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

Polar Programs


PASSCAL currently supports approximately 60 experiments per year worldwide, with 5-10% currently funded by the National Science Foundation (NSF) Office of Polar Programs (OPP). Polar projects commonly require a level of support that is several times that of seismic experiments in less demanding environments inclusive of very remote deployments (e.g. Tibet). In order to ensure OPP funded Antarctic projects the highest level of success, we have established a PASSCAL Polar Program and have secured funds from OPP to support new and ongoing experiments in Antarctica.

The primary focus of PASSCAL’s Polar support efforts are:

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Restoring a Clie


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Broadband Vault Construction (Manual)

 Broadband Vault Construction

Diagram of Vault

Construction of the vault for broadband seismometers has a direct impact on data quality. Before construction can begin there are two other important considerations as well; location, and setting. A short discussion of these topics precedes the construction details because you should really pick the right site before going to all the work of building a vault. It takes a long time to find good sites which balance the competing requirements of low noise, access, security, position within the array, power, permission, etc. Finding one site per day is fairly productive.



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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 - Python: We no longer support Python version lower than 3.9.

Note - MacOS: We no longer support MacOS version lower than 12 (Monterey).

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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.)