Nonparametric Assessment of Aftershock Clusters of the Maule Earthquake Mw = 8.8

[摘要] We study the spatial distribution of clusters associated to the aftershocks of the megathrust Maule earthquake MW 8.8 of 27 February 2010. We used a recent clustering method which hinges on a nonparametric estimation of the underlying probability density function to detect subsets of points forming clusters associated with high density areas. In addition, we estimate the probability density function using a nonparametric kernel method for each of these clusters. This allows us to identify a set of regions where there is an association between frequency of events and coseismic slip. Our results suggest that high coseismic slip is spatially related to high aftershock frequency.

[学科分类] 土木及结构工程学

[关键词] Aftershock distribution;kernel density estimation;nonparametric density-based clustering