Deployment of a nodal array to capture two earthquake clusters near Malibu, California
Hao Zhang, Elizabeth S. Cochran, Xiaozhuo Wei, & Zhongwen ZhanSubmitted September 7, 2025, SCEC Contribution #14713, 2025 SCEC Annual Meeting Poster #TBD
From 2024 to 2025, two active earthquake clusters separated by less than 10 km occurred near Malibu, California. The western earthquake cluster started on February 9th, 2024, with a M4.6 earthquake. The event’s moment tensor indicted an East-West striking normal fault. Seismic activity in a ~2 km radius around the M4.6 event continued through May 2024. On September 12th, , a M4.7 earthquake occurred approximately 10 km east of the earlier M4.6 event, starting a new cluster of activity. The moment tensor solution indicated this event occurred on a NW or NE oriented strike-slip or oblique slip fault. Activity continued in the eastern cluster through 27 January 2025. On February 14th and 15th, 2025, activity started up again within the western cluster with two M3.7 earthquakes, the third M4+ event in the sequence (M4.1) on March 9th, 2025, and a M3.9 earthquake on March 16th, 2025. Given the continued seismic activity in the Malibu area, we initiated a nodal deployment on March 21st, 2025. We deployed two arrays with a total of 58 seismic nodes to collect data that could be used to further study the earthquake clusters. During the 30-day array deployment (March 21-April 22, 2025), 9 earthquakes (M1.05-M2.04) were reported by the Southern California Seismic Network. We present some initial analyses of the data and describe future planned work.
Key Words
Nodal array, Earthquake cluster
Citation
Zhang, H., Cochran, E. S., Wei, X., & Zhan, Z. (2025, 09). Deployment of a nodal array to capture two earthquake clusters near Malibu, California. Poster Presentation at 2025 SCEC Annual Meeting.
Related Projects & Working Groups
Seismology
