P- and S- wave tomography of the crust and uppermost mantle in China and surrounding areas
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2005.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2006
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| Online Access: | http://hdl.handle.net/1721.1/33172 |
| _version_ | 1811093461288353792 |
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| author | Sun, Youshun, 1970- |
| author2 | M Nafi Toksöz. |
| author_facet | M Nafi Toksöz. Sun, Youshun, 1970- |
| author_sort | Sun, Youshun, 1970- |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2005. |
| first_indexed | 2024-09-23T15:45:33Z |
| format | Thesis |
| id | mit-1721.1/33172 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T15:45:33Z |
| publishDate | 2006 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/331722019-04-12T22:06:47Z P- and S- wave tomography of the crust and uppermost mantle in China and surrounding areas P-wave and S-wave tomography of the crust and uppermost mantle in China and surrounding areas Sun, Youshun, 1970- M Nafi Toksöz. Massachusetts Institute of Technology. Dept. of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology. Dept. of Earth, Atmospheric, and Planetary Sciences. Earth, Atmospheric, and Planetary Sciences. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2005. This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections. Includes bibliographical references. This thesis involves inverting the seismic structure of the crust and uppermost mantle in China from the P- and S-wave travel-time tomography. The main contributions of this research are: 1) introducing the adaptive moving window method to obtain 2338 1D P and S models in China; 2) introducing a tomographic method to perform the 3D body wave travel-time tomography with the Moho discontinuity included. Both horizontal and vertical resolutions are highly controlled and smooth transitions among adjacent locations are guaranteed in the final models. To achieve these objectives, the Monte-Carlo (random search) method and the Gauss-Newton method are applied iteratively to find the nonlinear least square solutions and to optimize the models in the crust and uppermost mantle. The models we obtained provide accurate travel-time calculation, ground-truth event relocation and seismogram fittings. These models can therefore be applied to reliable earthquake location. Geological, geodynamic, and volcanic implications of our models are discussed in this thesis. Our tomographic models provide new insights into the geological structure and tectonics of the region, such as lithological variations and large fault zones across the major geological terranes. (cont.) Compared with previous tomographic studies, we have used a larger, higher quality data set and applied an updated tomographic method to take into account the effects of the complex Moho geometry in this region. Our results cast a new light over the complex structure and seismotectonics of China and surrounding areas. by Youshun Sun. Ph.D. 2006-06-20T12:53:28Z 2006-06-20T12:53:28Z 2005 2005 Thesis http://hdl.handle.net/1721.1/33172 65168221 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 314 leaves 73002625 bytes 73004015 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Earth, Atmospheric, and Planetary Sciences. Sun, Youshun, 1970- P- and S- wave tomography of the crust and uppermost mantle in China and surrounding areas |
| title | P- and S- wave tomography of the crust and uppermost mantle in China and surrounding areas |
| title_full | P- and S- wave tomography of the crust and uppermost mantle in China and surrounding areas |
| title_fullStr | P- and S- wave tomography of the crust and uppermost mantle in China and surrounding areas |
| title_full_unstemmed | P- and S- wave tomography of the crust and uppermost mantle in China and surrounding areas |
| title_short | P- and S- wave tomography of the crust and uppermost mantle in China and surrounding areas |
| title_sort | p and s wave tomography of the crust and uppermost mantle in china and surrounding areas |
| topic | Earth, Atmospheric, and Planetary Sciences. |
| url | http://hdl.handle.net/1721.1/33172 |
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