Determination of S-wave site response in Anchorage, Alaska in the 1-9 Hz frequency band

--Site response was estimated at 19 sites in the Anchorage basin in south-central Alaska, using 15 local earthquakes recorded with good signal-to-noise ratio by a temporary weak motion network. The receiver-function-type horizontal-to-vertical spectral ratios (HVSR) were computed at 1-9 Hz frequency...

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Bibliographic Details
Published in:Pure and applied geophysics 2002-09, Vol.159 (11-12), p.2673-2698
Main Authors: SANKAR KUMAR NATH, BISWAS, Nirendra N, DRAVINSKI, Marijan, PAPAGEORGIOU, Apostolos S
Format: Article
Language:English
Subjects:
Anchorages
Earth sciences
Earth, ocean, space
Earthquakes
Earthquakes, seismology
Exact sciences and technology
Failure
Foothills
Frequency bands
Geophysics
Glacial deposits
Internal geophysics
Mountains
Networks
Plate tectonics
Seismic activity
Seismic phenomena
Seismology
Signal to noise ratio
Wave velocity
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Summary:--Site response was estimated at 19 sites in the Anchorage basin in south-central Alaska, using 15 local earthquakes recorded with good signal-to-noise ratio by a temporary weak motion network. The receiver-function-type horizontal-to-vertical spectral ratios (HVSR) were computed at 1-9 Hz frequency band and the resulting HVSR contour maps at 1, 5 and 9 Hz are presented here. The spatial site response distribution shows considerable variation from the foothills of the Chugach Mountains in the east to the western part of Anchorage. The site response increases by a factor of 3 and 3.5 at 1 and 5 Hz, respectively, from the area of older glacial deposits in the eastern part of the city to the area occupied by the Bootlegger Cove formation, particularly in the section adjoining Knik Arm. At 9 Hz, the variation of HVSR from the east to the west is smaller, approximately by a factor of 2. Moreover, the trend of the HVSR variation at 1 and 5 Hz shows good correlation with that of the soil class obtained from surface measurements of S-wave velocity in the 0-30m depth range and available results on ground failure susceptibility of Anchorage.[PUBLICATION ABSTRACT]
ISSN:0033-4553
1420-9136
DOI:10.1007/s00024-002-8753-4