Propagation Path Effects for Rayleigh and Love Waves (Surface Wave Studies of the Bering Sea and Alaska Area)

The area of the Bering Sea and Alaska was studied in terms of shear- velocity, density and compressional-velocity structure by applying a generalized linear inversion method to fundamental-mode Rayleigh-wave group-velocity dispersion relationships in the period range from 10 to 100 sec. Group veloci...

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Bibliographic Details
Main Authors: Herrin, Eugene, Goforth, Tom, Jin, Doo-Jung
Other Authors: SOUTHERN METHODIST UNIV DALLAS TX DALLAS GEOPHYSICAL LAB
Format: Text
Language:English
Published: 1979
Subjects:
Seismology
*SEISMIC WAVES
ALASKA
BERING SEA
MATCHED FILTERS
PHASE STUDIES
RAYLEIGH WAVES
SIGNAL PROCESSING
SIGNAL TO NOISE RATIO
SURFACE WAVES
TIME SERIES ANALYSIS
WAVE PROPAGATION
LOVE WAVES
Bering Sea
Bering Shelf
Alaska
Online Access:http://www.dtic.mil/docs/citations/ADA148959
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA148959
Description
Summary:The area of the Bering Sea and Alaska was studied in terms of shear- velocity, density and compressional-velocity structure by applying a generalized linear inversion method to fundamental-mode Rayleigh-wave group-velocity dispersion relationships in the period range from 10 to 100 sec. Group velocity dispersion relationships in the area were obtained by applying the phase-matched filtering technique to digitally recorded surface-wave data. A new exact analytical method for the computation of Rayleigh-wave phase-velocity partial derivatives with respect to Earth parameters was formulated. With the phase- velocity partial derivatives determined, the group velocity partial derivatives were computed by use of the fast and accurate method of Rodi, and were successfully incorporated into a generalized linear inversion method. In continental Alaska, the crustal thickness is 43 +or- km, and a low velocity zone extendes from a depth of about 113 km to about 213 km. In the Bering Shelf region, the depth to the Mohorovicic discountinuity is 28 +or- 4 km, and a low velocity zone ranges in depth from about 108 km to about 213 km. In the Aleutian Basin, the thickness of the crust is 18 +or- 4 km, and a low velocity zone extends from a depth of about 60 km to about 220 km.

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