Refraction Shooting

     JSC “MAGE” uses a specialized research vessel «Geofizik» to perform refraction surveys.

 

Geophysical Equipment and Instruments

Automatic Bottom Seismic System

 ABSS-5
No. of Channels 4 (X, Y, Z, H)

Hydrophones SM-6 frequency range

 5(10) - 250; sensitivity 20 V/m/c

Geophones SMG.110.06.01.00 frequency range

 1 - 8000, sensitivity 25 mkV/Pa
Current consumption Not more than 60 mA
Recorded Frequency Band From 5(10)* to 1600 Hz
*defined by the characteristic of installed geophone from 0,01 Hz
Subbands 5 - 100; 200; 400; 800; 1600 Hz
Sampling Period 4; 2; 1; ½; ¼ ms
Full Dynamic Range Not less than 140 dB
Capacity of Analog – Digital Converter, delta – sigma type 24
Efficacy Noise Level
average level according to gain factors and subbands		 Not more than 0,3 mcV
Gain Factors 1; 2,5; 8,5; 34; 128
Supply Voltage

Operability in a range of 9-15V
Endurance 30 - 60 days
Seismic Data Recorded in Compact Flash, 4 Gb
Geophones and Hydrophone Built in Recorder Case
Digital Compass Recording Position of Stations at the Bottom Available
Immersion depth Not less than 5000 m
Slant Distance of Hydroacoustic System Operation

Not less than 7000 m
Weight 30 kg
Operating Temperature Range From minus 10 to plus 60 degree Celsius
Sealed Container Shape Sphere, 380 mm in diameter
Air-Gun Elastic Wave Source Puls-6-100
Effective Volume of Single Chamber 100 l
Air-Gun Elastic Wave Source Puls-6-30
Effective Volume of Single Chamber 30 l
Frequency Spectrum Band 1 – 30 Hz
Effective Pressure of Compressed Air 13.0 – 13.5 MPa
Onboard Seismic Device

PC with basic software package for initialization and parameter setup for ABSS work before deployment and reading of seismic data after a line
Onboard Seismic Device for Seismic Data Analysis PC with basic package RadExPro+ for data assessment and travel-time curve design

Onboard hydroacoustic device

to establish communication between the vessel and seismic unit
«Automatic Bottom Seismic System»

ABSS-5