Spatially Consistent Small‐Scale Stress Heterogeneity Revealed by the 2008 Mogul, Nevada, Earthquakes
We compute and analyze stress drops for 4175 earthquakes (M_L 0–5) in the 2008 Mogul, Nevada, swarm–mainshock sequence using a spectral decomposition approach that uses depth‐dependent path corrections. We find that the highest stress‐drop foreshocks occur within the fault zone of the M_w 4.9 mainsh...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Seismological Society of America
2023-09-01
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| Series: | The Seismic Record |
| Online Access: | https://doi.org/10.1785/0320230026 |
| _version_ | 1797506025509617664 |
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| author | Christine J. Ruhl Rachel E. Abercrombie Peter M. Shearer |
| author_facet | Christine J. Ruhl Rachel E. Abercrombie Peter M. Shearer |
| author_sort | Christine J. Ruhl |
| collection | DOAJ |
| description | We compute and analyze stress drops for 4175 earthquakes (M_L 0–5) in the 2008 Mogul, Nevada, swarm–mainshock sequence using a spectral decomposition approach that uses depth‐dependent path corrections. We find that the highest stress‐drop foreshocks occur within the fault zone of the M_w 4.9 mainshock, nucleating at the edges of seismicity voids and concentrating near complexities in the fault geometry, confirming and extending inferences from prior work based on empirical Green’s functions for ∼150 of the larger Mogul earthquakes. The region of the highest stress‐drop foreshocks is not reruptured by aftershocks, whereas low‐stress‐drop areas are consistently low during both the foreshock and aftershock periods, implying that stress drop depends on inherent individual fault properties rather than timing within the sequence. These results have implications for swarm evolution and fault activation within complex 3D structures. |
| first_indexed | 2024-03-10T04:26:43Z |
| format | Article |
| id | doaj.art-5d7a60c9aec642109dfde089a399b77e |
| institution | Directory Open Access Journal |
| issn | 2694-4006 |
| language | English |
| last_indexed | 2024-03-10T04:26:43Z |
| publishDate | 2023-09-01 |
| publisher | Seismological Society of America |
| record_format | Article |
| series | The Seismic Record |
| spelling | doaj.art-5d7a60c9aec642109dfde089a399b77e2023-11-23T06:47:35ZengSeismological Society of AmericaThe Seismic Record2694-40062023-09-013323924810.1785/032023002623026Spatially Consistent Small‐Scale Stress Heterogeneity Revealed by the 2008 Mogul, Nevada, EarthquakesChristine J. Ruhl0https://orcid.org/0000-0002-7764-3165Rachel E. Abercrombie1https://orcid.org/0000-0003-4515-5420Peter M. Shearer2https://orcid.org/0000-0002-2992-7630Department of Geosciences, The University of Tulsa, Tulsa, Oklahoma, U.S.A.Nevada Seismological Laboratory, University of Nevada, Reno, Reno, Nevada, U.S.A.Scripps Institution of Oceanography, IGPP, University of California, San Diego, La Jolla, California, U.S.A.We compute and analyze stress drops for 4175 earthquakes (M_L 0–5) in the 2008 Mogul, Nevada, swarm–mainshock sequence using a spectral decomposition approach that uses depth‐dependent path corrections. We find that the highest stress‐drop foreshocks occur within the fault zone of the M_w 4.9 mainshock, nucleating at the edges of seismicity voids and concentrating near complexities in the fault geometry, confirming and extending inferences from prior work based on empirical Green’s functions for ∼150 of the larger Mogul earthquakes. The region of the highest stress‐drop foreshocks is not reruptured by aftershocks, whereas low‐stress‐drop areas are consistently low during both the foreshock and aftershock periods, implying that stress drop depends on inherent individual fault properties rather than timing within the sequence. These results have implications for swarm evolution and fault activation within complex 3D structures.https://doi.org/10.1785/0320230026 |
| spellingShingle | Christine J. Ruhl Rachel E. Abercrombie Peter M. Shearer Spatially Consistent Small‐Scale Stress Heterogeneity Revealed by the 2008 Mogul, Nevada, Earthquakes The Seismic Record |
| title | Spatially Consistent Small‐Scale Stress Heterogeneity Revealed by the 2008 Mogul, Nevada, Earthquakes |
| title_full | Spatially Consistent Small‐Scale Stress Heterogeneity Revealed by the 2008 Mogul, Nevada, Earthquakes |
| title_fullStr | Spatially Consistent Small‐Scale Stress Heterogeneity Revealed by the 2008 Mogul, Nevada, Earthquakes |
| title_full_unstemmed | Spatially Consistent Small‐Scale Stress Heterogeneity Revealed by the 2008 Mogul, Nevada, Earthquakes |
| title_short | Spatially Consistent Small‐Scale Stress Heterogeneity Revealed by the 2008 Mogul, Nevada, Earthquakes |
| title_sort | spatially consistent small scale stress heterogeneity revealed by the 2008 mogul nevada earthquakes |
| url | https://doi.org/10.1785/0320230026 |
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