Physics
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..971l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 11, p. 971-974
Physics
16
Earth Crust, Energy Dissipation, San Andreas Fault, Scattering, Seismographs, Seismology, Attenuation, Bandpass Filters, Boreholes, Earthquakes
Scientific paper
A triaxial 10 Hz seismometer at 2.5 km depth in the Cajon Pass borehole near the San Andreas fault in southern California records shear-wave coda motion from small local events for over 20 seconds duration. The passband of recorded seismic motion is 5 Hz to 200 Hz. To measure the rate of coda energy decay as a function of frequency, we filter the vector velocity seisograms of seven events into five octave-wide frequency bands (mean frequencies approximately equals 7, 14, 28, 56 and 112 Hz) and square the filtered seisograms. The observed energy decay in each passband is well approximated by first and second order scattering plus intrinsic attenuation as formulated by Zeng at al. (1991). The fits determine two energy decay parameters expressed as inverse lengths, beta(sub scat) for scattering and beta(sub intr) for absorption. Because the source-receiver distance is less than the thickness of the upper crust and the receiver is at depth, the direct body wave is uncomplicated by refracted energy and/or surface waves and allows accurate recording of coda energy relative to source pulse energy. The coda/source energy ratio directly defines the scattering attentuation parameter b(sub scat) and voids the need for multiple offset observations.
Abercrombie Rachel
Leary Peter
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