Details

Autor(en) / Beteiligte

• Kato, Aitaro
• Fukuda, Jun'ichi
• Nakagawa, Shigeki
• Obara, Kazushige

Titel

Foreshock migration preceding the 2016 Mw 7.0 Kumamoto earthquake, Japan

Ist Teil von

• Geophysical research letters, 2016-09, Vol.43 (17), p.8945-8953

Ort / Verlag

Washington: Blackwell Publishing Ltd

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Wiley eJournals

Beschreibungen/Notizen

• We investigated the spatiotemporal evolution of an earthquake sequence following a series of large shallow intraplate earthquakes, including a Mw 6.2 foreshock and Mw 7.0 main shock, in the Kumamoto area of Kyushu, SW Japan. To more precisely characterize the evolution of the earthquake sequences, we applied a matched filter technique to continuous waveform data, using template events obtained via a double‐difference relocation algorithm. Migrations of seismicity fronts along the directions of fault strike and dip are clearly seen, starting immediately after the Mw 6.2 foreshock. These migrations are interpreted to result from aseismic slip triggered by the foreshock, propagating toward the nucleation point of the subsequent Mw 7.0 main shock rupture. When combined with static stress changes induced by the Mw 6.2 foreshock, it is likely that stress transfer from both aseismic and seismic slip during the foreshock sequence loaded stress onto the main shock rupture faults, bringing them closer to failure. Key Points Clear foreshock migration along the directions of fault strike and dip, including propagation toward the main shock nucleation point Foreshock migrations likely represent the propagation of aseismic slip transients along active faults triggered by the Mw 6.2 foreshock Stress transfer from both aseismic and seismic slip during the foreshock sequence loaded stress onto the main shock rupture faults