Accelerated nucleation of the 2014 Iquique, Chile Mw 8.2 Earthquake.

ABSTRACT: The earthquake nucleation process has been vigorously investigated based on geophysical observations, laboratory experiments, and theoretical studies; however, a general consensus has yet to be achieved. Here, we studied nucleation process for the 2014 Iquique, Chile Mw 8.2 megathrust earthquake located within the current North Chile seismic gap, by analyzing a long-term earthquake catalog constructed from a cross-correlation detector using continuous seismic data. Accelerations in seismicity, the amount of aseismic slip inferred from repeating earthquakes, and the background seismicity, accompanied by an increasing frequency of earthquake migrations, started around 270 days before the mainshock at locations up-dip of the largest coseismic slip patch. These signals indicate that repetitive

SUBMITTER: Kato A 

PROVIDER: S-EPMC4842989 | biostudies-literature | 2016 Apr

REPOSITORIES: biostudies-literature