Earthquake monitoring at the Cerro Prieto geothermal field

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A three-week study in spring 1978 revealed more moderate earthquake activity (one or two events/day, M/sub L/ greater than or equal to 1) in the Cerro Prieto production zone. Plotting these events on a Wadati diagram we estimated an 0.4 Poisson's ratio for the upper 1 to 2 km of the field. The events were centered near the western edge of the production zone, near well M-6, and indicated strikeslip movement on north-south faults. To monitor the earthquake activity and propagation characteristics within the production zone, a five-station, semi-permanent array was put into operation in September 1979. The stations are ... continued below

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Pages: 6

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Majer, E.L. & McEvilly, T.V. February 1, 1980.

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Description

A three-week study in spring 1978 revealed more moderate earthquake activity (one or two events/day, M/sub L/ greater than or equal to 1) in the Cerro Prieto production zone. Plotting these events on a Wadati diagram we estimated an 0.4 Poisson's ratio for the upper 1 to 2 km of the field. The events were centered near the western edge of the production zone, near well M-6, and indicated strikeslip movement on north-south faults. To monitor the earthquake activity and propagation characteristics within the production zone, a five-station, semi-permanent array was put into operation in September 1979. The stations are closely spaced (1 to 2 km), surrounding a central station at M-6. Each station consists of a three-component 4.5-Hz geophone in a 100-m well connected to a 12-bit triggered-digital-cassette recorder. Although each station operates independently, they are interconnected via a hard-wire link to a central site. The purpose of this link is twofold: first, to allow telemetry of any selected station to the central site for visual monitoring; second, to provide an automatic daily time calibration to keep inter-station errors to less than 5 ms. The data from these stations will be used to monitor earthquake activity and wave propagation characteristics associated with fluid withdrawal and/or injection in the geothermal reservoir.

Physical Description

Pages: 6

Notes

NTIS, PC A02/MF A01.

Source

  • 2. symposium on the Cerro Prieto Geothermal Field, Baja California, Mexico, 17 Oct 1979

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  • Report No.: LBL-9550
  • Report No.: CONF-7910166-3
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 5321796
  • Archival Resource Key: ark:/67531/metadc1071778

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • February 1, 1980

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 28, 2018, 12:59 p.m.

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Majer, E.L. & McEvilly, T.V. Earthquake monitoring at the Cerro Prieto geothermal field, article, February 1, 1980; United States. (digital.library.unt.edu/ark:/67531/metadc1071778/: accessed May 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.