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News stories from the PASSCAL archives

Array of Arrays: Elusive ETS in the Cascadia Subduction Zone

ETS, or 'episodic tremor and slip', is a recently discovered phenomenon in seismic research. Similar to earthquakes but much smaller in magnitude, ETS events are associated with the subduction zone of some convergent plate boundaries. One such region, the Cascadia subduction zone under the Puget Sound, is the focus of an experiment by Ken Creager's group at the University of Washington (UW), called Array of Arrays.

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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PIC Workshop for Antelope and its Interfaces with Matlab and Python



Antelope Toolbox for Matlab (8MB) The Python Interface to Antelope (8MB) Automatic Event Location with Antelope (6MB) Generalized Event-driven Processing with Antelope (1MB) Seismic Array Processing with Antelope (1MB)

The motivation for this workshop was born in March of 2009 foreseeing the need for a broader understanding of antelope tools and its interfaces by PASSCAL staff and a group of researchers from New Mexico Tech (NMT).

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Batholiths Onland 2009

In July 2009, several IRIS/PASSCAL scientists assisted with the Batholiths Onland project. This large group effort involved over 50 scientists and grad students, for the purpose of making "a seismic refraction and wide-angle reflection survey across the Coast Mountains batholith of British Columbia, Canada."

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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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New Mexico Tech to Expand PASSCAL Instrument Center

Daniel H. López, president of New Mexico Institute of Mining and Technology (New Mexico Tech) in Socorro, authorized the expansion of the on-campus building that houses the IRIS PASSCAL Instrument Center and the EarthScope Array Operations Facility. The 1300 square foot addition, scheduled for completion in Spring 2009, will primarily provide laboratory and office space for PASSCAL’s recently expanded Polar Program activities supported primarily by the National Science Foundation’s Office of Polar Programs.

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