Instrumentation

Offshore apllication:
The OBS is cased in a glass sphere which can be deployed up to water depths of 6700 m, recording seismic signals directly on the seafloor with a gimbal mounted 3K-geophone and a deep sea hydrophone. The instrument has no connection to the sea surface and is recovered by acoustic or time release. Rechargeble batteries provide the power supply for 28 days continous recording and data are retrieved from the 16 GB flash memory by wireless connection.
In order to increase the density of recording, vertical hydrophone arrays can be deployed. This type of survey allows a WARRP evaluation, prestack migration and eventually CDP processing of the obtained data in shallow or deep water.

Onshore apllication:
During land operations, an integrated GPS-receiver triggers the internal clock and provides the station coordinates. Input impedance can be adjusted to the type of geophone used. The six channels available offer various combinations of vertical and horizontal geophones e.g. six individual vertical or two three-component (3K) geophones.
The land version of the SEDIS has a waterproof housing. It is light and easy to handle. Its robust construction has been tested under all possible environments including deserts, jungles and sub-zero conditions.