LDEO Trawl Resistant OBS

The LDEO trawl-resistant (TRM) ocean bottom seismometer was designed in 2012 for use on the heavily-fished continental shelf. The TRM comprises a heavy, low steel shield that is designed to deflect the lower leading line of bottom trawl nets. The TRM is lowered onto the seafloor from the ship and recovered using popup buoys or remotely-operated vehicles. Each OBS is equipped with a Trillium Compact seismometer, a Paroscientific absolute pressure gauge, and a hydrophone. Twenty TRMs were built for the Cascadia Initiative and were first deployed in 2011. There are currently 19 TRM OBS in the fleet.

Specifications

Response

The figure below shows the LDEO Cascadia broadband instrument nominal response for the most recent generation of instruments.

** NOTE: ALL INSTRUMENT RESPONSES FOR RESEARCH PURPOSES SHOULD BE DOWNLOADED FROM THE IRIS DMC *

For instructions on how to download instrument responses please go to the Requesting Instrument Responsespage.

Trillium Compact Seismomter

Amplitude Response

Absolute Pressure Gauge

Amplitude Response