Characteristics of microearthquakes accompanying hydraulic fracturing as determined from studies of spectra of seismic waveforms

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A study of the spectral properties of the waveforms recorded during hydraulic fracturing earthquakes has been carried out to obtain information about the physical dimensions of the earthquakes. We find two types of events. The first type has waveforms with clear P and S arrivals and spectra that are very similar to earthquakes occurring in tectonic regions. These events are interpreted as being due to shear slip along fault planes. The second type of event has waveforms that are similar in many ways to long period earthquakes observed at volcanoes and is called long period. Many waveforms of these events ... continued below

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Pages: 7

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Fehler, M. & Bame, D. March 1, 1985.

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A study of the spectral properties of the waveforms recorded during hydraulic fracturing earthquakes has been carried out to obtain information about the physical dimensions of the earthquakes. We find two types of events. The first type has waveforms with clear P and S arrivals and spectra that are very similar to earthquakes occurring in tectonic regions. These events are interpreted as being due to shear slip along fault planes. The second type of event has waveforms that are similar in many ways to long period earthquakes observed at volcanoes and is called long period. Many waveforms of these events are identical, which implies that these events represent repeated activation of a given source. We propose that the source of these long period events is the sudden opening of a channel that connects two cracks filled with fluid at different pressures. The sizes of the two cracks differ, which causes two or more peaks to appear in the spectra, each peak being associated with one physical dimension of the crack. From the frequencies at which spectral peaks occur, we estimate crack dimensions of between 3 and 22m. 13 refs., 8 figs.

Physical Description

Pages: 7

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NTIS, PC A02/MF A01.

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  • International symposium on geothermal energy, Kailua Kona, HI, USA, 26 Aug 1985

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  • Other: DE85009558
  • Report No.: LA-UR-85-930
  • Report No.: CONF-850801-12
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5535999
  • Archival Resource Key: ark:/67531/metadc1093464

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Office of Scientific & Technical Information Technical Reports

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  • March 1, 1985

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  • Feb. 10, 2018, 10:06 p.m.

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  • May 11, 2018, 12:01 p.m.

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Fehler, M. & Bame, D. Characteristics of microearthquakes accompanying hydraulic fracturing as determined from studies of spectra of seismic waveforms, article, March 1, 1985; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1093464/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.