Rupture Process of the Mw7.0 December 5, 2024 Offshore Cape Mendocino Earthquake
Abstract The Mw7.0 December 5, 2024 Offshore Cape Mendocino earthquake ruptured a ∼60 km long portion of the east‐west trending Mendocino fault zone (MFZ). In order to clarify the rupture process, we assemble three‐component seismograms from regional seismic stations, horizontal coseismic displaceme...
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Wiley
2025-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2025GL115613 |
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| author | F. F. Pollitz K. A. Guns C. E. Yoon |
| author_facet | F. F. Pollitz K. A. Guns C. E. Yoon |
| author_sort | F. F. Pollitz |
| collection | DOAJ |
| description | Abstract The Mw7.0 December 5, 2024 Offshore Cape Mendocino earthquake ruptured a ∼60 km long portion of the east‐west trending Mendocino fault zone (MFZ). In order to clarify the rupture process, we assemble three‐component seismograms from regional seismic stations, horizontal coseismic displacement vectors derived from Global Navigation Satellite System (GNSS) time series, and a Sentinel‐1 ascending interferogram. These data are interpreted with a model of slip distributed on two vertical fault planes representative of the eastern MFZ and spanning the ∼70 km length of the aftershock zone. Assuming right‐lateral strike slip, we find that the rupture initiates in the oceanic mantle at 20−30 km depth and proceeds unilaterally updip and toward the east. Early aftershocks locate adjacent to the peak slip areas, tracking the coseismic rupture propagation from oceanic mantle to shallower depth and implying a significant role of static stress transfer in driving aftershocks in an ocean plate environment. |
| format | Article |
| id | doaj-art-02259aa49ae949efaf4aad73e9905793 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-02259aa49ae949efaf4aad73e99057932025-08-20T02:46:20ZengWileyGeophysical Research Letters0094-82761944-80072025-07-015214n/an/a10.1029/2025GL115613Rupture Process of the Mw7.0 December 5, 2024 Offshore Cape Mendocino EarthquakeF. F. Pollitz0K. A. Guns1C. E. Yoon2Earthquake Science Center U.S. Geological Survey Seattle WA USAEarthquake Science Center U.S. Geological Survey Moffett Field CA USAEarthquake Science Center U.S. Geological Survey Pasadena CA USAAbstract The Mw7.0 December 5, 2024 Offshore Cape Mendocino earthquake ruptured a ∼60 km long portion of the east‐west trending Mendocino fault zone (MFZ). In order to clarify the rupture process, we assemble three‐component seismograms from regional seismic stations, horizontal coseismic displacement vectors derived from Global Navigation Satellite System (GNSS) time series, and a Sentinel‐1 ascending interferogram. These data are interpreted with a model of slip distributed on two vertical fault planes representative of the eastern MFZ and spanning the ∼70 km length of the aftershock zone. Assuming right‐lateral strike slip, we find that the rupture initiates in the oceanic mantle at 20−30 km depth and proceeds unilaterally updip and toward the east. Early aftershocks locate adjacent to the peak slip areas, tracking the coseismic rupture propagation from oceanic mantle to shallower depth and implying a significant role of static stress transfer in driving aftershocks in an ocean plate environment.https://doi.org/10.1029/2025GL115613seismic sourceoceanic transform faultrupture process |
| spellingShingle | F. F. Pollitz K. A. Guns C. E. Yoon Rupture Process of the Mw7.0 December 5, 2024 Offshore Cape Mendocino Earthquake Geophysical Research Letters seismic source oceanic transform fault rupture process |
| title | Rupture Process of the Mw7.0 December 5, 2024 Offshore Cape Mendocino Earthquake |
| title_full | Rupture Process of the Mw7.0 December 5, 2024 Offshore Cape Mendocino Earthquake |
| title_fullStr | Rupture Process of the Mw7.0 December 5, 2024 Offshore Cape Mendocino Earthquake |
| title_full_unstemmed | Rupture Process of the Mw7.0 December 5, 2024 Offshore Cape Mendocino Earthquake |
| title_short | Rupture Process of the Mw7.0 December 5, 2024 Offshore Cape Mendocino Earthquake |
| title_sort | rupture process of the mw7 0 december 5 2024 offshore cape mendocino earthquake |
| topic | seismic source oceanic transform fault rupture process |
| url | https://doi.org/10.1029/2025GL115613 |
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