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

Active Seismic Sources Committee Charge

Charge of the Advisory Committee on EPIC Active Seismic Sources

The Incorporated Research Institutes for Seismology (EarthScope) currently provides seismic recording instruments to the academic and government seismology research community. Although much of the community’s seismology research is carried out in a “passive” mode of operation, in which researchers are recording seismic signals from natural or ambient seismic sources, a subset of the EarthScope community relies on “active” seismic sources in which the researchers generate seismic signals using a variety of mechanical and chemical sources.

06/22/2009
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SiRF Clocks in the Field as of August, 2008

Number of SiRFs Exp. Number Experiment Name 4 200551 Costa Rica Subduction (Nicoya) 2 200559 HLP-lite (aka pre-HLP) 2 200604 Anatahan Volcanoes 1 200609 CAFE 3 200611 CRB-Wallowa 2 200617 PIRE 1 200622 Carpathians 1 200655 Mexico ETS
06/17/2009
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Teledyne Geotech S-13 Short Period Sensor

Teledyne Geotech S-13 Short Period Sensor

This passive 1-Hz sensor is seldom used because there are not many in the EPIC fleet and they have essentially been replaced by the CMG-40T-1Hz feedback seismometers. Information about S-13's from the old website can be found here.

The S-13's are heavy and awkward. The three components are separate units (about 20lbs each). They have strong magnets (passive seismometers), so they require about 12-inch spacing between each component.

05/19/2009
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Mark Products L-4C

Mark Products L-4C

 EPIC has very few of these 1-Hz passive seismometers, and does not have plans to replace parts that fail. Thus, they are likely to be discontinued, as they are cannabalized for spare parts and lost to attrition. Information from the old website can be found here and the cable drawings can be found here.

05/19/2009
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EarthScope Primary Instrument Center
New Mexico Tech
100 East Road, Socorro, NM 87801