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U.S. Geological Survey Open File Report 2010-1321

Documentation for a Web Site to Serve ULF-EM (Ultra-Low Frequency Electromagnetic) Data to the Public

How and the servers that support it retrieve, maintain, and serve data

By Danny A. Neumann, Selwyn McPherson, Simon L. Klemperer, Jonathan M.G. Glen, Darcy K. McPhee, and Karl Kappler

Project Overview

Thumbnail of and link to report PDF (1 MB)

The Stanford Ultra-Low Frequency Electromagnetic (ULF-EM) Monitoring Project is recording naturally varying electromagnetic signals adjacent to active earthquake faults, in an attempt to establish whether there is any variation in these signals associated with earthquakes. Our project is collaborative between Stanford University, the U.S. Geological Survey (USGS), and UC Berkeley. Lead scientists are Simon Klemperer (Stanford University), Jonathan Glen (USGS) and Darcy Karakelian McPhee (USGS).

Our initial sites are in the San Francisco Bay Area, monitoring different strands of the San Andreas fault system, at Stanford University’s Jasper Ridge Biological Preserve (JRSC), Marin Headlands of the Golden Gate National Recreation Area (MHDL), and the UC Berkeley’s Russell Reservation Field Station adjacent to Briones Regional Park (BRIB). In addition, we maintain in conjunction with the Berkeley Seismological Laboratory (BSL) two remote reference stations at the Bear Valley Ranch in Parkfield, Calif., (PKD) and the San Andreas Geophysical Observatory at Hollister, Calif., (SAO). Metadata about our site can be found at Site descriptions can be found at the BSL at, and seismic data can be obtained from the Northern California Earthquake Data Center at

The site allows access to data from the Stanford-USGS sites JRSC, MHDL and BRIB, as well as UC Berkeley sites PKD and SAO.

  • This report is available only on the Web.

For additional information:
Contact Information, Western Region Geology and Geophysics Science Center—Menlo Park
U.S. Geological Survey
345 Middlefield Road, MS-989
Menlo Park, CA 94025-3591

This report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Neumannn, D.A., McPherson, S., Klemperer, S.L., Glen, J.M.G, McPhee, D.K, and Kappler, K., 2010, Documentation for a web site to serve ULF-EM (Ultra-Low Frequency Electromagnetic) data to the public: U.S. Geological Survey Open-File Report 2010-1321, 44 p.




Scripts and Programs

The ulfem-Data Web Interface


three Appendixes

Accessibility FOIA Privacy Policies and Notices

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