Tectonics of Asia and Waveform Studies of the Velocity and Q Structure of the Mantle

Surface-wave analysis proves to be an effective way of determining focal mechanisms for earthquakes with relatively small magnitudes. By comparing the surface waves of one event to another nearby event, the effects of the epicenter-to-station path can be largely reduced. This is true even when most...

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Bibliographic Details
Main Authors: Sykes,Lynn R, Burdick,Lawrence J
Format: Report
Language:English
Subjects:
ATTENUATION
Central Asia
EARTH MANTLE
EARTHQUAKES
Focal mechanisms
Gazli earthquakes
P waves
PE61102F
Q structure(Seismology)
S waves
SEISMIC WAVES
Seismology
SIBERIA
SURFACE WAVES
WAVE PROPAGATION
WAVEFORMS
WUAFOSR329132
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Summary:Surface-wave analysis proves to be an effective way of determining focal mechanisms for earthquakes with relatively small magnitudes. By comparing the surface waves of one event to another nearby event, the effects of the epicenter-to-station path can be largely reduced. This is true even when most paths cross or lie along zones of complicated deformation. Two events in the northern Arabian Sea have similar mechanisms and can be interpreted as earthquakes along transform features between the Indian and Arabian plates. In recent years, the techniques of time domain waveform synthesis have permitted us to understand much more about seismic sources, about the seismic velocity structure of the earth and about seismic attenuation than ever before. In a second, separate program of study, which is described here, an effort is being made to apply these techniques to solution of the detection, discrimination and yield estimation problems. A variety of investigations have either been completed or are under way which are designed to derive as much information about the earth as possible from seismic body waves.