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Nodal Seismometer Recordings of Aftershocks of the 5 December 2024 Mw 7.0 Offshore Cape Mendocino Earthquake

Description: 

On December 5, 2024, a Mw 7.0 earthquake occurred approximately 70 km southwest of Ferndale, California, just west of the Mendocino Triple Junction. Starting the same day, the U.S. Geological Survey began deploying nodal seismometers (nodes) in the Eel River Valley, Cape Mendocino, and the highway 101 corridor to compliment local permanent Northern California Seismic Network (NCSN) stations. Each of approximately 115 nodal stations contained a SmartSolo IGU-16HR 3-component node, recording continuously at a 2-ms sampling interval and time-corrected using GPS. The nodal stations, combined with the permanent network, provided more densely spaced recordings of events in the area, with the combined network recording 295 Mw 2.5+ aftershocks in the following weeks, 14 of which were greater than Mw 4.0, as determined by the permanent network. The combined dense nodal and permanent network stations expanded the recording azimuth (nodal stations capturing most aftershocks) and are expected to significantly increase the number of events in, and the accuracy of, the current earthquake catalog for the region during the deployment period, particularly when evaluated with machine-learning methods (Yoon et al., 2015; 2023).

Session: New Directions in Environmental, Seismic Hazard and Mineral Resource Exploration Studies [Poster]

Type: Poster

Date: 4/17/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Mark

Student Presenter: No

Invited Presentation: 

Poster Number: 109

Authors