Journal
SCIENCE ADVANCES
Volume 7, Issue 15, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abc1606
Keywords
-
Categories
Funding
- NASA Earth Sciences and Interior grant [NNX17AD99G]
- NASA MEaSUREs grant [NNH17ZDA001N]
- Green Foundation Postdoctoral Fellowship at the Scripps Institution of Oceanography
- NASA [1002816, NNX17AD99G] Funding Source: Federal RePORTER
Ask authors/readers for more resources
By investigating the geophysical observations of the 2004 Parkfield earthquake, researchers have revealed the rapid evolution of afterslip in the early post-rupture period, showing its control on aftershock behavior. This study highlights the important roles of aseismic source processes and structural factors in seismicity evolution, offering potential prospects for improving aftershock forecasts.
Large earthquakes often lead to transient deformation and enhanced seismic activity, with their fastest evolution occurring at the early, ephemeral post-rupture period. Here, we investigate this elusive phase using geophysical observations from the 2004 moment magnitude 6.0 Parkfield, California, earthquake. We image continuously evolving afterslip, along with aftershocks, on the San Andreas fault over a minutes-to-days postseismic time span. Our results reveal a multistage scenario, including immediate onset of afterslip following tens-of-seconds-long coseismic shaking, short-lived slip reversals within minutes, expanding afterslip within hours, and slip migration between subparallel fault strands within days. The early afterslip and associated stress changes appear synchronized with local aftershock rates, with increasing afterslip often preceding larger aftershocks, suggesting the control of afterslip on fine-scale aftershock behavior. We interpret complex shallow processes as dynamic signatures of a three-dimensional fault-zone structure. These findings highlight important roles of aseismic source processes and structural factors in seismicity evolution, offering potential prospects for improving aftershock forecasts.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available