. The data communication module and the integrated web server allow visualization of data acquired from the instrument in real time on any device connected to internet by accessing the dedicated page.

Local and remote alarm management: instrument allows the setting of alarm thresholds and, when they are exceeded, it is possible to send remote alarm signals with preset modes by the user and to activate locally the signs of visual signaling, warning signs, traffic lights, flashing lights or acoustic type such as sirens or prerecorded voice messages. Reporting of any threshold overruns can be notified in various ways such as an alarm call, SMS, mail. It is possible to install VMR624 even in remote areas or without an electric network by powering seismograph through photovoltaic kits of different power. The unit allows continuous monitoring of vibrations and noise generated by sources outside the structures, such as road or rail traffic, construction or demolition activities, the operation of impulsive machines, or from sources inside the structure such as the movement of people, movement of vehicles and materials, machine vibrations, etc. Through admitted vibration limits, instrument allows, in accordance to current regulation UNI 9916 (2014), to set programmable alarm thresholds upon which alarms are sent according to user’s configuration. Alarm reporting via SMS or e-mail and sending data over the network are a strong point for timely and constant monitoring and for an easier access to the data of all the operators involved in monitoring. The flexible architecture of the unit it allows its functioning in stand-alone and in network modes.

– Stand-alone operation. The alarm management is based on the continuous interpretation of the input signals on 6 channels, the coincidence of thresholds exceeding individually set by one or more channels for a settable time determines the remote alarm signaling via sms and locally via relay activation. The alarm condition also determines the recording of the event on the internal memory and the optional sending via website for a time that can be set to allow subsequent processing. The data download by customer is possible by direct GPRS connection or by Ethernet connection. In case of an optional 3G or LAN connection, in the event of an alarm, the digitizer can send data directly to web portal, so as to limit time required for event visualization by assigned staff.

– Network operation: the unit provides continuous transmission by Ethernet network (preferential channel) or 3G (secondary channel) of the 6 channel acquisition data. In case of lack of both transmission channels, unit registers locally until they are restored. The acquisition center will analyze data, determine the epicentres and magnitude and the warning of the competent authorities. Using the relay outputs, different types of local alarm signals can be configured in both visual and acoustic such as sirens, setting an activation time. Exceeded the limits of vibration thresholds, maximum amplitude in speed (mm / s) imposed by the law, you can enable notifications through SMS and email up to 5 final recipients so as to ensure a timely reporting of any critical situations. VMR624 can also be installed in remote areas or without an electric network using accessory photovoltaic kits.

Methodologies

DYNAMIC SURVEYS ON STRUCTURES

One of the key issues related to the stability and durability of modern buildings and such infrastructural works as masterpieces or places of historical interest, is represented by the assessment of the response to dynamic stresses they may be subjected to in the course of their lives as a result of those phenomena that can be continuous or constant over the time (such as the effect of the vehicular traffic, the wind on a bridge or the seismic events). In these cases it is necessary to accurately measure both speeds and accelerations that the structures can hold up without any significant damage. In order to measure the movements produced by dynamic stresses, it is necessary to use real-time sensors, because speed and frequency of the movements are so high to require data acquisition architectures usually made up of accelerometers with characteristics that vary depending on the investigated object and connected to high resolution acquisition systems. Below the main targets of the dynamic surveys on structures:

– Checking the project’s validity and consequent compliance to it in the realization of the work performed

– Dynamic characterization of infrastructures, buildings, historical monuments affected by temporary or permanent vibrations induced by: urban, rail or any kind of heavy traffic

– Real response of the structures to events of hydrologic or seismic instability.

– Monitoring of damages or breaks of structural elements caused by induced vibrations

– Verification of the work’s durability prevision

SEISMIC VIBRATION MONITORING

The survey methodologies based on passive seismic may be of “on time” type, where the instrument performs a constant recording of the signals coming from the sensor connected to it, or of “trigger” type.

