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首页> 外文期刊>Pure and Applied Geophysics >Seismic Risk on the Northern Xiaojiang Fault Implied by the Latest and Nearest GPS Observations
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Seismic Risk on the Northern Xiaojiang Fault Implied by the Latest and Nearest GPS Observations

机译：最新且最近的GPS观测暗示北江北部北部断层的地震风险

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摘要

On the basis of the continuous and dense GPS observations covering the northern segment of the Xiaojiang fault zone (n-XJFZ) from March 2012 to March 2016, we present the velocity field, spatiotemporal deformation, slip rate and locking depth of the n-XJFZ. The results provide strong support for achieving a better understanding of the deformation behavior of this fault. The heterogeneity of the GPS velocity field and relatively nonuniform distribution of seismicity suggest that the observational area is fragmented. Shear strain has been accumulating with an almost constant azimuth, which is consistent with the trends of the mapped major faults. The 2014 Ms 6.5 Ludian earthquake produced a sudden change in the dilatational strain, which was almost constant prior to the event, and an increase in the shear strain rate. The near-field deformation of the n-XJFZ estimated with the near-field data was larger than expected, revealing that the n-XJFZ is becoming more locked. These results imply that the seismic risk in the study area is currently rising and that, similar to the 2014 Ms 6.5 Ludian earthquake, future earthquakes will possibly occur away from mapped faults.
机译：在2012年3月至2016年3月覆盖小江断层区（N-XJFZ）的连续和密集的GPS观察，我们介绍了N-XJFZ的速度场，时空变形，滑动速率和锁定深度。结果为实现了对该故障的变形行为来实现了强有力的支持。 GPS速度场的异质性和地震性的相对不均匀分布表明观察区域是碎片化的。剪切应变一直累积，几乎恒定的方位角，这与映射的主要故障的趋势一致。 2014 MS 6.5 Ludian地震产生了扩张菌株的突然变化，在事件之前几乎是恒定的，并且增加剪切应变率。用近场数据估计的N-XJFZ的近场变形大于预期，揭示了N-XJFZ变得越来越锁定。这些结果意味着研究领域的地震风险目前正在上升，类似于2014年6.5卢迪瓦地震，未来地震可能会消除映射断层。

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