Group A, Poster #097, Earthquake Geology
Testing the potential for static triggering of Holocene earthquakes on faults in the Panamint and Searles Valleys, northern ECSZ
Poster Image:
Poster Presentation
2024 SCEC Annual Meeting, Poster #097, SCEC Contribution #13777 VIEW PDF
during the Holocene. We used Coulomb 3.3 to model static stress changes on multiple combinations of source-receiver fault geometries to assess which rupture scenarios might promote statically-triggered ruptures on adjacent faults.
We find that rupture on all Panamint-Ash Hill-PVTR fault geometries produces negative Coulomb stress changes, which would discourage earthquake triggering via static stress transfer. Alternatively, the Manly Pass-Searles Valley-Panamint Valley source-receiver fault models produced positive Coulomb stress changes that may encourage static stress triggering. However, Manly Pass-Searles Valley faults have reportedly low Quaternary slip rates (~0.2 - 0.4 mm/yr), suggesting that it is unlikely that they are the primary source for seismogenic strain transfer between adjacent faults in the Panamint and Searles Valleys. Ultimately, we find that if the Panamint Valley, Ash Hill, and PVTR faults rupture in coordinated events, as is suggested by paleoseismic data, this process is unlikely to occur as a result of static stress transfer. More complex models that involve dynamic stress triggering, transtensional basin extension, or strain accommodation via rotation may be required to explain the seismogenic strain transfer in Panamint Valley during the Holocene.
SHOW MORE
We find that rupture on all Panamint-Ash Hill-PVTR fault geometries produces negative Coulomb stress changes, which would discourage earthquake triggering via static stress transfer. Alternatively, the Manly Pass-Searles Valley-Panamint Valley source-receiver fault models produced positive Coulomb stress changes that may encourage static stress triggering. However, Manly Pass-Searles Valley faults have reportedly low Quaternary slip rates (~0.2 - 0.4 mm/yr), suggesting that it is unlikely that they are the primary source for seismogenic strain transfer between adjacent faults in the Panamint and Searles Valleys. Ultimately, we find that if the Panamint Valley, Ash Hill, and PVTR faults rupture in coordinated events, as is suggested by paleoseismic data, this process is unlikely to occur as a result of static stress transfer. More complex models that involve dynamic stress triggering, transtensional basin extension, or strain accommodation via rotation may be required to explain the seismogenic strain transfer in Panamint Valley during the Holocene.
SHOW MORE
Citation: LaPlante, A., & Regalla, C. (2024, 09). Testing the potential for static triggering of Holocene earthquakes on faults in the Panamint and Searles Valleys, northern ECSZ. Poster Presentation at 2024 SCEC Annual Meeting.
Keywords: Panamint Valley, Searles Valley, ECSZ, complex rupture, paleorupture, Coulomb modelling, static stress transfer
SCEC Award: 23105
MORE FROM EARTHQUAKE GEOLOGY
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
