Variations in regional traveltimes

Crustal Studies Technical Letter 16
In cooperation with the Defense Advanced Research Projects Agency



Precise epicentral location of a seismic event is made difficult by variations in regional traveltimes. A discussion is presented on delays to be expected in the various segments of a generalized travel path of seismic waves. Traveltime variations caused by changes in crustal structure and velocity introduce a major part of the uncertainty in traveltime at both the seismic source and receiver. Consideration of geologic factors that tend to be related to crustal thickness and mantle velocity may permit an estimate of the amount of delay introduced at the source. Delay at the seismic receiving stations can be determined and corrected for by a study of crustal thickness and a calibration of the velocity structure under the stations.
Publication type Report
Publication Subtype USGS Unnumbered Series
Title Variations in regional traveltimes
Series title Crustal Studies Technical Letter
Series number 16
DOI 10.3133/70039540
Year Published 1964
Language English
Publisher U.S. Geological Survey
Publisher location Denver, CO
Contributing office(s) Earthquake Science Center
Description v, 20 p.
Online Only (Y/N) Y
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