TRIGGER BASED SEISMIC MONITORING

The seismic vibrations monitoring called “trigger”, or threshold, is one of the methodologies the non-destructive testing (CND) surveys are made up of and it is widely used within structural monitoring and dynamic surveys on the structures. In the trigger acquisitions such “stand alone” seismographs are used; these are specifically designed for the continuous seismic monitoring, where even if they are constantly listening, they are ready to start recording as soon as an event exceeding the trigger threshold (time 0 , start of recording) set in the instrument at the programming time. The sensors used are usually the tri-axial low frequency 1, 2 Hz type. The use of trigger seismic vibrations allows:

– to assess the consequences of seismic vibrations generated by vehicular traffic or temporary construction sites on buildings, infrastructure and surrounding houses, in order to assess their potential dangerousness on them.

– to plan eventual corrective actions in the traffic circulation, in the works progress modalities, in order to avoid breaks, irreparable structural damages or buildings collapses in case of construction sites.

– to constantly monitor (at low cost) the state of monuments and buildings of particular value

– to allow (at the design beginning of works and infrastructures) avoiding any accident during the work, coming from specific problems of the site that cannot be detected by any other methods of surveys.

TIME BASED SEISMIC MONITORING

This technique is used to obtain information concerning possible dynamic amplification effects of seismic waves in “emersion”. It is based on the recording of the background noise in the time domain and following elaboration of the signal’s frequencies in the domain. It is carried out by placing a tridimensional geophone on the ground with low frequency response and by recording the seismic noise in different temporal windows. Later on, the study of the spectrums obtained from the convolution of the frequency of the signal recorded in the domain for the three components of the ground motion and the application of techniques on spectrum analysis, allows to define and measure possible local seismic amplifications and the seismic frequency of the site. The measurements of the microearthquake can also be taken in linear “arrays” for the localization of faults.

Seismic monitoring is carried out in areas subject to risks related to a seismogenic activity, by acquiring the seisms with time and recording the seismograms. Seismic stations are used able to record in threshold or continuous type, and low frequency geophones or seismic accelerometers. The recording in the long period, of the earthquakes relative to a site or fairly large area allows to configure the seismic scenario of an area and evaluate the risk and vulnerability conditions. If the monitoring activity is supported by specific knowledge of geological and geo-technicaltype, we are talking about seismic Micro-zoning.

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MAE ST6 6 CHANNELS – 24 BIT SEISMOGRAPH

Paul Ssali — Wed, 28 Aug 2024 09:13:20 +0000

DESCRIPTION

Seismograph for active and passive seismic, equipped with 6 channels, 24 bit resolution, extremely compact and easy to use. Instrument is managed through an intuitive application which must be installed on a PC or tablet with Windows operative system connected to the instrument through USB interface. Ideal for stand-alone passive seismic methodologies such as seismic vibration at time or trigger threshold, non destructive test, surveys on buildings with three-dimensional sensors and HVSR investigations. Management software can be installed on every notebook or netbook and allows to interface with instrument for the management and configuration of recording parameters for all the different typology of seismic investigations. Connection between notebook – tablet and ST6 is made through an USB interface present on instrument panel. Instrument extremely compact dimensions, its reduced weight and quite competitive price, make it particularly ideal to the use in specific situations which require a rugged, reliable and at same time small instrument, easy to transport even in logistically complicated situations. It is possible to connect to ST6 seismograph both 1D (6 channels) and 3D sensors (12 channels), therefore it is particularly recommended also for structural vibrations monitoring.

METHODOLOGIES

SEISMIC DOWN-HOLE/CROSS-HOLE

Down-Hole Seismic Exploration

This type of survey is performed for the mechanical characterisations of grounds crossed during the probing phase. The technique consists in the measurement of the travelling times of the elastic waves between the seismic source on the surface and the geophones located inside the probing hole, properly conditioned with PVC pipe or geo-technical pipe. The seismic exploring activity in the down-hole takes place by placing one or more triplets of sensors (horizontal and vertical) inside one of the probing holes and at various depths, aimed at receiving the seismic signals generated through ram on anchored plate. Energy will be supplied in phase inversion in order to polarise phases S on a horizontal plane H, according to an orientation of 180°. Through seismic speeds Vp and Vs, it is possible to obtain information, such as elastic modules and geo-seismic parameters. Vs 30 can be measured on probing holes up to 30 metres of depth (O.P.C.M 3274/2003).

