The Imbricated Foreshock and Aftershock Activities of the Balsorano (Italy) Mw 4.4 Normal Fault Earthquake and Implications for Earthquake Initiation
The Imbricated Foreshock and Aftershock Activities of the Balsorano (Italy) Mw 4.4 Normal Fault Earthquake and Implications for Earthquake Initiation
复制标题
意大利巴尔索拉诺 Mw 4.4 正断层地震的叠瓦状前震和余震活动及其对震源的影响
DOI：
10.1002/essoar.10503659.1
复制
发表时间：
2020
影响因子：
3.3
通讯作者：
P. Poli
中科院分区：
文献类型：
--
作者：
H. Sánchez;David Essing;É. Beaucé;P. Poli
微震活动形式的前震是研究主震前发生的物理过程的最有力的工具之一。然而，它们的检测和精确描述仍然很稀少，特别是对于中小地震(Mw<；6)。本文对2019年11月7日意大利巴尔索拉诺正断层4.4级地震进行了详细的前震分析。为了提高对主震前后微震活动性的探测，我们通过模板匹配，在距离目标地震活动性小于75公里的地方使用了6个三分量宽带接收器。为了加深对地震孕育过程背后的物理机制(S)以及其他伴随现象的理解，我们还利用波形聚集和震源重新定位详细描述了与这次中等规模地震有关的序列的时空演化。这一分析揭示了前震和余震之间的明显差异。此外，还揭示了与不同地震活动相关的五种不同的时空图像。前震所显示的观察到的时空行为突出了一个复杂的启动过程，显然是从邻近的未映射的对置断层开始的。最后，余震活动由四个不同的星团组成，它们具有不同的时空模式，这表明该序列中的不同星团具有不同的触发机制。
Foreshocks in the form of microseismicity are among the most powerful tools to study the physical processes that occur before main earthquakes. However, their detection and precise characterization is still sparse, especially for small-to-moderate-size earthquakes (Mw<6). We present here a detailed foreshock analysis for the 7 November 2019, Balsorano, Italy, normal fault earthquake (Mw 4.4). To improve the detection of the microseismicity before and after the mainshock, we use six three-component broadband receivers at distances of less than 75 km from the targeted seismicity, through template matching. To improve the understanding of the physical mechanism(s) behind the earthquake initiation process, as well as other accompanying phenomena, we also detail the spatiotemporal evolution of the sequence associated with this medium-sized earthquake, using waveform clustering and hypocenter relocation. Clear differences between foreshocks and aftershocks are revealed by this analysis. Moreover, five distinct spatiotemporal patterns associated with the different seismic activities are revealed. The observed spatiotemporal behavior shown by the foreshocks highlights a complex initiation process, which apparently starts on an adjacent unmapped antithetic fault. Finally, the aftershock activity comprises four different clusters with distinct spatiotemporal patterns, which suggests that the different clusters in this sequence have distinct triggering mechanisms.
登录
查看更多内容
影响因子：
3.5
作者：
Wessel, P.;Luis, J. F.;Tian, D.
通讯作者：
Tian, D.
影响因子：
3.9
作者：
McLaskey, Gregory C.
通讯作者：
McLaskey, Gregory C.
影响因子：
18.3
作者：
C. Tape;S. Holtkamp;V. Silwal;J. Hawthorne;Y. Kaneko;J. Ampuero;C. Ji;N. Ruppert;Kyle Smith;M. West
通讯作者：
C. Tape;S. Holtkamp;V. Silwal;J. Hawthorne;Y. Kaneko;J. Ampuero;C. Ji;N. Ruppert;Kyle Smith;M. West
影响因子：
64.8
作者：
Schurr, Bernd;Asch, Guenter;Vilotte, Jean-Pierre
通讯作者：
Vilotte, Jean-Pierre