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GPS Rollover: Potential Data Logger Performance & Timing Issue

Late 2018 PASSCAL learned of a GPS week rollover event that can affect data logger performance and timing. PASSCAL has acquired a GNSS signal generator that can emulate GPS satellite signals. This satellite emulator allows us to test PASSCAL equipment that relies on GPS timing and to determine how equipment will handle the GPS rollover event. To date, we have determined that some models of GPS engines are affected by the rollover. How the rollover errors manifest is dependent on the data logger’s model and firmware version of the GPS engine.

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Employment Opportunity at IRIS PASSCAL: Staff Scientist/Magnetotellurics Specialist

Staff Scientist/Magnetotellurics Specialist

Institution: IRIS PASSCAL
Open Until: 2019-01-31

JOB DUTIES:
Core responsibility is to support magnetotelluric equipment pool at IRIS/ PASSCAL. Support will include: equipment testing and maintenance; coordinating equipment use; data archiving; user training and fieldwork. The Magnetotelluric Specialist will also be responsible for developing training and use documentation emphasizing best practices.

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Employment Opportunity at IRIS PASSCAL: Systems Specialist

​Systems Specialist

JOB DUTIES:

Computer and network systems administration. Provides professional technical support services to facility staff and users. Install, configure, and troubleshoot computer hardware, software, systems, networks and printers. Provide technical support across the facility. Repair and replace equipment as necessary. Assist system Administrator in server maintenance, web programming, and client/ server-side scripting.

 

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Important Hardware/Software Notes for Researchers Using PASSCAL Equipment

This page includes important Hardware/Software Notes for Researchers Using PASSCAL Equipment. January 17, 2019: GPS Rollover

Late 2018 PASSCAL learned of a GPS week rollover event that can affect data logger performance and timing. PASSCAL has acquired a GNSS signal generator that can emulate GPS satellite signals. This satellite emulator allows us to test PASSCAL equipment that relies on GPS timing and to determine how equipment will handle the GPS rollover event. To date, we have determined that some models of GPS engines are affected by the rollover. How the rollover errors manifest is dependent on the data logger’s model and firmware version of the GPS engine.

PASSCAL Announces Software release: Nexus, a simple tool for creating SEED meta-data.

PASSCAL is pleased to announce the release of Nexus, a simple tool for creating SEED meta-data.

Nexus is a software tool with a graphical interface that allows users to quickly and easily create and modify SEED meta-data. It outputs StationXML, the recently adopted replacement format for Dataless SEED. Nexus greatly simplifies preparing data for archival at the DMC. 

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Three-component Node Procurement Update

As a response to the seismological community's desire to deploy a larger number of 3-component nodal seismic systems, the IRIS PASSCAL standing committee has guided IRIS management to procure more nodes for the PASSCAL pool. IRIS already has 73 Fairfield ZLAND 3-component 5Hz nodes in the pool and these have been subscribed for more than 2 years out. We have now begun the procurement of another 460 Fairfield nodes for general PASSCAL pool use. We expect to receive these new nodes in the fall of 2018. The new nodes should be ready for general pool usage starting in February, 2019 after evaluation and acceptance is complete (bringing the general node pool to 533 units). Please feel free to include the new nodes in instrument requests for experiments with start dates after February 2019.

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IRIS PASSCAL Data Policy Update

IRIS/PASSCAL has updated our Data Policy. The new Policy, which was published on November 1, 2017,  can be perused here. It details the archiving requirements for data collected with IRIS PASSCAL equipment through the PASSCAL Instrument Center (PIC)

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TA Installation in Alaska Now Complete

After covering the lower 48 United States from coast to coast with a grid of nearly 1700 sites, the last seismic station of the EarthScope Transportable Array has finally been installed in Alaska. IRIS has commemorated the event with a post titled "EarthScope’s Transportable Array Spans Alaska, the Last Frontier." The IRIS article includes a detailed map of the Alaska TA stations, highlighting the location of the final station A19K. 

Tutorial on PASSCAL's New Instrument Request Form and PI Home Page

In June 2016, PASSCAL implemented a new version of the Instrument Scheduling Database.

This tutorial shows Principal Investigators how to request an account, how to log in, how to use the PI Home Page, and how to submit a new and/or modify an existing Instrument Request.

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