Cross-hole Seismic Exploring

This type of survey is performed through the physical –dynamic characterisation of the portion of ground between the two probing holes. The technique consists in the measurement of the travelling times of the elastic waves between the source located in a hole and the geophone/s located in another hole/s at the same depth. The cross-hole is made by introducing the borehole in one of the holes and the tridimensional geophone (or geophones) in another hole/s aimed at receiving the seismic signal incoming from the source at the same level. The elastic modules and mitigations of the medium between the holes can be obtained from this test.

Nakamura Method, HVSR, H/V

A significant part of the damages observed in destructive earthquakes all over the world is associated with the amplification of seismic waves due to the effects of the local site. The analysis of the site response is therefore essential in the evaluation of the seismic risk in areas subject to earthquakes. In order to evaluate the effects of the local site, a series of surveys must be carried out. Among the empiric methods, the method of spectrum analyses H/V on environmental vibrations is one of the most common. The method, also called “Nakamura” technique (Nakamura, 1989), was introduced by Nogoshi and Igarashi (1971) based on the initial studies of Kanai and Tanaka (1961). Since then, many researchers worldwide performed a large number of applications.

An important requirement to carry out the H/ V method consists in a fairly good knowledge of seismology combined with basic information on local geological conditions supported by geo-physical and geo-technical data. The method is generally applied in micro-zoning studies and in the analysis of the local response of specific sites.

M.A.A.M

The analysis of the Rayleighwavesdispersion(velocityphase) can be performed according to the Miniature Array Analysis of Microtremors (MAAM)passive technique. Thisisa methodologythat in many ways issimilar to the ESACone, which enables to delineate the Rayleigh waves dispersion curve by using 3/4 geophones (together with a three-component triad, which is also useful to perform HVSR acquisitions). The strength of this approach is in its effectiveness, considering the few meters space available, and therefore making it particularly interesting for urban applicaton suses. The technique involves arranging the geophones according to triangle or pentagon geometries,with a radius that typically ranges between 0.5 and 5m. This defines the dispersion curve in a frequency range that is proportional to the action radius itself. It goes without saying that, especially when working in urban areas with limited room for maneuver, the MAAM approach represents the onlyeffectiveusefulsolutionto define the Rayleighwavedispersioncurvesin passive mode.

MAAM acquisition parameters

sampling rate: 4ms (Nyquist frequency 125 Hz

acquisition length 30 min

radius: 2 + 5m

sensors: four vertical 4.5 Hz geophones and 1 tricomponent sensor

Dal Moro G., 2014 Surface Wave Analysis for Near Surface Applications Publisher: Elsevier

Less is More (Dal Moro et al., 2015) – GNGTS 17-19 November 2015 – Trieste (Italy)

REFRACTION SEISMIC

The seismic exploration of refraction type is among the most diffused and used active seismic methods.

This type of survey has the purpose to determine the thickness of the overburdens (aerated) above a rigid sub-layer and reconstruct a seismic stratigraphic sequence in terms of apparent longitudinal speed. If carried out according to more sophisticated calculation methods, it can be used to intercept, measure and characterize geo-structural profiles.

Seismic exploration of refraction type is carried out by placing equidistant geophones in line on the ground, and generating seismic pulses through mechanical “inputs”.

Then the travelling times of the pulses that once penetrated in the ground are refracted nearby the lithological passages at different density, will be measured.

