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

Cables for Multi-Channel Dataloggers

  Channel Type Number of Takeouts Takeout Spacing Total Cable Length Inter Connectable Geode 24ch Single/3-Component 24

Geode Datalogger


System consists of one 24-channel Geodes, with two built-in high-speed connections to interface with other Geodes and a PC-compatible controller or the StrataVisor NZ seismograph.

Suitable for reflection, refraction, downhole, crosshole, surface wave, and tomography surveys, and seismic monitoring.

PH5 vs SEG-Y: Archival Data Format Comparison

PH5, clearly a better choice as an archival data format.


Field Staffing Policy

August 23, 2006 PIC staffing support for field operations

PIs may request PASSCAL Instrument Center (PIC) staff to support field operations. The PIC will do its best to provide the requested support given the available resources at the time of the field campaign. The PIC also reserves the right not to provide field support if the field area is deemed to dangerous; in such a case the PIC will do all that is possible to ensure the success of the experiment. The PIC strongly recommends that all PIs take advantage of this resource recognizing the expertise that the PIC staff offers field operations. Any individual PIC staff will not be required to spend more than four (4) weeks supporting a field campaign unless special circumstances exist and all parties, PI, PIC management and PIC field personnel, have agreed. For field campaigns that last longer than four (4) weeks PIs can opt to have rotating shifts of PIC staff support.


November 1, 2017
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Instrument Use Agreement

Principal Investigator: _________________________


Experiment: ________________


Portable field recording equipment, field computers and other associated equipment purchased by the PASSCAL Program are being made available to the experiment referenced above. In return for the use of this equipment, the Principal Investigator (PI) is expected to adhere to the following conditions with respect to the operation, care and disposition of the equipment and data obtained:

1. Copies of all data sets acquired with the instruments will be made available to the IRIS Data Management Center in accordance with the PASSCAL Data Delivery Policy.

Active Seismic Sources Committee Charge

Charge of the Advisory Committee on PASSCAL Active Seismic Sources

The Incorporated Research Institutes for Seismology (IRIS) 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 IRIS community relies on “active” seismic sources in which the researchers generate seismic signals using a variety of mechanical and chemical sources.

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Broadband Vault Construction


Download Diagram of Vault (jpg)

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.

Station Siting Considerations

April 20th, 2009

These documents address things to consider regarding Station Siting Location/Access, Cultural Noise, and Suggested Materials.

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Seismometers are instruments that measure and record motions of the ground, including those of seismic waves generated by earthquakes, nuclear explosions, and other seismic sources. Records of seismic waves allow seismologists to map the interior of the Earth, and locate and measure the size of these different sources.

Seismograph is another Greek term from Seism - "the shakes" and Grapho - "I draw". It is often used to mean seismometer, though it is more applicable to the older instruments in which the measuring and recording of ground motion were combined than to modern systems, in which these functions are separated. Both types provide a continuous record of ground motion; this distinguishes them from seismoscopes, which merely indicate that motion has occurred, perhaps with some simple measure of how large it was.

The PASSCAL Instrument Center supports the following types of seismometers:

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