Publication Date:
2015-04-01
Description:
The focus of this study is to determine the frequency-dependent quality factor function Q ( f ) for the Caribbean region. The analysis considers the Lg portion of 2685 three-component waveforms. Waveforms are selected from 116 earthquakes that occurred between 2006 and 2013 with moment magnitude M w ranging from 4.6 to 7.0. Spectral amplitudes over 12 distinct passbands from 0.1 to 12.8 Hz are calculated only for waveforms with a signal-to-noise ratio of 5 or better. In the regression model, the vertical component and the geometric mean of two horizontal components are used to estimate Q ( f ). A geometrical spreading function with spectral amplitude decay of R –0.5 is used for distances beyond 100 km. The following quality factor functions for the assumed geometrical spreading are obtained: Q H =310 f 0.54 for the horizontal components, and Q V =235 f 0.65 for the vertical components.
Print ISSN:
0037-1106
Electronic ISSN:
1943-3573
Topics:
Geosciences
,
Physics
