碩士 / 國立臺灣海洋大學 / 應用地球科學研究所 / 99 / Taiwan is in the plate collision margin with Eurasian Plate and Philippine Sea Plate. On 26 December 2006 (12:26:21.0 UTC and 12:34:15.1 UTC), two closely ML 7.0 earthquakes which as known as the Pingtung earthquake doublets occurred offshore southern Taiwan. About two fault plane solutions and down dip directions were normal fault toward east and strike-slip fault toward west respectively. The information from aftershocks implies not only related messages of the main shock, but also the rupture plane and tectonic structure in source area. However, owing to the poor station azimuthal coverage and the lack of information from seismicity in this area, the precise locations of this aftershock sequence are not definite. A linear array has been set on land while the Pingtung earthquake doublets occurred and well recorded the main shocks and aftershocks. 11 ocean bottom seismometers were deployed within 24 hours after the doublet events and recorded the aftershocks more than one week continuously. These onshore and offshore data provide a good opportunity for investigating tectonic structure and plate movement in southern Taiwan where is in the boundary between the Philippine Sea Plate, South China Sea Plate and Eurasian Plate. The aim of this study is to probe into the complicated structure in source area and try to define the fault plane by combining onshore and offshore data for doing aftershock relocations. The onshore broadband linear array provides very high quality records and the offshore data recorded by ocean bottom seismometers which enable the intra-network recording constrains the uncertainty of relocations. Compare the results of this study with the report of aftershock distributions from Central Weather Bureau, the relocations of this study are more convergent and close to source area. From three aftershock location profiles along 21.6°N, 21.8°N and 22.0°N, there are two down dip planes toward east and west respectively could be recognized. Compare fault plane location and fault dip angle of mainshocks to three profiles, two down dip planes toward east and west completely close to the location and dip angle of mainshocks.
| Identifer | oai:union.ndltd.org:TW/099NTOU5135001 |
| Date | January 2011 |
| Creators | Sheng-He Wang, 王聖賀 |
| Contributors | Yi-Ling Huang, 黃怡陵 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 89 |
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