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FairfieldNodal ZLand 3-Channel Sensor

The FairfieldNodal ZLand 3C is a compact all-in-one 3-channel sensor & datalogger with onboard GPS timing, and a self contained power supply. Originally designed for use in large N industry deployments, it has been adopted by the academic community as a useful sensor for both active and short-term passive deployments.

Unlike other sensors & dataloggers at PASSCAL, use of the ZLand 3C requires a deployment plan to be filed in advance with PASSCAL for sensor and handheld unit pre-programming.  Likewise, the units must be sent back to PASSCAL for data offload.

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Nanometrics Trillium 120 Posthole Broadband Sensor

Note:  PASSCAL has purchased 11 Nanometrics Trillium 120PH seismometers.

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Community Broadband Sensor Repair Policy

ver. 2011093

The PASSCAL Instrument Center (PIC) has historically honored requests to repair community owned broadband seismometers. Significant resources are required to process, evaluate, and repair a broadband instrument. To ensure that we are able to properly administer these requests and that we are offering these services consistently to all members of the IRIS community, the following policy will govern the PASSCAL Instrument Center's handling of these requests.

Updated Instrument Response for Trillium_120, Trillium_240 (2 Generations) and Taurus

Instrument Response files released from Nanometrics for Trillium 120 and Trillium 240 sensors have been evaluated and updated for Antelope, where they are used to generate dataless and RESP files.

Sensor Certification

Introduction:

All equipment, especially sensors and cables, are cleaned and comprehensively tested when they arrive at the PIC, regardless of whether the equipment are newly delivered from the manufacturer or being returned from an experiment.  PASSCAL makes every effort to ensure that all equipment are operating to the manufacturers specifications.

This article outlines the procedures undertaken and metrics employed by the PIC to verify that sensors operate within manufacturers specifications.

Procedures:

All sensors returning from a field experiment are subject to the following procedures:

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Guralp CMG-40T-1 Short Period Sensor

The CMG 40T-1sec seismometer looks, on the outside, just like the CMG 40T-30sec, intermediate period seismometer. Its response, however, is tuned to short-period signals (1-100Hz). One hundred of these feedback seismometers were purchased for the Flexible Array sensor pool.

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Poles and Zeroes

All poles and zeroes in radians/sec

Sensors for Year Round Polar Programs

Cold Rated Guralp CMG-3T

The Guralp CMG-3T seismometer is a 3-axis broadband instrument that has a flat response to ground velocity between 120s and 100Hz.  It has been tested to operate down to -55C and only draws 0.3W of power.

PASSCAL's Polar program has purchased the cold-rated 3Ts (with active logic high) for broadband experiments in Antarctica.  When powered and locked, the reported mass positions will be '0'.  This does not mean that the instrument is dead or unpowered.  Once the 'unlock' command is initiated, first the lock/unlock and then the centering motors should run and finally result in meaningful mass position readouts.

The CMG-3T has a low tilt tolerance and is sensitive to temperature changes, it therefore requires a well established and well thermally isolated vault.

Sensors for Summer Only Polar Programs

Your choice of seismic sensor for Polar research will depend on your scientific targets. PASSCAL has a wide range of both passive and active seismic sensors appropriate for controlled source, local or regional seismicity, ice dynamics or teleseismic studies. A comparison of our sensors can be found here.

Short Period Sensors

These are typically used for controlled source experiments, short term, local seismicity or ice studies.  The instruments available are the Sercel L-28 and L-22.  The L-28 is a 4.5Hz 3 component geophone while the L-22 is a 2Hz 3 component seismometer.

Geospace Y-28 (GS11-3D) High Frequency Sensor

  Salient Features: This 3-channel sensor has a frequency of 4.5Hz, is critically damped at .707 and has a sensitivity of 32 V/m/s. Used for (but not limited to) active source (land and off-shore excitations), glacial movements, local earthquake and aftershock studies. Manufacturer Website: http://www.geospace.com/ PASSCAL Documents: Connector wiring information here Installation & Troubleshooting Documents: Y-28 Orientation and Installation Tips here One-pager field sheet
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