Technical Specifications

GENERAL

ADC technology: 24bit Delta-Sigma ADC

Geophone number: 6

Acquisition: Active and passive

Dimensions: 21x17x9 cm

Weight: 0.5 kg

Export compatibility: .seg2; .csv

In-line test: Geophone test, noise analysis

Case: IP67

Enviromental condition: -20°C / 80°C

Power supply: External source

ACQUISITION

Dynamic range: 144 dB (dynamic); 109 dB (at 1ms sampling)

Broadband: -3dB at 3500 Hz

Frequency: from 250Hz to 12kHz active; 251Hz, 502Hz, 1008Hz passive

Gain: from 0 to 36dB

Samples per event: 6255 pretrigger; 29127 acquisition

Anti aliasing: -3dB, 80% Nyquist’s frequency, -80dB

Common mode rejection: 110 dB at 50Hz

Input signal: ±2.5V

Trigger type: Single-ended trigger, external channel

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4B-Dolang Telemetry (Cable-connected) Seismic Systems up to 1000 Channels

Paul Ssali — Sun, 30 May 2021 05:28:04 +0000

Seismic system expandable from 12 channels to 1,000 channels……and anything in between!

THINK BIG RIGHT FROM THE START.! ……Don’t be restricted to only 24 channels as most Seismic manufacturers have created the culture to keep you purchasing multiple 24 channel units. In a way it’s not affordable and retards your career growth keeping in small seismic jobs.

With a Dolang telemetry system, you can start with 12 or 24 channels today, however the seismograph is designed to operate up to 1000 channels. You just have to purchase more geophone units.

This unique ability to expand a system to specific need grants you so much leverage and versatility to grow your business from small 24 channel refraction surveys to bigger jobs without huge capital investment into new bigger system but gradually expanding an existing system.

48 CH TELEMETRY SYSTEM

JEA247E500 MANUAL ENG [7.390 Kb]

Field acquisition with JEA247E500

brochure j [1.414 Kb]

Ethiopian Series JEA247E500

Seismograph 12 channel with 15 FDU. Trigger units are in red from 1ch to 2 ch – 6ch to 7 ch – 11ch to 12 ch

The operator can choose from the notebook Panel Acquisition.

Please download the MANUAL with technical specifications JEA247E 500 [7.486 Kb]

Geophone

TELEMETRY SEISMOGRAPH JEA247E500

THE PHOTO IS A SAMPLE OF MODULE of 12 CHANNELS, with seismic cables, 12 FDU + 3 FDU Trigger, MOM, 12 Geophones 4,5 Hz and Notebook, Full Waterproof 1 mt or 15 mt. if necessary

JEA247E500 full telemetry system from 12 to 240 channels
The weight of the 24 channels including acquisition electronics and connectors is less than 15 kg
The first 24 ch have the possibility to operate for continuosly for hours acquisition at frequencies 250-500 Hz, this allows easy acquistion for file 20 ‘– 30‘ with a single file, very practical thing for passive seismic.

For applications ESAC, ReMi, SPAC, MAM.
Naturally MASW, FTAN, SASW. REFRACTION, REFLECTION. Following different parameters of acquisition

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Seismic Sources ACCELERATED DROP WEIGHT awd33

Paul Ssali — Wed, 02 Dec 2020 23:34:15 +0000

https://geodevice.co/main/seismic/sources/hammers/awd33/

Main features:

P and S wave generation
Compact design
High energy of pulse
Ideal repetition of impacts
Hammers of different weights

See the effectiveness and simplicity of the source

Detailed Description

AWD-33 is a variant of seismic source of the “weight drop” type. The striking mass (hammer) is accelerated with the aid of massive stretching springs that are armed by means of an electric winch powered by a car battery (65–180 A/h). The minimum period of operation of the source is 3 s.

The source AWD-33 is mounted on a compact lightweight frame equipped with reliable wheel blocks. The delivery package of the source includes one hammer: 10, 20 or 33 kg. Hammers of another weights can be supplied additionally. The design of device allows hammer’s fast replacing in the field. The source can be used on a rugged terrain. The total weight of the source with a battery pack and a 33 kg hammer is less than 100 kg. The energy of a single impact reaches 600 J.

