The Detection and Research of Rayleigh and Love Waves

Phase-matched filters are defined as a class of linear filters in which the Fourier phase of the filter is made equal to that of a given signal. An interative technique is described which can be used to find a phase-matched filter for a particular seismic signal. The process is then applied to digit...

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Bibliographic Details
Main Authors: Herrin, Eugene, Goforth, Tom
Other Authors: SOUTHERN METHODIST UNIV DALLAS TX DALLAS GEOPHYSICAL LAB
Format: Text
Language:English
Published: 1977
Subjects:
Seismology
*SEISMIC WAVES
DIGITAL SYSTEMS
DISPERSION RELATIONS
EARTHQUAKES
GREENLAND SEA
LINEAR FILTERING
RAYLEIGH WAVES
SEISMIC DETECTION
SIGNAL PROCESSING
SIGNAL TO NOISE RATIO
TEXAS
UNDERGROUND EXPLOSIONS
LOVE WAVES
NOVAYA ZEMLYA
Greenland
Greenland Sea
Novaya Zemlya
Online Access:http://www.dtic.mil/docs/citations/ADA038078
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA038078
Description
Summary:Phase-matched filters are defined as a class of linear filters in which the Fourier phase of the filter is made equal to that of a given signal. An interative technique is described which can be used to find a phase-matched filter for a particular seismic signal. The process is then applied to digital records of Rayleigh waves from a synthetic source with propagation across 55 deg. of continental path, an earthquake in the Greeland Sea Recorded in Texas, and a nuclear explosion in Novaya Zemlya recorded in New Mexico. Application of the filter allows multiple arrivals to be identified and removed and allows recovery of the complex spectrum of the primary wave train along with its apparent group velocity dispersion curve. The amplitude spectrum of the primary signal obtained by this linear spectrum of the primary signal obtained by this linear process is not contaminated by interference from multipath arrivals. The filtering process also provides significant improvement in signal-to-noise ratio; greater than factor of four for the Greenland Sea and Novaya Zemlya events. Sponsored in part by DARPA.

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