Journal
SCIENCE
Volume 356, Issue 6343, Pages 1157-1160Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aan3120
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Funding
- Japan Society for the Promotion of Science KAKENHI [JP15H05717]
- NSF [NSF-OCE 0623633, NSF-OCE 1334436]
- Deutsche Forschungsgemeinschaft [KO2109/25-1]
- Grants-in-Aid for Scientific Research [16H06477] Funding Source: KAKEN
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The discovery of slow earthquakes has revolutionized the field of earthquake seismology. Defining the locations of these events and the conditions that favor their occurrence provides important insights into the slip behavior of tectonic faults. We report on a family of recurring slow-slip events (SSEs) on the plate interface immediately seaward of repeated historical moment magnitude (Mw) 8 earthquake rupture areas offshore of Japan. The SSEs continue for days to several weeks, include both spontaneous and triggered slip, recur every 8 to 15 months, and are accompanied by swarms of low-frequency tremors. We can explain the SSEs with 1 to 4 centimeters of slip along the megathrust, centered 25 to 35 kilometers (km) from the trench (4 to 10 km depth). The SSEs accommodate 30 to 55% of the plate motion, indicating frequent release of accumulated strain near the trench.
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