Estimation of earthquake source parameters and site response in Anchorage, Alaska from strong-motion network data using generalized inversion method

Details Estimation of earthquake source parameters and site response in Anchorage, Alaska from strong-motion network data using generalized inversion method Estimation of earthquake source parameters and site response in Anchorage, Alaska from strong-motion network data using generalized inversion method

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pepi..137...13d&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 137, Issue 1-4, p. 13-29.

Physics

3

Scientific paper

Generalized inversion of the S-wave amplitude spectra from the strong-motion network data in Anchorage, Alaska, has been analyzed to estimate simultaneously source parameters, site response (SR) and the S-wave attenuation (Qs-1). The data represented 60 earthquakes of magnitudes (ML) from 3.0 to 6.3 in the hypocentral distance range from 30 to 300km. The source term obtained from inversion was analyzed to estimate various source parameters, namely, seismic moment (Mo), seismic energy (Es), corner frequency (fc), apparent stress (σA) and Brune's stress drop (Δσ) for each event. It is shown that Mo and Es varies from 1014 to 2.1×1018Nm and form 5.8×108 to 0.8×1014J, respectively, while Δσ varies from 0.2 to 24MPa. The regressional analysis of the source parameters shows the following: (1) Es/Mo is approximately equal to 1.2×10-5 and (2) Mo is proportional to fc-3. It is also shown that σA and Δσ approximately satisfies the relation, σA=0.23Δσ. The SR values obtained for the Anchorage basin from the above inversion were averaged for two frequency bands, 0.5-2.5 and 3.0-6.3Hz with geometric center frequencies of about 1.0 and 5.0Hz, respectively. The spatial variation of SR at 1.0Hz shows a gradual increase from 1.0 along the foothills of Chugach mountains to 3.5 in the western part of the basin. At 5.0Hz, the trend of the variation of SR values is from north to south. Moreover at 1.0Hz, the above trend of SR values is in agreement with that of shear-wave velocity of the uppermost 30m of the sedimentary formations of the basin. The variation of Qs-1 in the region is found to be 0.0066f-1.2 in the frequency range from 0.25 to 20Hz.

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