Ocean bottom seismometers: the German DEPAS pool
The 48 broad band instruments that will be deployed around La Réunion during the RHUM-RUM experiment are provided by the German pool DEPAS ("Deutscher Geräte-Pool für amphibische Seismologie" / "German instrument pool for amphibian seismology). They have the following characteristics :
- Geophone, gimbal-mounted Güralp CMG-40T, 60 sec - 50 Hz
- Hydrophone HighTechInc HTI-04-PCA/ULF, 100 sec - 8 kHz
- Digital data recording unit Send Geolon MCS, 24 bit, 1 - 1000 Hz, 20 GB
- Acoustic release transponder Kum K/MT 562 and Kum K/MT 8011M onboard unit
- VHF radio beacon Novatec RF-700A1 and Seimac DR500 bearing receiver
- Xenon flashlight Novatec ST-400A
- Floating unit Syntactical foam
- Frame and pressure tubes Titanium alloy
- Anchor Iron
- Maximum deployment depth 6000 meters
- Maximum deployment duration 19 months
- Dimensions (excl. flag and beacons) 1.65 m x 1.30 m x 0.72 m
- Dimensions (incl. flag and beacons) 2.80 m x 1.30 m x 0.72 m
- Weight (excl. anchor) in air / in water 340 kg / -30 kg
- Weight (incl. anchor) in air / in water 405 kg / 27 kg
More informations on the instruments DEPAS on the AWI web site (Alfred Wegener Institute, Bremerhaven, Germany)