Relationship Between the 2019 Ridgecrest, California, 7.1 Earthquake and Its 6.4 Foreshock Sequence.

Entropy (Basel)

Shandong Earthquake Agency, China Earthquake Administration, Jinan 250102, China.

Published: December 2024

The 2019 Ridgecrest 7.1 earthquake has received significant attention due to its complex fault activity. It is also noticeable for its 6.4 foreshock sequence. There are intricate dynamic relationships between earthquakes in such vigorous sequences. Based on the relocated catalogue, we adopt the nearest neighbour algorithm to analyze its foreshock and aftershock sequences. Detailed links and family structures of the sequence are obtained. The results show that a 5.0 event at 03:16 (UTC) on 6 July is a direct foreshock of the 7.1 mainshock. It is likely related to barriers on the northwest-striking fault. The 6.4 event on 4 July is characterized as a complex conjugate rupture. Notably, a magnitude 4.0 event occurred on the northwest-striking fault before the 6.4 event, establishing it as a direct foreshock. The Ridgecrest sequence is predominantly influenced by northwest fault activity. It first caused small fractures on the northwest-striking fault. Then, it triggered conjugate slips on the southwest-striking fault. Lastly, it led to larger ruptures on the northwest-striking fault.

Download full-text PDF

Source
http://dx.doi.org/10.3390/e27010016DOI Listing

Publication Analysis

Top Keywords

northwest-striking fault
16
2019 ridgecrest
8
foreshock sequence
8
fault activity
8
direct foreshock
8
fault event
8
fault
7
foreshock
5
relationship 2019
4
ridgecrest california
4

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!