NDLI: Earthquake location in transversely isotropic media with a tilted symmetry axis

Content Provider	Springer Nature Link
Author	Zhao, Aihua Ding, Zhifeng
Copyright Year	2008
Abstract	The conventional intersection method for earthquake location in isotropic media is developed in the case of transversely isotropic media with a tilted symmetry axis (TTI media). The hypocenter is determined using its loci, which are calculated through a minimum travel time tree algorithm for ray tracing in TTI media. There are no restrictions on the structural complexity of the model or on the anisotropy strength of the medium. The location method is validated by its application to determine the hypocenter and origin time of an event in a complex TTI structure, in accordance with four hypotheses or study cases: (a) accurate model and arrival times, (b) perturbed model with randomly variable elastic parameter, (c) noisy arrival time data, and (d) incomplete set of observations from the seismic stations. Furthermore, several numerical tests demonstrate that the orientation of the symmetry axis has a significant effect on the hypocenter location when the seismic anisotropy is not very weak. Moreover, if the hypocentral determination is based on an isotropic reference model while the real medium is anisotropic, the resultant location errors can be considerable even though the anisotropy strength does not exceed 6.10%.
Starting Page	301
Ending Page	311
Page Count	11
File Format	PDF
ISSN	13834649
Journal	Journal of Seismology
Volume Number	13
Issue Number	2
e-ISSN	1573157X
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-09-03
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	TTI media Minimum travel time tree algorithm Earthquake location Geotechnical Engineering Hydrogeology Structural Geology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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