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EARTH RESOURCES LABORATORY DEPARTMENT OF EARTH, ATMOSPHERIC, AND PLANETARY SCIENCES MASSACHUSETTS INSTITUTE OF TECHNOLOGY, CAMBRIDGE, MASSACHUSETTS 02139
Abstract
Seismic wave attenuation was measured in New England from the time domain decay of coda wave amplitudes on narrow bandpass-filtered seismograms of local earthquakes. The frequency band of interest was 0.75 to 10 Hz. Qc(f) was found to increase with frequency across this band, but there was also a difference between the Qc(f) values for short (t < 100 sec) and long (t > 100 sec) lapse times of coda wave propagation. For the short-lapse time data, corresponding to wave paths primarily in the upper crust, Qc(f) increases from 400 at 3 Hz to 1300 at 10 Hz. For the large-lapse time data, corresponding to wave paths in the lower crust and upper mantle, Qc(f) was found to vary from 660 at 1 Hz to 1500 at 10 Hz. If we interpret this dataset in terms of a model incorporating both scattering and anelastic attenuation, we find that the mean free path of seismic waves over this frequency band is 80 km for short-lapse times, and 400 km for long-lapse times. If we assume that scattering is entirely responsible for the observed attenuation, we find that the minimum mean free path for short-lapse times is about 75 km over all frequencies, whereas for long-lapse times, the minimum mean free path decreases from 400 km at 0.75 Hz to 90 km at 10 Hz.
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