Kit for seismic research performance

The Kit for seismic research performance consists of the recorder (portable ZETSENSOR suite), digital geophones interconnected by mains cable into a receiving line and a task-specific software package used for data recording and analysis.

The kit for seismic research performance is used for performing measurements in various climatic zones. Splash-proof connections GSC-4H (Herma-4) are used for establishing a reliable connection between the geophones within the seismic system.

Small weight of the kit for seismic research performance (3,14 kg per 100 m of the measuring line) is attributed to the use of  4-wiereв telemetric 6,5 mm cable.

The distance between cable branches (i.e. the distance between the connected geophones) is variable and depends on Customer’s requirements.

From 6 786 USD

Specifications0

of the Kit for seismic research performance

Metrological specifications
Measured physical value vibration velocity
Frequency range of the sensing element from 0,5 up to 1250 Hz
Readings instant
Measurement range (depending on sensing element) 0,0006…60 mm/s
Technical specifications
Number of channels from 16 up to 512
Sampling rate 100, 200, 500, 1000, 2500 Hz
Transducer type digital geophone
Data transfer interface CAN 2.0
 GPS synchronization yes
Interface connection to PC USB/Ethernet
Data conversion 24 bit ADC
Data transfer interface CAN 2.0
Exchange rate 300 Kbps
Programmable gain 128, 64, 32, 16, 8, 4, 2, 1
Offline recorder up to 32 Gb
Trigger yes
Data format Seg-Y
Data processing method* Refraction, Reflection, MASW
Performance specifications
Power rate 18 – 24 W
Power consumption 10 W
Offline operation time 4 hrs
Length 120 m – 250 m
Operating temperature range  -10 +40 °C
Indicator signal level for each of the transducers

number of navigational satellites

precise time (based on the satellites’ data)

battery level of the recorder

recording speed

data unloading process upon completion of the impact event

Control keys 2 pcs

The data-compression system based on delta-encoding process allows to implement unloading of the event (2 seconds duration, 2,5 kHz sampling frequency from all the measuring channels (24 pcs) within a quite short time period – about 20 seconds.

* Data processing is performed by Third-party Software

Advantages

of the Kit for seismic research performance

Synchronization

of all geophones within the kit of seismic research performance

Measurement results

are transmitted in digital format

Scalability

variable length of the kit for seismic research performance: 120 – 1000 m

Product version

2 versions available (black and orange) depending on the particular task

Portability

compact dimensions enable surveys performance in any environment

Reliability

stable performance and high reliability throughout operational life

Description

of the Kit for seismic research performance

The kit for seismic research performance is a portable system for seismic surveys incorporating digital geophones ZET 7155 that are sequentially interconnected with the mains cable into a measurement line. the main cable has up to 24 cable branches for connection of the geophones. The main cable is connected to the standalone seismic recorder (portable ZETSENSOR kit), which is further connected to PC or tablet PC of the operator via USB cable or Wi-Fi.

The maximum possible length of the kit for seismic research performance line is 250 meters. The geophones are connected to the system by means of GSC-4H (Herma-4) connectors. The maximum amount of the digital geophones within a single measuring line is 24 pcs.

Digital geophones ZET 7155 have a function of automated calibration: as the geophones are deployed at the survey location, a task-specific software is used to send a test signal to each of the geophones. After that, based on measurements results, it is possible to evaluate the damping ratio and natural oscillations level of each sensing element. The corresponding data is saved in transducers settings to be further used for amplitude and FR correction in the course of measurements performance. Thus, with the minimum possible participation of the operator, it is possible to have a fully-calibrated kit for seismic research performance.

The geophones should be mounted vertically with the maximum possible angular deviation of ± 30º.

For more comprehensive research of the controlled area and three-dimensional seismic surveys performance, it is possible to use several suites for seismic research to be evenly distributed along the controlled area. This will enable simultaneous (all the seismic recorders are in synch with each other) and comprehensive data acquisition. The kit for seismic research performance is quite universal due to its scalability features.

One more advantage is the use of 4-wired 6,5 mm cable enabling connection of any amount of digital geophones and contributes to the minimum possible weight of the measuring line (3,14 kg per 100 meters of measuring line).

The kit for seismic research performance has a number of additional advantages:

  • high data transfer capacity
  • stable quality of signal transmission for long distances without deterioration of transferred signal quality
  • reduction of transducers’ natural oscillations level by 10 dB (it is attributed to instant data processing)
  • high cost-efficiency of the kit for seismic research performance (up to 10 times if compared to currently available analogs)
  • portability of the system due to the use of telemetric cable, which is 7 times lighter than a similar analog cable

The figure shows 24-channel digital cable of the kit for seismic research performance (to the left), 16-channel analog cable (in the middle) and 24-channels analog cable (to the right).

