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Limited overlap between the seismic gap and coseismic slip of the great 2010 Chile earthquake

Lorito, S., Romano, F., Atzori, S., Tong, X., Avallone, A., McCloskey, J., Cocco, M., Boschi, E. and Piatanesi, A. (2011) Limited overlap between the seismic gap and coseismic slip of the great 2010 Chile earthquake. NATURE GEOSCIENCE, 4 (3). pp. 173-177. [Journal article]

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DOI: 10.1038/NGEO1073


The M(w) 8.8 mega-thrust earthquake and tsunami that occurred on 27 February 2010 offshore the Maule region, Chile, was not unexpected. A clearly identified seismic gap(1-13) existed in an area where tectonic loading has been accumulating since the great 1835 earthquake1(4). Here we jointly invert tsunami and geodetic data to derive a robust model for the coseismic slip distribution and induced coseismic stress changes. We compare these with past earthquakes and the preseismic locking distribution(13), to assess if the Maule earthquake has filled the seismic gap. We find that the main slip patch is located to the north of the gap, overlapping the rupture zone of the M(w) 8.0 earthquake that occurred in 1928, with a secondary concentration of slip to the south. The seismic gap was only partially filled and a zone of high preseismic locking remains unbroken, inconsistent with the assumption that distributions of seismic rupture might be correlated with preseismic locking. Moreover, we conclude that increased stress on the unbroken patch may in turn have increased the probability of another major to great earthquake there in the near future.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences > School of Geography and Environmental Sciences
Faculty of Life and Health Sciences
Research Institutes and Groups:Environmental Sciences Research Institute
ID Code:23159
Deposited By: Mrs Linda Allen
Deposited On:27 Aug 2012 09:11
Last Modified:04 Oct 2017 16:04

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