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Author Hahm, In Kyeong ♦ Kim, Woohan ♦ Lee, Jung Mo ♦ Jeon, Jeong Soo
Source SpringerLink
Content type Text
Publisher Springer-Verlag
File Format PDF
Copyright Year ©2007
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Earth sciences ♦ Geology, hydrology & meteorology
Subject Keyword hypocentral parameters ♦ weighting factor ♦ epicentral distance ♦ take-off angle ♦ Geosciences
Abstract This paper introduces an improved method of determining hypocentral parameters of local earthquakes by applying a weighting factor based on take-off angle at a source. The hypocentral parameters determined by the existing methods contain errors if the true velocity structure is not used, and they are not identical depending on the velocity models used. Variation in the traveltime caused by a focal depth may indicate the degree of focal depth information contained in the data. The degree of information will decrease rapidly as the epicentral distance increases. The take-off angle at the source is related to the epicentral distance. Therefore, a weighting factor representing the degree of focal depth information could be described in terms of the take-off angle at the source. The accuracy of hypocentral parameters, especially the focal depth and the origin time, is improved by applying the take-off angle as the weighting factor and two-point ray tracing to the existing methods. Synthetic traveltime data both with noise and without noise are generated using the two-point ray tracing technique with a model in which velocity structure and hypocentral parameters are known. The effect of the weighting factor is examined by comparing the estimated hypocentral parameters with the true, known values. The computational results show that the focal depth and the origin time estimated by the improved method (MHYPO) in this work are more accurate than those estimated by other existing methods.
ISSN 12264806
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2007-01-01
Publisher Place Berlin, Heidelberg
e-ISSN 15987477
Journal Geosciences Journal
Volume Number 11
Issue Number 1
Page Count 11
Starting Page 39
Ending Page 49


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Source: SpringerLink