It is possible to develop fastenings for a car, ATV, cross-country vehicle or any other transport.

The set includes:

Source AWD-33
Wired control console
Technical manual

Can be acquired additionally:

Additional hammer
Sealed (gel) battery 90 A*h
Automatic battery charger
Trigger switch
Titanium alloy plate for hammering

Type of waves	pressure
Minimum response time	3 s
Weight (with additional hammer and battery)	< 100 kg
The energy of a single impact	600 J
Weight of additional hammer	10/20/33 кг
Frame material	steel

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Seismic Sources ACCELERATED DROP WEIGHT awd-40

Paul Ssali — Wed, 02 Dec 2020 23:11:09 +0000

https://geodevice.co/main/seismic/sources/hammers/awd40/

Main features:

See the simplicity of this source

P and S wave generation
Compact design
High energy of pulse
Ideal repetition of impacts
Hammers of different weights

Detailed Description

AWD-40 is a variant of seismic source of the “weight drop” type. The striking mass (hammer) is accelerated with the aid of massive stretching springs that are armed by means of an electric winch powered by a car battery (65–180 A/h). The minimum period of operation of the source is 3 s.

The source AWD-40 is mounted on a compact lightweight frame equipped with reliable wheel blocks. The delivery package of the source includes one hammer: 20, 33 or 40 kg. Hammers of another weights can be supplied additionally. The design of device allows hammer’s fast replacing in the field. The source can be used on a rugged terrain. The total weight of the source without battery pack is less than 120 kg. The energy of a single impact reaches 1000 J.

The source can be mounted on a trailer, trunk of a pickup, a four-wheeler or a compact wheel pair (tow bar — four-square).

The set includes:

Source AWD-40
Wired control console
Technical manual

Can be acquired additionally:

Additional hammer
Sealed (gel) battery 90 A*h
Automatic battery charger
Trigger switch
Titanium alloy plate for hammering

Type of waves	pressure
Minimum response time	3 s
Weight (with additional hammer and battery)	< 120 kg
The energy of a single impact	1000 J
Weight of additional hammer	20/33/40 kg
Frame material	steel

https://www.youtube.com/watch?v=0Pb3H1Fd8Gg&feature=youtu.be

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Seismic Sources ACCELERATED DROP WEIGHT

Paul Ssali — Wed, 02 Dec 2020 22:22:29 +0000

https://geodevice.co/main/seismic/sources/hammers/33ps/

Main features:

P and S wave generation
Compact design
High energy of pulse
Ideal repetition of impacts
Hammers of different weights

Detailed Description

AWD-33PS is a variant of seismic source of the “weight drop” type. The hammer is equipped with an inclined platform, allowing it to be installed at an angle of 45 degrees, and a special stop, adding stability in an upright position, what allows to perform survey on shear waves.

The striking mass (hammer) is accelerated with the aid of massive stretching springs that are armed by means of an electric winch powered by a car battery (65–180 A/h). The minimum period of operation of the source is 3 s.

The source AWD-33PS is mounted on a compact lightweight frame equipped with reliable wheel blocks. The delivery package of the source includes one hammer: 10, 20 or 33 kg. Hammers of another weights can be supplied additionally. The design of device allows hammer’s fast replacing in the field. The source can be used on a rugged terrain. The total weight of the source with a battery pack and a 33 kg hammer is less than 100 kg. The energy of a single impact reaches 600 J.

It is possible to develop fastenings for a car, ATV, cross-country vehicle or any other transport.

