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Here are some of the articles that have been recently posted to the PASSCAL website:

Streckeisen STS-2 Broadband Sensor

Salient Features: Flat response to velocity from 120 seconds to about 10 Hz Low power Installation Tips: Example of STS-2/RT130 Setup One-pager field sheet

  Troubleshooting Tips: If you cannot center the masses of even one of the 3 elements of the STS-2, all your data could be compromised. The document provided here will guide you to a 'manual' process for attempting to get those masses centered, IF and ONLY IF the masses do not center after repeated (a dozen tries) centering commands.  
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Quanterra Q330

The Q330 is a 3 or 6 channel high resolution datalogger. It is low power and highly configurable for a wide range of applications and sensors. The Q330 is housed in a sealed aluminum enclosure which makes it highly resistant to the environment. Telemetry is a main focus of the Q330, but it also has a robust on-site data storage system which uses external Balers. This makes it easy to swap out the data storage on-site for when servicing doesn't allow an extended visit. The Q330 can write data to four different receiving systems simultaneously. It also has built-in sensor controls, an automatic mass recentering feature, and calibration functions. The Q330 is programmed with a Windows program called Willard, it can also be controlled by a PalmOS program for when working in the field.


Visiting PASSCAL


Visitors to the PASSCAL Instrument Center should have pre-arranged appointments. Visitors should enter through the main entrance of the building and register their visit in our “Visitor’s Log”. Unarranged or unannounced visits cannot be accommodated. Please contact respective staff or send an email to if you wish to arrange a visit.


The PASSCAL Instrument Center is located in Socorro, New Mexico, on the New Mexico Tech campus.

IRIS Committee Members: find travel tips, expense report forms, and more here.

Sercel L-28-3D 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 30.4 V/m/s.  Used for (but not limited to) active source (land and off-shore excitations), glacial movements, local earthquake and aftershock studies. Manufacturer Documents

Download the Brochure to obtain information about the L-28 geophones.

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40Hz High Frequency Sensor

Salient Features:

PASSCAL owns two types of 40Hz vertical geophones.

The 40Hz geophones for the Multichannel Digitizer Systems are manufactured by Sercel and Geospace.  These vertical geophones are critically damped at 0.555 and have a sensitivity of about 21 V/m/s. The 40Hz geophones for the Texan Digitizers these geophones are manufactured by Sercel.  These vertical geophones are critically damped at 0.555 and have a sensitivity of 35.3 V/m/s

Uses primarily include active source studies.

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Array of Arrays: Elusive ETS in the Cascadia Subduction Zone

ETS, or 'episodic tremor and slip', is a recently discovered phenomenon in seismic research. Similar to earthquakes but much smaller in magnitude, ETS events are associated with the subduction zone of some convergent plate boundaries. One such region, the Cascadia subduction zone under the Puget Sound, is the focus of an experiment by Ken Creager's group at the University of Washington (UW), called Array of Arrays.


  How long will it take? Training at the PASSCAL Instrument Center takes an average of 2 days to cover a typical experiment.    The first day involves an overview from the PI, a discussion of proposed logistics, introduction or review of project instrumentation and a practice site installation.  The second day covers station servicing and demobilization, the PASSCAL suite of software for data download and review, and introduction or review of PASSCAL preferred database and data archiving procedures. What can you expect from us?  Training on the hardware that PASSCAL Instrument Center will provide for your experiment.  This will include the Digitizer, Sensor(s), Handheld controllers, and Power Systems.
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