Frequency dependent characteristics of coda wave quality factor in central and southcentral Alaska |
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| Authors: | G J Steensma N N Biswas |
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| Institution: | (1) Geophysical Institute, University of Alaska-Fairbanks, 99775-0800 Fairbanks, AK, USA;(2) Present address: Western Geophysical Co. of America, 900 Mohawk Drive, Suite 150, 93309 Bakersfield, CA, USA |
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| Abstract: | Coda wave quality factor (Q
c
) was investigated by using digital data (100 sample sec–1) recorded by a vertical component short-period station installed for this study. The station was located in the greater Fairbanks area in central Alaska. From several hundred earthquakes recorded by this station in about a year, 27 earthquakes were selected for the above study; 7 of these selected earthquakes were located along the Alaska Wadati-Benioff zone (Pacific plate). The other 20 earthquakes were located in the area of intraplate seismicity (North American plate). The data was filtered using 9 pass-bands with center frequency varying from 1.5 Hz to 16 Hz with octave bandwidth. The values ofQ
c
obtained from the coda amplitude decay rates measured on the filtered data after corrections due to the recording instrument and source-receiver separation show appreciable frequency dependence. The value ofQ
c
varies in the range of 253 and 1190 corresponding to the frequency interval from 1.5 Hz to 16 Hz for the study area. This variation is close to that reported by others for the Kanto region of Japan. Moreover, the characteristics ofQ
c
obtained in the present case seem to be independent of epicentral distance and hypocentral depth. |
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| Keywords: | Coda scattering attenuation Alaska |
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