The set includes:

Source AWD-33PS
Wired control console
Technical manual

Can be acquired additionally:

Additional hammer
Sealed (gel) battery 90 A*h
Automatic battery charger
Trigger switch
Titanium alloy plate for hammering

Type of waves	pressure and shear
Minimum response time	3 s
Weight (with additional hammer and battery)	< 100 kg
The energy of a single impact	600 J
Weight of additional hammer	10/20/33 kg
Frame material	steel

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Marine Seismic Energy Sources ELECTRODYNAMICS BOOMER

Paul Ssali — Wed, 02 Dec 2020 10:33:31 +0000

https://geodevice.co/main/seismic/source/marine-seism/g-boomer/

Main features:

UHR seismic source
Vertical resolution up to 10 cm
Applicable for fresh water and marine environments
Stable and repeatable broadband signature
Easy infield operations

Detailed Description

G-Boomer with MultiJack energy source is an ultra-high resolution marine acquisition setup, which is typically used for detailed stratigraphic studies and geological mapping in relatively shallow depths.

G-Boomer is an easy-to-operate marine seismic source with stable broadband wavelet shape up to 5 kHz, providing vertical resolution up to 10 cm. It is applicable for operations in both fresh and salt waters. To provide deeper penetration several boomer plates can be combined on single frame. 2G and 4G boomers with 2 and 4 plates correspondingly are available for purchase for the deeper subsurface imaging with highest possible vertical resolution.

Geodevice team is ready for cooperation and developing customized equipment for special customer’s needs and ideas. We have an experience of manufacturing modified version of G-Boomer source with significantly increased central frequency (up to 4 kHz) by the client’s request.

Full acquisition setup includes towed HV power coaxial cable, MultiJack energy source, towed hydrophone array HRStreamer and seismograph. Additionally, deck winches for HV cable and streamer with slip ring can be purchased to provide fast and safe deployment and recovery of UHR marine equipment during field operations.

We provide trainings, technical support and consultancy services, as well as processing of high-resolution marine seismic surveys.

Data examples:

Lake Ladoga, G-Boomer HF source, MultiJack-500HP1.5 energy source:

	G-Boomer	2G-Boomer	4G-Boomer
Plates	1	2	4
Maximum pulse energy	300 J	600 J	1 200 J
Recommended pulse energy	50 – 250	100 – 500	200 – 1 000
Maximum input power	600 J/s	1 200 J/s	2 400 J/s
Frequency bandwidth	up to 5 kHz
Recommended MultiJack	500HP1.5	500HP1.5	2500HP3.0
Recommended coaxial HV cable	1×10	1×20	1×50
Plate size	380×380×100 mm
Catamaran	stainless steel

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Marine Seismic Sources Sparker

Paul Ssali — Wed, 02 Dec 2020 06:08:12 +0000

https://geodevice.co/main/seismic/source/marine-seism/fws-sws/

Main features:

High repeatable broadband signal
Suitable for any type of HR/UHR surveys
Replaceable electrode groups
Adjustable depth
Stainless steel frame

Detailed Description

Sparker is a marine seismic source, which generates acoustic signal by discharging an electrical pulse and is typically used for high-resolution (HR), ultra-high-resolution marine seismic surveys and VSP. Typically, sparkers are used in marine seismic acquisitions in seas and oceans, as salt water is a good current conductor. Salt Water Sparkers (SWS) of various configurations are available for this purposes. Fresh Water Sparkers (FWS) is a series of sparkers, which are specifically designed to work in fresh waters due to special containers with embedded multi-tip groups. Deep Water Sparkers (DWS) series is developed to ensure operations away from the surface and perfectly suited for deep-towed marine surveys and VSP.

SWS, FWS and DWS multi-tip sparkers with MultiJack energy source and HRStreamer provide state-of-art HR/UHR marine seismic acquisition solution, which can be used over a wide water depth range – starting from very shallow up to deepest Earth regions.

All type of sparkers produce high repeatable broadband signal, suitable for any type of HR/UHR seismic surveys with vertical resolution up to 30 cm such as geohazard seismic assessment, detailed stratigraphic studies, platform site surveys, windfarm surveys, oceanography studies. Frequency content of emitted signal can be adjusted by number of tip levels and energy per electrode, participating in the shot generation.

