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U.S. GEOLOGICAL SURVEY OFFICE OF EARTHQUAKE STUDIES, 345 MIDDLEFIELD ROAD, MENLO PARK, CALIFORNIA 94025
Abstract
The title of this contribution refers to the high-frequency band-limitation of the radiated field of earthquakes. For close recording distances of
10 km, fmax for California earthquakes is generally found within the very narrow band 10
fmax
20 Hz, without regard to source strength or tectonic setting. Direct evidence for fmax (in the form of shear-wave acceleration spectral amplitudes) and indirect evidence as well (in the form of limiting spectral corner frequencies) have often been taken as manifestations of source properties, barrier end-zones, for example. This study concludes that fmax as actually observed is more likely to be a property of local site conditions, although this does not preclude source-controlled band-limitations at still higher frequencies. Observations of fmax for a single Oroville aftershock show a small but significant site-to-site variation that correlates well with gross surface geology; this variation is "normalized" with a demonstration that fmax for seven of the principal aftershocks (4.0
ML
4.9) at a single station has a distinctly smaller variation. Moreover, there seems to be nothing fundamental about the range 10
fmax
20 Hz so typical for California earthquakes; spectral shear-wave corner frequencies observed at very close distances (
5 km) and for especially competent propagation paths are known to occupy the band 20
fo(S)
200 Hz.
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