期刊
PURE AND APPLIED GEOPHYSICS
卷 173, 期 4, 页码 1011-1020出版社
SPRINGER BASEL AG
DOI: 10.1007/s00024-016-1271-6
关键词
2015 Illapel Chile earthquake; Source process; Kinematic waveform inversion; Hybrid backprojection; Subduction zone earthquake; Along-dip rupture propagation
资金
- KAKENHI from the Japan Society for the Promotion of Science [24310133]
- CONICYT grant FONDAP [15110017]
- FONDECYT [11140424]
- Chile-Japan Joint Project on Enhancement of Technology to Develop Tsunami Resilient Communities
- Japan Science and Technology Agency (JST)
- Japan International Cooperation Agency through its SATREPS initiative
- Grants-in-Aid for Scientific Research [16J00298] Funding Source: KAKEN
We constructed a seismic source model for the 2015 M (W) 8.3 Illapel, Chile earthquake, which was carried out with the kinematic waveform inversion method adopting a novel inversion formulation that takes into account the uncertainty in the Green's function, together with the hybrid backprojection method enabling us to track the spatiotemporal distribution of high-frequency (0.3-2.0 Hz) sources at high resolution by using globally observed teleseismic P-waveforms. A maximum slip amounted to 10.4 m in the shallow part of the seismic source region centered 72 km northwest of the epicenter and generated a following tsunami inundated along the coast. In a gross sense, the rupture front propagated almost unilaterally to northward from the hypocenter at < 2 km/s, however, in detail the spatiotemporal slip distribution also showed a complex rupture propagation pattern: two up-dip rupture propagation episodes, and a secondary rupture episode may have been triggered by the strong high-frequency radiation event at the down-dip edge of the seismic source region. High-frequency sources tends to be distributed at deeper parts of the slip area, a pattern also documented in other subduction zone megathrust earthquakes that may reflect the heterogeneous distribution of fracture energy or stress drop along the fault. The weak excitation of high-frequency radiation at the termination of rupture may represent the gradual deceleration of rupture velocity at the transition zone of frictional property or stress state between the megathrust rupture zone and the swarm area.
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