Scholarlink

<p>The Gulf of California and Salton Trough region is an active oblique-divergent plate boundary between the North American and Pacific plates. Its seismicity is well monitored by stations in the Baja California peninsula and in mainland Mexico. Seismicity occurs all along the plate boundary, but not uniformly. The seismicity presents clusters, earthquake groups with small dimensions in both space and time, mainly over certain features like active spreading centers and transform faults. To study the seismic cluster activity in the region, a published method for cluster identification was applied to data from 2017 to the Present from the CICESE Seismological Network, and 34 clusters were identified and characterized. Two main types of seismic clusters were found: the F-type, which corresponds to a main event (or events) and its fore- and aftershocks distributed roughly along a plane, associated with transform faults, and the S-type, which consists mainly of a seismic swarm distributed within a volume and occurs mainly at spreading centers. S-type seismic clusters were found to have longer durations than F-types. Seismic clustering at a particular place appears to occur episodically. Several instances of active clustering were identified for various tectonic elements of the rift system, but no clustering was found outside the rift system, where seismic clusters had been found before the M&#xa0;7.1 El Mayor-Cucapah earthquake, nor in the Gulf below latitude 26° N; this lack of clustering may be due to intervals between episodes larger than the observation, but a definitive explanation remains an open question. Seismic clusters occurring away from mapped tectonic features identify places of interest for further studies because they indicate activity that may be important in the future.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Seismic clusters and tectonics in the Gulf of California

  • 期刊论文

  • 发表日期：

    2025年10月5日

查看全文
  • Lenin Ávila-Barrientos,
  • Mario González-Escobar,
  • F. Alejandro Nava Pichardo

摘要

The Gulf of California and Salton Trough region is an active oblique-divergent plate boundary between the North American and Pacific plates. Its seismicity is well monitored by stations in the Baja California peninsula and in mainland Mexico. Seismicity occurs all along the plate boundary, but not uniformly. The seismicity presents clusters, earthquake groups with small dimensions in both space and time, mainly over certain features like active spreading centers and transform faults. To study the seismic cluster activity in the region, a published method for cluster identification was applied to data from 2017 to the Present from the CICESE Seismological Network, and 34 clusters were identified and characterized. Two main types of seismic clusters were found: the F-type, which corresponds to a main event (or events) and its fore- and aftershocks distributed roughly along a plane, associated with transform faults, and the S-type, which consists mainly of a seismic swarm distributed within a volume and occurs mainly at spreading centers. S-type seismic clusters were found to have longer durations than F-types. Seismic clustering at a particular place appears to occur episodically. Several instances of active clustering were identified for various tectonic elements of the rift system, but no clustering was found outside the rift system, where seismic clusters had been found before the M 7.1 El Mayor-Cucapah earthquake, nor in the Gulf below latitude 26° N; this lack of clustering may be due to intervals between episodes larger than the observation, but a definitive explanation remains an open question. Seismic clusters occurring away from mapped tectonic features identify places of interest for further studies because they indicate activity that may be important in the future.

Graphical abstract