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Triggered non‐similar slip events on repeating earthquake asperities: Results from 3D numerical simulations based on a friction law
Author(s) -
Ariyoshi Keisuke,
Matsuzawa Toru,
Hino Ryota,
Hasegawa Akira
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl028323
Subject(s) - slip (aerodynamics) , asperity (geotechnical engineering) , geology , seismology , subduction , episodic tremor and slip , global positioning system , geodesy , geotechnical engineering , physics , tectonics , telecommunications , thermodynamics , computer science
We investigated the changes in slip rate and recurrence interval of repeating earthquakes using 3‐D numerical simulations of a subduction zone involving large and small asperities and based on a rate‐ and state‐dependent friction law. Our results reveal that the postseismic slip of a large earthquake can trigger an event at a nearby small asperity, although the event may differ to other repeating earthquakes at the asperity because the slip velocity of the event tends to be slower than that of other repeaters; the slip distribution also differs. These results probably explain the observation that the slip amount estimated from repeating earthquake analyses tends to be smaller than that estimated from GPS analyses for large amounts of postseismic slip, as observed for postseismic activity following the 2003 Tokachi‐oki earthquake.