- S21E-0244: Quasi-periodic Repeating Earthquakes May Follow Normal Cubic Scaling Law as Regular Earthquakes
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Board 0244‚ Hall EFG (Poster Hall)NOLA CC
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Binhao Wang, University of Southern California (First Author, Presenting Author)
Baoning Wu, Scripps Institution of Oceanography, University of California San Diego
Yijian Zhou, Division of Geological and Planetary Sciences, California Institute of Technology
Repeating earthquakes happen when the same part of a fault breaks repeatedly, while the rest of the fault moves slowly. These earthquakes help scientists understand how predictable earthquakes are and how faults move over time. A key relationship in studying these earthquakes links how often they happen (recurrence time) to their size (seismic moment). In this study, we re-examine this relationship using a new earthquake catalog. We find that the quasi-periodic repeating earthquakes likely follow the normal scaling relationship as other earthquakes do. Some repeating earthquakes that reoccur less frequently than expected may drain more energy, or may have occurred on secondary faults that are slipping slowly. Our results suggest that further adjustments to the rates of fault movement, the stress released in earthquakes, and the way we measure earthquake size might provide a more accurate estimate of the empirical scaling relationship between earthquake recurrence and size.
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