High durability of electrodes guaranteed by negative discharge technology used in MultiJack energy sources, which is typically referred to a non-wearing technology, preserving electrodes over a long time period.

Typical sparker systems are built with coaxial wires, assuming 10 J energy per tip as the optimal shooting mode. We have developed special sparker electrodes from unique material to acquire data with higher possible energies per tip, without any harmful consequences. This technology allows to reduce central frequency of the sparker by increasing energy per electrode, in case if deeper penetration is needed.

It can also be used for towed sparker system – while towing deeper, frequency content of the signal will be higher due to increase of hydrostatic pressure. This effect can be compensated by increasing energy per tip, keeping frequency range in spec.

Geodevice offers a full range of modern acquisition equipment, suitable for high resolution subsurface imaging. Complexity and variability of state-of-the-art shallow seismic data acquisition requires adequate processing approaches. RadExPro seismic processing software is fully capable for advanced single channel, multichannel, 2D, 3D high-resolution (HR) and ultra-high-resolution (UHR) marine data processing.

Geodevice team is ready for cooperation and developing customized equipment for special customer’s needs and ideas.

Please, contact us for generating the most suitable high resolution marine acquisition setup for your purposes. We will consider all the requirements and provide you with the best solution to achieve high quality image, starting from acquisition up to final data delivery. We provide trainings, technical support and consultancy services, as well as processing of high-resolution marine seismic surveys

Data examples:

Kara Sea, SWS-600 source, MultiJack-5000HP4.5 energy source

Courtesy of MAGE

Lake Ladoga, FWS-250 source, MultiJack-2500HP3.0 energy source :

Lake Ladoga, FWS-125 source, MultiJack-500HP1.5 energy source :

Lake Onega, FWS-100 source, MultiJack-1200HP energy source

Kara Sea, SWS-270 source, MultiJack-5000HP4.5 energy source

Courtesy of OJSC AMIGE

Lake Baikal, FWS-100 source, MultiJack-1200HP energy source

Courtesy of FSUE VSEGEI

Chukchee Sea, SWS-800 source, MultiJack-5000HP4.5 energy source

Courtesy of LLC SPLIT

Type	Model	Max energy	Levels	Max J at level	Tips at level	Groups at level	Recommended MultiJack	Recommended coaxial HV cable
Freshwater	FWS-125	1 250	1	1250	126	2	1250HP1.5	2×10
	FWS-250	2 500	1	2500	252	4	2500HP3.0	4×12.5
	FWS-500	5 000	1	5000	504	4	5000HP6.0	4×12.5
Conventional marine	SWS-125	1 250	1	1250	126	2	1250HP1.5	2×10
	SWS-250	2 500	1	2500	252	4	2500HP3.0	4×12.5
	SWS-500	5 000	1	5000	50	4	5000HP6.0	4×12.5
	SWS-1000	10 000	1	10000	1008	4	10000HP12	4×12.5
	SWS-2500	25 000	1	25000	2520	6	25000HP12	6×16.7
Dual-level marine sparkers	2×SWS-250	5 000	2	2500	252	2	2×2500HP3.0	4×12.5
	2×SWS-500	10 000	2	5000	504	4	10000HP12 or 2×5000HP6.0	2×(4×12.5)
	2×SWS-1000	20 000	2	10000	1008	4	25000HP12 or 2×10000HP12	2×(4×12.5)
	2×SWS-2500	50 000	2	25000	2520	6	50000HP12 or 2×25000HP12	6×50
Triple-level marine sparkers	3×SWS-250	7 500	3	2500	252	2	3×2500HP3.0	6×16.7
	3×SWS-500	15 000	3	5000	504	2	3×5000HP6.0	6×16.7
	3×SWS-1000	30 000	3	10000	1008	2	3×10000HP12	6×50
	3×SWS-2500	75 000	3	25000	2520	2	3×25000HP12	6×50

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