Narrow and Broad Region Dispersion of Long-Period Surface Waves

Examples of both narrow and broad region dispersion analysis for long-period surface waves are presented. Narrow region dispersion analysis of Kuriles/Kamchatka earthquake signals recorded at Guam, by means of moving-window maximum entropy spectral analysis, indicates strong multipathing in the 3.0...

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Bibliographic Details
Main Author: Unger, Rudolf
Other Authors: TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
Format: Text
Language:English
Published: 1978
Subjects:
Seismology
*SEISMIC WAVES
ALGORITHMS
EARTHQUAKE WARNING SYSTEMS
GLOBAL
LONG WAVELENGTHS
NUCLEAR EXPLOSION TESTING
RAYLEIGH WAVES
SURFACE WAVES
WAVEFORMS
LPN-VT/8705/B/PMP
Kamchatka
Online Access:http://www.dtic.mil/docs/citations/ADA066735
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA066735
Description
Summary:Examples of both narrow and broad region dispersion analysis for long-period surface waves are presented. Narrow region dispersion analysis of Kuriles/Kamchatka earthquake signals recorded at Guam, by means of moving-window maximum entropy spectral analysis, indicates strong multipathing in the 3.0 to 4.5 km/sec group velocity range, causing poor polarization filter performance. In contrast, between 2.0 and 3.0 km/sec the signals are well defined, resulting in a good polarization filter response. The dispersion for this region seems quite diverse. Broad region dispersion models for the North American and Asian continents were generated using previously reported group velocity data for Nevada Test Site and Eastern Kazakh presumed nuclear explosion signals recorded at world-wide stations. These models facilitate frequency-dependent surface wave magnitude measurement. Report on VELA Network Evaluation and Automatic Processing Research. Sponsored in part by DARPA.

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