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Article |
Geophysical Institute
University of Alaska
Fairbanks
Fairbanks, Alaska 99775
(U. D., A. M., N. B.)
University of New York
Buffalo, New York 14260
(A.
P.)
Alaska Department of Geology and Geophysical
Surveys
Fairbanks, Alaska 99709
(R. C.)
The generalized data inversion method has been used to estimate the spatial
variation of site response (SR) in the Anchorage basin in south-central
Alaska. The data analyzed represents weak motion of the horizontal components
of S waves for local earthquakes. They were recorded by a temporary
portable 22-station network (IRIS-PASSCAL equipment) that was operated for
about six months. Setting the path effect from independent sources, the
inversion of the data was carried out to determine SR. The SR values thus
obtained were averaged (logarithmically) for two frequency bands, namely, a
low frequency band (LFB) and a high frequency band (HFB) from 0.5 to 2.5 Hz
and 3.0 to 7.0 Hz, respectively, with center frequencies of about 1.0 Hz and
5.0 Hz. In LFB, SR increases from 1.0 along the foothills of Chugach Mountains
in the east to about 3.5 in the west in and around Campbell Lake and
Government Hill. The areas with SR > 3.0 are associated with extensive
ground failure during the Prince William Sound earthquake
(Mw = 9.2) of 1964. In HFB, there are two small areas
adjoining Tumagain Arm in the southern side of Anchorage with SR greater than
3.0. A comparison of the SR values obtained from the inversion with those
reported by others for standard spectral ratio (SSR) and horizontal to
vertical spectral ratio (HVR) showed (1:1) correspondence with the values of
SSR but larger HVR values by a factor of about 2. Areas of soil class D in the
study area are characterized by SR > 2.0, while those in C are
characterized by SR 
2.0 in LFB, but soil class and SR lack correlation in
HFB.
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