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Ground Magnetic Data from within the Long Valley Caldera, California Entry ID: USGS_OFR_2004_1096 |
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Summary
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Abstract:
The past two decades have been a period of unrest for the Long Valley caldera of eastern California. The unrest began in 1978 and continued through late 1999 and included recurring swarms of moderate earthquakes, as well as uplifting of the Resurgent Dome, which has totaled approximately 80 cm. It is believed that the seismicity is accompanied by magmatic intrusion beneath both the Resurgent Dome at a depth of about 7 km; 10 km and the South Moat Seismic Zone (SMSZ) at a depth of about 15 km (Sorey and others, 2003). Seismic surveys within the caldera's topographic boundary have indicated the seismicity beneath the northwest section of the caldera is associated with fluid injection into narrow conduits and fractures (Stroujkova and Malin, 2000). Like the dominant regional structural trend, these conduits run in a northwest-southeast direction and are only expressed at the surface by a slight topographic relief of about 3 m. Merged aeromagnetic data (Roberts and Jachens, 1999) over the caldera show a magnetic low in the west and a high in the east (Figure 3). The western part has been modeled to relate to altered, low-magnetization (about 2.5 km thick) Bishop Tuff beneath the Resurgent Dome, indicating hydrothermal alteration in the west, whereas the high in the east represents the unaltered Bishop Tuff (Williams and others, 1977). The ground magnetic survey was conducted to locate magnetic lows that might indicate altered zones reflecting conduits for hydrothermal fluid flow in the northwest portion of the caldera. [Summary provided by the USGS.] |
Related URL
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Link:
GET DATA
Description: Download Long Valley ground magnetic data. |
Geographic Coverage
| N: 42.51 | S: 32.02 | E: -113.61 | W: -124.9 |
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Data Set Citation
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Dataset Originator/Creator:
E. D. Anderson and C. A. Finn
Dataset Title: Ground Magnetic Data from within the Long Valley Caldera, California Dataset Series Name: Open File Report 2004 Dataset Release Date: 2004 Dataset Publisher: U.S. Geological Survey Data Presentation Form: online files Online Resource: http://pubs.usgs.gov/of/2004/1096/ |
Temporal Coverage
| Start Date: 2003-07-27 |
| Stop Date: 2003-08-01 |
Location Keywords
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CONTINENT
> NORTH AMERICA
> UNITED STATES OF AMERICA
> CALIFORNIA
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Science Keywords
| SOLID EARTH >GEOMAGNETISM >MAGNETIC FIELD >MAGNETIC ANOMALIES [Definition] |
| SOLID EARTH >GEOMAGNETISM >MAGNETIC FIELD [Definition] |
| SOLID EARTH >GEOMAGNETISM >MAGNETIC FIELD >MAGNETIC INTENSITY [Definition] |
| SOLID EARTH >TECTONICS >EARTHQUAKES >EARTHQUAKE MAGNITUDE/INTENSITY [Definition] |
| SOLID EARTH >TECTONICS >EARTHQUAKES >EARTHQUAKE OCCURRENCES [Definition] |
| SOLID EARTH >TECTONICS >EARTHQUAKES >EARTHQUAKE PREDICTIONS [Definition] |
| SOLID EARTH >TECTONICS >PLATE TECTONICS [Definition] |
ISO Topic Category
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GEOSCIENTIFIC INFORMATION
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Platform
| FIELD SURVEYS [Information] |
| MAPS [Information] |
Instrument
| MAGNETOMETERS [Information] |
| GPS >Global Positioning System [Information] |
Keywords
| OFR |
| Open File Report |
| Caldera |
| Ground Magnetics |
| Seismic Surveys |
| Tectonics |
Data Set Progress
| IN WORK |
Originating Center
| USGS |
Data Center
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Publications-Western Region,Geological Division, U.S. Geological Survey, U.S. Department of the Interior
[Information]
Data Center URL: http://geopubs.wr.usgs.gov/
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Distribution
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Distribution_Media:
online
Distribution_Format: ASCII Fees: No fees |
Personnel
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CAROL
A
FINN Role: TECHNICAL CONTACT Phone: 303-236-1345 Fax: 303-236-1229 Email: cfinn at usgs.gov Contact Address: U.S. Geological Survey MS 964 Denver Federal Center City: Denver Province or State: CO Postal Code: 80225 Country: USA |
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ERIC
D.
ANDERSON Role: TECHNICAL CONTACT Phone: 303-236-5652 Email: ericanderson at usgs.gov Contact Address: U.S. Geological Survey, Geology Division Box 25046, MS 964 Denver Federal Center City: Denver Province or State: CO Postal Code: 80225-0046 Country: USA |
Creation and Review Dates
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SERF Creation Date:
2003-08-19
SERF Last Revision Date: 2005-08-02 |
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