碩士 / 國立中央大學 / 地球物理研究所 / 99 / We use a grid-based moment tensor (GridMT) inversion technique and broadband continuous recordings to real-time monitor the earthquakes occurred in the offshore northeast Taiwan. The moment tensor inversion technique and a grid search scheme are applied to obtain the information of source parameters, including the hypocenter, moment magnitude, and focal mechanism. In Taiwan, the routine moment tensor solutions are reported by CWB(Central Weather Bureau) and IES which both require some lag time for the information on event time and location before performing the CMT(Centroid Moment Tensor) analysis. By using the Grid-based moment tensor inversion technique, the event location and focal mechanism could be obtained simultaneously within about two minutes after the occurrence of the earthquake. This inversion procedure is based on a 1-D Green’s functions database calculated with the frequency-wavenumber (FK) method. The offshore of northeast Taiwan has been taken into account as our first test area which covers the region of 121.5°E to 123°E, 23.5°N to 25°N, and the depth to 136 km. A 3-D grid system is set in this study area with average grid size of 10 x 10 x 10 km3. We compare our results with the BATS CMT solution obtained for the past earthquakes occurred from 2006 to 2010. We also compare the occurred time detected by GridMT with the CWB earthquake reports. The results indicate that the grid-based moment tensor inversion system is efficient and realizable that can be applied to real-time monitor the local seismic activity. Our long-term goal is to launch the GridMT technique with fully 3-D Green’s functions for the whole Taiwan in the future.
| Identifer | oai:union.ndltd.org:TW/099NCU05134007 |
| Date | January 2011 |
| Creators | Hui-Wen Cneng, 鄭惠文 |
| Contributors | Shiann-Jong Lee, Kuo-Fong Ma, 李憲忠, 馬國鳳 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 111 |
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