首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Characteristics of the fault-related rocks, fault zones and the principal slip zone in the Wenchuan Earthquake Fault Scientific Drilling Project Hole-1 (WFSD-1)
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Characteristics of the fault-related rocks, fault zones and the principal slip zone in the Wenchuan Earthquake Fault Scientific Drilling Project Hole-1 (WFSD-1)

机译:汶川地震断层科学钻探工程一号洞(WFSD-1)断层相关岩石,断层带和主滑带的特征

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Scientific drilling in active faults after a large earthquake is ideal to study earthquake mechanisms. The Wenchuan earthquake Fault Scientific Drilling project (WFSD) is an extremely rapid response to the 2008 Ms 8.0 Wenchuan earthquake, which happened along the Longmenshan fault, eastern margin of the Tibetan Plateau. In order to better understand the fault mechanism and the physical and chemical characteristics of the rocks, the WFSD project will eventually drill 5 boreholes along the two main faults. This paper focuses on the first hole (WFSD-1), which started just 178. days after the earthquake, down to a final depth of 1201.15. m. Petrological and structural analyses of the cores allowed the identification of fault-related rocks in the Yingxiu-Beichuan fault (fault gouge, cataclasite, and fault breccia), and the Principle Slip Zone (PSZ) location of the Wenchuan earthquake was determined.We found 12 fault zones in the entire core profile, with at least 10, including the Yingxiu-Beichuan fault zone, with a multiple cores structure and minimum width of ~. 100. m. The co-seismic slip plane of the Wenchuan earthquake at depth (corresponding to the Yingxiu-Beichuan fault zone at the outcrop), as well as its PSZ, was expected to be located at the bottom of the fault zone (at 759. m-depth). Instead, it was found at ~590. m-depth with 1. cm-wide fresh fault gouge, as determined by logging data such as temperature, natural gamma ray, p-wave velocity and resistivity, combined with the fresh appearance, magnetic susceptibility, and microstructure of the gouge. The Wenchuan earthquake slip plane has a dip angle of ~. 65°, showing the high-angle thrust feature. The distribution of fault gouge with several meters thick, the location of the Wenchuan earthquake's PSZ and the thickness of fresh gouge all imply a correlation between the width of the fault zone and the number of seismic events.
机译:大地震后在活动断层中进行科学钻探是研究地震机制的理想选择。汶川地震断层科学钻探项目(WFSD)是对2008年汶川8.0级地震的快速响应,汶川8.0级地震发生在青藏高原东缘龙门山断层。为了更好地了解岩石的断层机理和理化特性,WFSD项目最终将沿着两个主要断层钻探5个钻孔。本文关注的是第一个洞(WFSD-1),该洞在地震发生后178天才开始,直至最终深度1201.15。米通过岩心的岩石学和结构分析,可以鉴定出映秀-北川断层中的断层相关岩石(断层泥,崩落石和断层角砾岩),并确定了汶川地震的主滑带(PSZ)位置。整个岩心剖面中有12个断裂带,其中至少有10个,包括映秀-北川断裂带,具有多核结构,最小宽度为〜。 100米汶川地震的深部同震滑动面(对应于露头的映秀-北川断裂带)及其PSZ预计位于断裂带的底部(759。m-深度)。相反,它被发现在〜590。 m深度为1. cm宽的新鲜断层泥,由测井数据(例如温度,天然伽马射线,p波速度和电阻率)与泥的新鲜外观,磁化率和微观结构相结合确定。汶川地震滑移面的倾角为〜。 65°,显示高角度推力功能。几米厚的断层泥的分布,汶川地震的PSZ的位置和新鲜断层的厚度都暗示断层带的宽度与地震事件的数量之间存在相关性。

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