Small repeating earthquake activity. interplate quasi-static slip, and interplate couplingin the Hyuga-nada, southwestern Japan subduction zone
Small repeating earthquake activity. interplate quasi-static slip, and interplate couplingin the Hyuga-nada, southwestern Japan subduction zone
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小规模重复地震活动。
DOI：
10.1029/2012gl051476
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发表时间：
2012
影响因子：
5.2
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
Yamashita;et al.
小重复地震（RE）分析是估计板间准静滑动的有效方法，是板间耦合的良好指标。我们检测了170个连续型板间RE群，并估算了近17年来日贺那达地区准静态滑动的空间变化。与日本东北部俯冲带相比，该区稀土元素活动具有不同的特征，可能反映了俯冲性质的差异。我们的研究结果表明，板块间耦合沿海沟轴和倾斜方向在空间上发生变化，这一现象无法通过陆基全球定位系统（GPS）分析来解决。通过比较地震活动性，低滑动率区域与大、中规模板间地震的震源和陡坡位置相对应，表明这些位置存在很强的板间耦合。这些结果表明，由RE活动估计的滑动率分布是可靠的，对评估未来大地震的可能性是有用的。
Small repeating earthquake (RE) analysis is a useful method for estimating interplate quasi‐static slip, which is a good indicator of interplate coupling. We detected 170 continual‐type interplate RE groups and then estimated the spatial variation in quasi‐static slip in the Hyuga‐nada over the past 17 years. The RE activity in this region has different characteristics compared with that in the northeast Japan subduction zone, presumably reflecting differences in the subduction properties. Our results revealed that interplate coupling spatially changes along the trench‐axis and dip‐direction—a phenomenon that cannot be resolved by land‐based Global Positioning System (GPS) analysis. By comparing seismicity, the low‐slip‐rate areas correspond with the location of hypocenters and asperities for large‐ and moderate‐sized interplate earthquakes, suggesting strong interplate coupling at these sites. These results indicate that the slip rate distribution estimated from RE activity is reliable and useful for assessing the potential of future large earthquakes.