The "German instrument pool for amphibian seismology" (Deutscher Geräte-Pool für amphibische Seismologie | DEPAS) provides broadband-onshore stations and ocean bottom seimometers for the preferred use within amphibious projects. The onshore component is maintained by the GFZ, the offshore component is operated by the Alfred-Wegener-Institute Helmholtz-Centre for Polar and Marine Research in Bremerhaven (AWI).
For the marine part of the DEPAS instrument pool look at http://www.awi.de/en
The DEPAS is part of the Modular Earth Science Infrastructure | MESI at GFZ.
EarthData PR6-24 Recorder
45 Units 3 Channels (all Units with USB connector)
Hard Disk, 150 units
25 Units 30.0 GByte
125 Units 40.0 GByte
Parameters - Input Signal
Channels 3 , plus 4 auxiliary used for seismometer mass position
Preamplification 0.4; 1; 10
Clipping Signal Channels: 40 Vpp @ PreAmp = 0.4 Auxiliary Channels: 20 Vpp
Digital Signal
Sampling Rate 1; 2; 4; 5; 10; 20; 25; 40; 50; 75; 100, 120; 125; 150; 200; 250; 300; 375; 500; 600; 750; 1000 sps; 3000 sps (reduced dynamic range);
Resolution MiniSEED, ASCII: 2.5 microVolt/digit ( @ PreAmp = 0.4 ) digitiser output: 3.9, nanoVolt/digit
Dynamic Range 140 dB @ 100 sps, 145 dB @ 25 sps (4 Byte digitiser output 150 dB), 96 dB @ 3000 sps (upper 2 Bytes only)
Time Keeping
Clock 1*10e-6 (TCXO)
Synchronisation GPS, continuously or cycled
Digitiser Buffer
RAM (volatile) 16 MByte
Format 4 Byte
Data Storage
Hard Disk 30.0 GByte (Data Partition 27.3 GByte,FAT 32), 40.0 GByte (Data Partition 36.6 GByte, FAT 32)
Storage Format ASCII, upper 3 Bytes of digitiser output MiniSEED, compressed (Steim-1), based on upper 3 Bytes 'legacy', PR2400 multiplex (equivalent to digitiser output)
Physical Parameter
Power Consumption < 1.8 Watts (GPS cycled) to 2 Watts (GPS conti) @ 3*100 sps
Weight Recorder, including disk: 4.3 kg (new series 3.75 kg)
Operating Temperatures Recorder and Disk: -20 to +65 °C
Connectors (Front Panel, Hard Disk)
Power Consumption
GÜRALP CMG-3ESP Compact
The GÜRALP CMG-3ESP Compact, made by GÜRALP, is a force balance broadband seismometer. Adaptor cables are available for EarthData recorders.
Pool Contents
Seismometer, 45 units GÜRALP CMG-3ESP Compact
Mechanical Parameters
Sensor 3 orthogonal sensors
Resonances above 140 Hz
Control - Zero position (re-center pulse input)Mass lock
Signal Output
Generator Constant 2 * 1000 Vs/m
Response Ground velocity from 60 sec to 50 Hz
Max. Output ±20 V
Physical Parameters
Power Consumption 0.75 Watts @ 12 V
Weight 8.3 kg
Operating Temperatures -10 to +65 °C
Connectors