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The 1 April 2014 Iquique, Chile, M w 8.1 earthquake rupture sequence

2014; American Geophysical Union; Volume: 41; Issue: 11 Linguagem: Inglês

10.1002/2014gl060238

1944-8007

Thorne Lay, Han Yue, E. E. Brodsky, Chao An,

Earthquake Detection and Analysis

On 1 April 2014, a great (Mw 8.1) interplate thrust earthquake ruptured in the northern portion of the 1877 earthquake seismic gap in northern Chile. The sequence commenced on 16 March 2014 with a magnitude 6.7 thrust event, followed by thrust-faulting aftershocks that migrated northward ~40 km over 2 weeks to near the main shock hypocenter. Guided by short-period teleseismic P wave backprojections and inversion of deepwater tsunami wave recordings, a finite-fault inversion of teleseismic P and SH waves using a geometry consistent with long-period seismic waves resolves a spatially compact large-slip (~2–6.7 m) zone located ~30 km downdip and ~30 km along-strike south of the hypocenter, downdip of the foreshock sequence. The main shock seismic moment is 1.7 × 1021 N m with a fault dip of 18°, radiated seismic energy of 4.5–8.4 × 1016 J, and static stress drop of ~2.5 MPa. Most of the 1877 gap remains unbroken and hazardous.