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

Kinemetrics Episensor ES-T Accelerometer


Salient Features:

The Kinemetrics EpiSensor force-balanced accelerometer is a uniaxial surface package designed primarily for structural engineering applications. However, it can be used in a variety of applications for measuring accelerations up to ±4g and down to the ambient noise level. With full-scale recording ranges of ± 0.25 to ± 4g (user selectable) the EpiSensor provides on-scale recording of earthquake motions even at near-fault locations and in a wide variety of structure types.

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Station Installation Suggested Materials List


One of the worst things that can happen during a deployment, especially a highly remote deployment, is not having the correct tools or supplies.  The following is a minimum suggested list of things to take if you are constructing a station that will house PASSCAL equipment for more than a few weeks. This list is in addition to the construction materials that will be used to make vaults, enclosures and fences.  Usually this would pertain to passive-source, broadband (or midband) experiments that deploy equipment for 1-2 years and will be visited approximately every three months during that time in order to check the data and the condition of the station.  PASSCAL will advise if any other specialty tools are required.  Please adjust quantities to provide for all installation teams and number of stations.

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General Information

Welcome to the PASSCAL General Information web pages. Here you will discover how to borrow PASSCAL equipment, learn about the equipment and services we provide, and browse past, current and future experiments scheduled to use our facility.

Borrowing Equipment Equipment Inventory Experiment+Schedules Training Shipping Information Governing Policies Meet the PASSCAL Standing Committee Contacts Visiting PASSCAL Acknowledgment, Citation, and Logos Employment at PASSCAL
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Software Resources


PASSCAL provides open-source software for downloading seismic data from data recorders, for quality assessment, and for conversion to other data formats for analysis and archiving at the IRIS Data Management Center.

PASSOFT is supported only for Mac and Linux operating systems, and not for Windows. Some Windows users have been able to use PASSOFT by first installing a Windows Subsystem for Linux.

Note: PQL is no longer distributed with PASSOFT. We have replaced PQL functionality on PASSCAL provided laptops with SQLX. SQLX is a commercial package ( that provides all of the capabilities of PQL in addition to suite of enhanced features. If you still require the 2011 version of PQL, instructions are provided below.

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Orienting Broadband Sensors

True North (geographic North) is the convention for orienting sensors in what's known as passive experiments, i.e. generally recording earthquakes, as opposed to controlled sources. You must know the declination angle between true North and magnetic North at the station site and you must know how to properly correct for the declination. If you do not know this, find someone who does; otherwise use magnetic North and make sure you write that on the Installation Sheet. (You will use this information later to construct accurate metadata for the station.)

Leveling Broadband Sensors

Fetch the sensor planned for the site and write its serial number on the station's Installation Sheet, preferably in pencil, because if the sensor does not work properly, you will have to try a different one. Loosen the sensor feet (the foot-locking mechanisms may need to be backed off) and shorten the feet (also known as legs) as much as possible. Clean grit off the sensor pad. Place the sensor on the sensor pad and adjust the sensor's position until its orienting keys are precisely aligned.

Interpreting an RT130 Log

RT130 log files are most easily viewed and interpreted with the program LOGPEEK. LOGPEEK is part of the PASSOFT software package.     This figure shows how LOGPEEK looks under normal operation. For more help or detail please see the Help section within LOGPEEK.  


This shows a short summary of what fields are displayed graphically in LOGPEEK and what they mean.

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Programming RT130's

The RT130 can be configured using any PalmOS device that has a serial interface and the program PFC-130, but the PASSCAL Instrument Center exclusively uses and provides Sony Cliés.


The following is an example outline of an RT130 configuration using the PFC-130 program. The outline is intended as a quick reference guide only and is not a substitute for training or reading the official manufacturer's manual. For detailed information on programming the RT130 using PFC-130, consult the manufacturer's RT130 information page and brochure.

PFC-130 Quick Reference Guide to Programming

Note: Items marked with * are information that will be written to the log file, but will not affect the operation of the RT130.