RE-COGNITION OF THE NEOTECTONICS AND ACTIVITIES OF THE YINGKOU-WEIFANG FAULT ZONE |
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| Authors: | GAO Zhan-wu XU Jie ZHAO Tie-hu ZHANG Jin JI Feng-ju ZHOU Ben-gang |
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| Institution: | 1. China Earthquake Disaster Prevention Center, Beijing 100029, China;2. Institute of Geology, China Earthquake Administration, Beijing 100029, China;3. Qingdao Institute of Marine Geology, CGS 266071, China;4. The Institute of Geology, CAGS, Beijing 100037, China |
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| Abstract: | The Yingkou-Weifang fault zone (YWFZ) is the part of the Tanlu fault zone across the Bohai Sea, and is also an important part of the tectonics of the eastern Bohai Bay Basin. Many studies have been carried out on the neo-tectonics and activities of the YWFZ in recent years. In this paper, the neo-tectonics and activities of the YWFZ, and other related issues were studied again, based on our previous work and results of other researchers. The neo-tectonic movement in the Bohai Sea area began in the late Miocene (12~10Ma BP), which originated from the local crust horizontal movement, the tectonic stress field is characterized by NEE-SWW and near E-W horizontal compression. The neo-tectonics of the YWFZ is represented mainly by Neogene-Quaternary deformation, due to rejuvenation of Paleogene faults. Many faults have developed. The neo-tectonics and activities of YWFZ have characteristics of segmentation and weakening, because of the development of the NE-trending Northwest Miao Island-the Yellow River Estuary fault zone, which crosses the YWFZ. Earthquakes in the east of Bohai Sea are distributed along the Northwest Miao Island-the Yellow River Estuary fault zone, only few and small earthquakes along the Liaodong Bay and the Laizhou Bay section of the YWFZ. We made a preliminary analysis of the mechanics for this phenomenon. |
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| Keywords: | Yin-Wei fault zone newly-generated fault Neotectonics re-cognition Bohai Sea |
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