碩士 / 國立臺灣海洋大學 / 應用地球科學研究所 / 96 / The most fault structure of Taiwan are locate onshore. There are less study of the transition zone between the land and sea of Taiwan. By the supporting of the“Big Taipei area prevent disaster project ”of Central Geological Survey, MOEA, We present the more detail of geodynamics structures in our study area by using high resolution geophysics data and other project of geological drilling data, heat flew detecting, earthquake monitoring and hight-resolution airborne LiDAR images.
The Chinsan fault is major fault structure coming from early Miocene in this area. Kanchiau / Keelung / Taipei / Wunzaikeng fault are along NE-SW strike direction. A series of onshore thrust fault system is due to the collision and compression stress of the Luzon arc of the east Taiwan, and the deformation front in back of the fault are caused. This is maybe the reason of early orogeny of Taiwan occurred. The fault plan distance may from hundreds to three thousand meters.
In late Miocene, Due to the migration of forearc collision to the southward, the subduction zone may extend westward beneath the Ryukyu arc. This may cause the mountains overturned in northeast part of Taiwan along the subduction direction, coming up the dent of mountains and extension of Okinawa Trough. If this model is acceptable, the fault of north Taiwan is just from compress stress to the extension stress and from thrust fault to normal fault. There is no large river system northward the sea in north Taiwan, the sediment is too less to overlaps the trace of fault activity, and the depth continental shelf is only 100 meters, it is too easy to be effected by the marine transgression and regression. It finally forms the submarine valley and garben. The forearc collision continuously, the radial and transverse stress cause the strike slip fault and flower structure.
The Datun Mountains and the Keelung volcano are extension by the fault, It is the forming reason of the submarine igneous bodies and three of north igneous islands and Diaoyu island, but there may have no natural volcanic/fault calamity recently in this area because of the lithological characters and deeply of subduction zone.
In this study, we have compiled the refraction and reflection seismic data with Ocean Bottom Seismometer (OBS), Multi Channel Seismic (MCS) and Chirp Sonar collected by Ocean Research vessel at Chinsan nearshore area during 2005-2006. We analyzing the fault structure system between the land and sea area to advanced realizing the fault and linear structure system in Big Taipei area by using those data. Moreover, we also compare with the previous study of onshore fault system to adjust the fault location of digital gradient model. We using those new integrate data to understand the relation between the fault and tectonic structure especially in northern nearshore Taiwan. We hope it can prepare against natural calamity of fault / volcanic of Big Taipei area in the future.
| Identifer | oai:union.ndltd.org:TW/096NTOU5135001 |
| Date | January 2007 |
| Creators | Wen-Ling Huang, 黃雯苓 |
| Contributors | Chao-Shing Lee, 李昭興 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 90 |
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