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- W3048182743 abstract "Mature strike-slip faults are usually surrounded by a narrow zone of damaged rocks characterized by low seismic wave velocities. Observations of earthquakes along such faults indicate that seismicity is highly concentrated within this fault damage zone. However, the long-term influence of the fault damage zone on complete earthquake cycles, that is, years to centuries, is not well understood. We simulate aseismic slip and dynamic earthquake rupture on a vertical strike-slip fault surrounded by a fault damage zone for a thousand-year timescale using fault zone material properties and geometries motivated by observations along major strike-slip faults. The fault damage zone is approximated asan elastic layer with lower shear wave velocity than the surrounding rock. We find that dynamic wave reflections, whose characteristics are strongly dependent on the width and the rigidity contrast of the fault damage zone, have a prominent effect on the stressing history of the fault. The presence of elastic damage can partially explain the variability in the earthquake sizes and hypocenter locations along a single fault, which vary with fault damage zone depth, width and rigidity contrast from the host rock. The depth extent of the fault damage zone has a pronounced effect on the earthquake hypocenter locations, and shallower fault damage zones favor shallower hypocenters with a bimodal distribution of seismicity along depth. Our findings also suggest significant effects on the hypocenter distribution when the fault damage zone penetrates to the nucleation sites of earthquakes, likely being influenced by both lithological (material) and rheological (frictional) boundaries." @default.
- W3048182743 created "2020-08-13" @default.
- W3048182743 creator A5029234311 @default.
- W3048182743 creator A5066528762 @default.
- W3048182743 creator A5066725549 @default.
- W3048182743 date "2020-08-01" @default.
- W3048182743 modified "2023-10-03" @default.
- W3048182743 title "Effects of Low‐Velocity Fault Damage Zones on Long‐Term Earthquake Behaviors on Mature Strike‐Slip Faults" @default.
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- W3048182743 doi "https://doi.org/10.1029/2020jb019587" @default.
- W3048182743 hasPublicationYear "2020" @default.
- W3048182743 type Work @default.