Kit for seismic research performance - 24-channel connecting cable - general view

The offline recorder is represented by portable  ZETSENSOR system (a set of interface modules placed inside of a compact plastic casing). Standard delivery scope includes:

  • offline recorder ZET 7173, (for the recording of seismic events and operation of the kit for seismic research performance in offline mode);
  • interface module ZET 7174, for connecting to the laptop via USB;
  • synchronization module ZET 7175, for geophones time sync based on satellites signals;
  • digital indicator  ZET 7178, (for indication of readings from each of the geophones, battery charge level, and SD-card memory indication);
  • logical analyzer ZET 7160, (for detecting seismic events following the impact hammer signal);
  • battery module.

Sequency of seismic surveys

with the use of the kit for seismic research performance

  • Preparation

    • installation of the digital geophones on site
    • connection of the kit for seismic research performance to the recorder
    • connection of the trigger to the recorder
    • activation of the recorder, control of the digital geophones connection
  • Measurement performance

    • shock impact
    • data recording control
  • Data transfer to PC

    • connection of the recorder to the PC
    • saving the files with the use of the program “Select files to convert”
    • control of the saved data in the program “View of historical events”
  • Conversion of the files to Seg-Y format

    • selecting the event for conversion in the program “View historical events”
    • saving the event in Seg-Y format with *.seg extension

Seismic surveys

with the Kit for seismic research performance

A seismic survey is a geophysical method of geological objects survey using elastic vibrations or seismic waves. The seismic surveys are based on two major methods – one of them is based on reflected waves and the other – on the refracted waves.

Seismic survey methodology is based on studying waves cinematics (i.e. the time of waves shifting from the source of impact to the seismic receivers, recording dynamics and strength of waves). Seismic event recording by means of a kit for seismic research performance is conducted in the following way: the geophones located in the survey area transmit mechanical oscillations into electric signal and send it to the offline recorder via the cable of the geophones line. The recorder registers and processes the signals. As a result of signal processing, one can define the depth of the geo-seismic section, its location, wave speed. Using these geo-seismic data one can obtain geological characteristics of the surveyed area.

The research depth is up to 250 meters depending on waves propagation environment. In order to obtain high-precision data, it is recommended to use longer measuring lines with a large amount of measuring channels.

The charts below depict information of seismic events registered by the kit for seismic research performance in the course of a test survey.

Kit for seismic research performance - interface of Seisomgraph program used for data acquisition and processing
Kit for seismic research performance - interface of Multi-channel oscilloscope program used for frequency response evaluation

For the purpose of further analysis, the data is saved in the  Seg-Y format to be further processed by RadExPro Software.

As a result of automated data processing, we can see an image of the seismic environment.

Then the seismic sections undergo additional processing in order to outline seismic borders and geological objects (this process implies participation of a specialist). As a result, we can see a seismic section with clearly outlined borders and elastic properties data.

Kit for seismic research performance - interface of Inversion program - image of seismic environment based on the accumulated survey data

Kit for seismic research: tests performance and obtained data processing

You can find more videos on seismic surveys in the Clause Video lessons and on our YouTube channel Zetlab Public

Settings and diagnostics

of digital geophones

Settings and diagnostics of digital geophones forming the kit for seismic research performance can be conducted in the survey area. In order to do this, you can use a special configuration kit which is included in the basic delivery scope.

All you need is a laptop with pre-installed ZETLAB Software and a compact device which can be carried in the laptop case.

Kit for seismic research performance - the components used for configuration of digital geophones parameters

Application scope

of the Kit for seismic research performance

Geophysical surveys
Building structure control system
Seismic surveys
Leak detection systems

Delivery scope

of the Kit for seismic research performance

Kit for seismic research performance - general view of components, cases for storage and transportation

The delivery scope of the Kit for seismic research performance includes:

  • seismic recorder (the length is variable depending on your request)
  • digital geophones ZET 7155 (their number is variable depending on your request)
  • offline recorder (recorder and a set of measuring modules ZET 7173, ZET 7174, ZET 7175, ZET 7178, ZET 7160)
  • K22-0,5/1 cable for connection of the measuring line to the seismic recorder  FQ14-4TJ-7 — GSC-4H (Herma-4)
  • power supply module for the recorder A04-19
  • a  kit for diagnostics of digital sensors (ZET 7174, ZET 7070, K22-0,5/1 cable – 1 pc, K15/1-1,8 USB cable – 2 pcs, K11/1-2 Ethernet Cable – 1 pc)
  • ZET Key (USB-key with the software)
  • CD with ZETLAB Software for data recording and representation
  • set of operational documentation
  • terminal resistance 120 Ohm
  • screwdriver
  • notebook, pen
  • case for measuring system storage

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