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Stress drops and radiated seismic energies of microearthquakes in a South African gold mine
 

Summary: Stress drops and radiated seismic energies of
microearthquakes in a South African gold mine
Takuji Yamada,1,2
James J. Mori,3
Satoshi Ide,2
Rachel E. Abercrombie,1
Hironori Kawakata,4
Masao Nakatani,5
Yoshihisa Iio,3
and Hiroshi Ogasawara4
Received 8 June 2006; revised 12 October 2006; accepted 30 October 2006; published 17 March 2007.
[1] We estimate stress drops and radiated seismic energies of 20 microearthquakes
(0.0 < MW < 1.3) in a South African gold mine to investigate their rupture characteristics
and scaling relationships to large earthquakes. We analyze seismograms of borehole
accelerometers recorded with high sampling rate (15 kHz) within 200 m of the
hypocenters at the depth of 2650 m. The waveform data have very high signal-to-noise
ratio and no significant later phases are observed at all stations. Corner frequencies and
quality factors of the anelastic attenuation Q are estimated from spectra of velocity
seismograms by assuming the omega squared model of Boatwright (1978). We also
investigate moment tensors for double couple solutions and volumetric components from

  

Source: Abercrombie, Rachel E. - Department of Earth Sciences, Boston University

 

Collections: Geosciences