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

Guideline Documents


May 7, 2009


Here are links to documents that will help you to think about seismic station siting considerations and seismic vault construction during planning stages, field reconnaisance, and instrument deployment. Also included here are links to guidelines and procedures for station installation and station servicing.


Field Documents

Going to the field?

This section will help you get started with the basics on:

Huddle testing Station siting Seismic vaults Station installation Working with Responses to Get Units of Ground Motion
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Station Installation Procedure


PASSCAL station installations can vary according to the type of equipment being used, the physical environment, and also the legal responsibilities due the land owner or administrator.  For the latter, it is assumed that the full consent of the land owner/administrator for the station to be installed, operated for the required duration, and then final removal has been obtained.  It is further assumed that state laws regarding digging permits are also being followed. See also Guidelines for Station Installation.

Installing a PASSCAL seismic station involves the placement of a number of different, but coupled, sub-systems, including (but not limited to):

Station Enclosures


Sierra Negra Volcano, Galápagos Islands Deployment

In July and August of 2009, seven scientists deployed several seismic sensors for a two-year multidisciplinary study of one of the world's most active volcanoes, the Sierra Negra Volcano of the Galápagos Islands. The project's official name is “Collaborative Research: An integrated seismic-geodetic study of active magmatic processes at Sierra Negra volcano, Galápagos Islands.”

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Batholiths Experiment

The Batholiths experiment is a seismic refraction and wide-angle reflection survey across the Coast Mountains batholith of British Columbia, Canada. Several PASSCAL staff members will be deployed on the Batholiths Experiment in July of 2009. This project will involve over 2300 Texans and 1900 4.5Hz geophones in a combination of single-channel and three-channel station configurations, and will utilize two separate Field Centers.

Read more about the Batholiths Project at the Batholiths Website, and in a summary by PIs John Hole, George Spence and Kate Miller (810 kB).

A pair of photographic essays on Batholiths 2009 can be found here (short version) and here (long version).

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RefTek RT130 Timing Errors Affecting PASSCAL and FA Experiments

August 20, 2008 Updated: December 15, 2008. Program refj31fix released

Stations Affected: RT130 connected to a 130-GPS/01 with SiRF ublox Trimble module installed (aka SiRF-type)

Description of Problem: Starting on July 31st 2008 (julian day 213 2008) the SiRF-type started to shift in time by a second.  Since the 31st July 2008 the mysterious time shifts (back and forth) continue. At present SiRF has no explanation for these time shifts.

Identifying SiRF GPS:

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Programming a Q330 with a Clie

To program a Q330 with a Clié you need to use either the "Q330 B147" or "Q330 1.491t" program. These programs can be found on the main menu of any Clié received from PASSCAL. These programs are used to send or retrieve parameters/configurations, change station names, change IP addresses, and to send commands to a Q330.

Important note: To program a Q330S (which is different from a normal Q330) you MUST use the program "Q330 1.491t"

Guralp CMG-3T Broadband Sensor

  Salient Features: 120s - 50 Hz flat velocity response Remote electronic mass locking, unlocking and centering. Installation & Troubleshooting Documents: Example of 3T/RT130 setup One-pager field sheet
Manufacturer's Documents: Guralp CMG-3T Manual Datasheet, Manual & Quick Start Guide
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Guralp CMG3-ESP Broadband Sensor

Salient Features 30sec to 50 Hz flat velocity response Manual Mass locking/unlocking Remote Mass Centering Response Characteristics:

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