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

Grounding when Static is a Problem

Grounding of remotely-powered stations (not AC-powered), for stations where static charge is a problem.

This note concerns only those stations utilizing a remote autonomous power system and solar panels. Systems that will be using AC power should contact the PIC staff for more information on safely using these types of power sources.

Grounding of DAS units should only be attempted in extreme cases where static charge is a problem (for example, failing equipment such as external GPSes). Attempts to ground DAS units can lead to ground loops if not properly done, or even if done to best practices!  It should only be attempted when the sensor itself has been isolated from ground by a non-conducting plate such as a tile or phenolic pad.  Pads which are not part of the original vault design can also cause stability/noise problems, and must be well coupled to the base of the vault or concrete.

PASSCAL SEG-Y Trace Header

 PASSCAL SEG-Y utilizes big endian byte order and sets the various trace headers as outlined below.


PASSCAL SEG-Y Trace Header


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.

Huddle testing feedback-sensors and dataloggers


“Huddle”-testing sensors before field deployment is a key part of any seismic experiment.  Huddle-testing involves testing almost all components of the field station, for many stations, in parallel.  The number of stations that can be tested at one time is limited only by availability of personnel and lab space.

Huddle-testing potentially reduces crew time spent in the field, cost of the experiment and the need to revisit sites.  Huddle-testing improves crew consistency and most importantly, the likelihood of successful station deployments and survival.

Shipping Best Practices

Taking care of "First things First" Once you have successfully completed your online "Instrument Use Agreement", reviewed the "Data Delivery Policy" and signed your "PI Acknowledgment", your are ready to move on to the next step. Planning is Crucial Helpful Tips "Straight from the horse's mouth" 

"Being able to import your equipment quickly is key to a successful deployment.... so don't wait until the last minute."   


"Each country is different, so ask a lot of questions and don't assume anything."

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Equipment Certification

All equipment, especially dataloggers, 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, and that all on-board consumables (such as betteries, etc) are fresh.

This article contains links to pages on procedures and metrics employed in the routine certification of:

Sensors Dataloggers
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