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首页> 外文期刊>Seismological research letters >Earthquake Potential of Active Faults in Taiwan from GPS Observations and Block Modeling
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Earthquake Potential of Active Faults in Taiwan from GPS Observations and Block Modeling

机译：从GPS观测和区块模拟看台湾活动断裂的地震潜力

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摘要

Taiwan is located at the boundary between the Philippine Sea plate and the passive continental margin of the Eurasian plate and is one of the most seismically active regions in the world. In an attempt to evaluate the seismogenic potential of active faults in Taiwan, we separated the region into 34 blocks with 27 known active faults as their boundaries and employed a 3D elastic block modeling method to invert the Global-Positioning- System-measured surface deformation for block rotations and the fault coupling. Additional constraints from an upto- date dataset of geologic fault-slip rates were introduced to reconcile the discrepancy between the geodetically and geologically determined long-term slip rates. Our results show that the Hsinhua fault and the southern part of the Longitudinal Valley fault may be weakly coupled near the surface and therefore experience shallow creeping in the interseismic period. The slip-deficit rates, which relate to how fast the elastic strain is accumulated on faults, are relatively low (0: 8-2: 2 mm/yr) for faults in northern Taiwan compared with up to 4 mm/yr in the Western foothill of the central and southwestern Taiwan. Evaluations of earthquake potential based on our new modeling results indicate that the frontal thrust and the westernmost branch faults of central Taiwan and the northern Longitudinal Valley fault of eastern Taiwan are capable of generating Mw 6.0-7.3 earthquakes in the next few decades.
机译：台湾位于菲律宾海板块与欧亚板块的被动大陆边缘之间的边界，是世界上地震活动最活跃的地区之一。为了评估台湾活动断裂的发震潜力，我们将区域划分为以27个已知活动断裂为边界的34个区块，并采用3D弹性区块建模方法将Global-Positioning-System测量的表面变形反演为阻止旋转和故障耦合。引入了来自最新地质断层滑移率数据集的其他约束条件，以调和大地测量和地质确定的长期滑移率之间的差异。我们的研究结果表明，新华断裂和纵谷断裂的南部可能在地表附近弱耦合，因此在地震之间经历了浅层蠕动。台湾北部断层的滑动缺损率相对较低（0：8-2：2 mm / yr），与断层上弹性应变的累积速度有关，而西部地区的断层缺损率则高达4 mm / yr。台湾中部和西南部的山麓。根据我们新的模拟结果对地震潜力的评估表明，台湾中部的前缘逆冲断层和最西端的分支断层以及台湾东部的北部纵向谷断层在未来几十年内将产生6.0-7.3兆瓦地震。

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