Catalog of small repeating earthquakes for the Japanese Islands
Catalog of small repeating earthquakes for the Japanese Islands
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DOI：
10.1186/s40623-020-01205-2
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发表时间：
2020-05-29
影响因子：
3
通讯作者：
Igarashi, Toshihiro
中科院分区：
文献类型：
--
作者：
Igarashi, Toshihiro
在世界范围内的各种构造环境中提取了发生在大致相同位置并具有相似震源机制的重复地震组。它们的重现期已被用来估计沿沿着主要构造边界的滑动的时空演化。此外，还分析了重复地震波形之间的微小变化，以描绘当地地震速度结构的时间变化。在这里，我们构建了一个长期的目录小重复地震在日本中部自1981年以来，整个日本群岛自2001年以来（2001-2019年）的基础上波形相似性和相对震源位置。大部分的长持续时间序列位于菲律宾海和太平洋板块的强耦合区附近，因为它们分别从琉球-南海-相模和千岛-日本海沟俯冲。许多发生在地壳浅部环境中的重复层序是短暂的。这种重复的地震目录使我们能够估计沿着沿着每个构造边界的滑动历史。我们相信，这个和类似的目录将是有用的，为未来的调查源过程，时间滑动和应力变化沿着断层，和当地的速度结构，从而提供新的见解地震生成机制。
Groups of repeating earthquakes, which occur in approximately the same location and possess a similar focal mechanism, have been extracted in various tectonic environments worldwide. Their recurrence interval has been used to estimate the spatiotemporal evolution of aseismic slip along major tectonic boundaries. Furthermore, slight changes between the waveforms of repeating earthquakes have been analyzed to delineate temporal changes in the local seismic velocity structure. Here, we construct a long-term catalog of small repeating earthquakes in the central Japan since 1981 and throughout the Japanese Islands since 2001 (2001-2019) based on waveform similarity and relative source locations. Most of the long-duration sequences are located near the strongly coupled areas of the Philippine Sea and Pacific plates as they subduct from the Ryukyu-Nankai-Sagami and Kuril-Japan trenches, respectively. Many of the repeating sequences that occur in shallow crustal environments are short-lived. This repeating earthquake catalog allows us to estimate the slip history along each tectonic boundary. We believe that this and similar catalogs will be useful for future investigations of source processes, temporal slip and stress changes along faults, and local velocity structures, thereby providing new insights into earthquake generation mechanisms.