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- W2806607126 abstract "Abstract The 2011 M w 5.7 Virginia earthquake and subsequent dense deployment provide us an unprecedented opportunity to study in detail an earthquake sequence within stable continental United States. Here we apply the waveform‐based matched filter technique to obtain more complete earthquake catalogs around the origin time of the Virginia mainshock. With the enhanced earthquake catalogs, we conclude that no foreshock activity existed prior to the Virginia mainshock. The b value map shows significant variations across the aftershock zone, suggesting strong heterogeneity in stress distribution or crustal material in the study region. We also investigate multiple earthquake triggering mechanisms, including static and dynamic triggering, afterslip, and atmospheric pressure changes. We find that dynamic triggering best explains aftershock distributions close to the mainshock's rupture plane, while the activation of off‐fault seismicity is consistent with static Coulomb stress changes. Moreover, an off‐fault earthquake swarm occurred as the Category 2 Hurricane Irene passed by the aftershock zone 5 days after the mainshock, which might be promoted by stress changes associated with atmospheric pressure drop. Our observations suggest that multiple mechanisms may be responsible for triggering aftershocks following one earthquake." @default.
- W2806607126 created "2018-06-13" @default.
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- W2806607126 date "2018-06-01" @default.
- W2806607126 modified "2023-10-17" @default.
- W2806607126 title "Foreshocks,<i>b</i>Value Map, and Aftershock Triggering for the 2011<i>M</i><sub>w</sub>5.7 Virginia Earthquake" @default.
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- W2806607126 doi "https://doi.org/10.1029/2017jb015136" @default.
- W2806607126 hasPublicationYear "2018" @default.
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