Excitation of short-period body-waves by great earthquakes

Details Excitation of short-period body-waves by great earthquakes Excitation of short-period body-waves by great earthquakes

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...37..108k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 37, Issue 2-3, p. 108-123.

Physics

9

Scientific paper

Short-period seismograms from large earthquakes are generally complex and are hard to Fourier-analyze. An innovation of spectral analysis has been made for WWSSN short-period seismograms. The parameters necessary for the analysis are: dominant frequency ƒ;0 maximum amplitude Amax; and a characteristic duration σ of complicated wave-packets. Spectrum of short-period seismograms, Y(ƒ;), is shown to be approximated as Y(ƒ;)=1.07√σ/ƒ;0Amax The spectrum, after correcting for the effects of geometrical spreading, unelastic attenuation instrumental response, and crustal magnifications, is used to retrieve a short-period seismic moment M1 of earthquake sources. The method has been applied to more than 900 short-period seismograms from 79 large earthquakes throughout the world. These earthquakes cover the seismic moment, M0, from 7.5 × 1029 to 7.5 × 1024 dyne.cm. M1 would not be saturated in this range, although body-wave magnitude usually is. A relation of M0 ∞ M12 is obtained for the present data set. A relation between M1 and redetermined body-wave magnitude m*b is also shown log M1=1.24 m *b+17.9 where mb* is obtained from maximum amplitudes of P-wavetrains.
The analysis method is based on an extension of algorithm of earthquake magnitude determination, however, it has a potential beyond the body-wave magnitude. As M1 is related closely to the source excitation of short-period seismic waves, it is one of the key parameters in understanding the fracture mechanisms of irregular faults.

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