Determination and interpretation of earthquake source locations in Sichuan Province, China
Name
50398696-MIT.pdf
Description
Full printable version
Size
14.47 MB
Format
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Checksum (MD5)
20eb4dcd0a7604982bf3a85a840bf44f
Author(s)
Sun, Youshun, 1970-
Advisor(s)
M. Nafi Toksöz and F. Dale Morgan.
Date Issued
2001
Publisher
Massachusetts Institute of Technology
Abstract
This thesis involves locating and interpreting earthquakes from the Sichuan Province, China. The main contributions of this research are: successfully fitting the travel time data of three explosions to a two-layer crust model; and the improvement in locating earthquakes. To achieve these objectives, the Gauss-Newton method is applied iteratively to find the nonlinear least squares solution. The Monte Carlo method and the Gauss- Newton method were jointly used to locate events and simultaneously optimize the crust model. The iterative station correction method is adopted to compensate the incorrectness of the velocity model and to improve the event locations. The joint master event method can improve the location of the events near the master event. The modified Hypoinverse not only can locate events based on the spherical crust model, but can also jointly improve the crust model used. A three-dimensional crust model is next to be optimized and to improve event locations further. We also present geological interpretation about earthquake locations in Sichuan and their tectonic implications.
Description
Thesis (S.M. in Earth and Planetary Sciences)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2001.
Includes bibliographical references (leaves 149-153).
Subjects
Earth, Atmospheric, and Planetary Sciences.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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