Source Characteristics and Along‐Strike Variations of Shallow Very Low Frequency Earthquake Swarms on the Nankai Trough Shallow Plate Boundary
Source Characteristics and Along‐Strike Variations of Shallow Very Low Frequency Earthquake Swarms on the Nankai Trough Shallow Plate Boundary
复制标题
南海海槽浅板边界浅源甚低频震群震源特征及沿走向变化
DOI：
10.1029/2022gl097979
复制
发表时间：
2022
影响因子：
5.2
通讯作者：
Matsuzawa Takanori
中科院分区：
文献类型：
--
作者：
Takemura Shunsuke;Baba Satoru;Yabe Suguru;Emoto Kentaro;Shiomi Katsuhiko;Matsuzawa Takanori
在南海俯冲带的室户角和纪伊海峡附近，我们探测到了浅层甚低频地震（VLFEs），并估计了它们的矩率函数。结合新的和以前估计的目录，我们得到了全面的目录浅层VLFE矩率函数沿沿着南开海槽。我们定义了浅层VLFE群，并研究了它们在每个区域的累积矩、活动面积和持续时间的标度关系。探测到的蜂群被认为是浅层慢滑事件的候选者。在累积矩和活动面积之间观察到类似的比例关系，而不考虑区域。这表明每个区域的应力降相似。然而，累积时刻和持续时间之间的关系有所不同。这种差异可以用浅层慢地震断层条件（如材料或水文性质）沿沿着的变化来解释。
We detected shallow very low frequency earthquakes (VLFEs) off the Cape Muroto and Kii Channel in the Nankai subduction zone and estimated their moment rate functions. Combining the new and previously estimated catalogs, we obtained the comprehensive catalog of shallow VLFE moment rate functions along the Nankai Trough. We defined the shallow VLFE swarms and investigated the scaling relationships of their cumulative moments, activity area, and durations in each region. Detected swarms were considered candidates for shallow slow slip events. A similar scaling relationship was observed between the cumulative moments and activity areas, irrespective of regions. It indicates similar stress drops in each region. However, the relationship between the cumulative moments and durations varied. This difference was explained by the along‐strike variations in the faulting conditions of shallow slow earthquakes, such as material or hydrological properties.