Resumen

MELNICK, Daniel; MORENO, Marcos; CISTERNAS, Marco  y  TASSARA, Andrés. Darwin seismic gap closed by the 2010 Maule earthquake. AndGeo [online]. 2012, vol.39, n.3, pp. 558-563. ISSN 0718-7106.  doi:10.5027/andgeoV39n3-a11.

The Maule earthquake (Mw 8.8) that affected south-central Chile on February 27, 2010 was preceded by the 1835 event documented by FitzRoy and Darwin. The relation between both events has been controversial. Fault slip in 2010 estimated by Lorito et al. (2011) is less than expected from 175 years of strain accumulation, leading them to conclude only limited overlap between the 2010 and 1835 events, and that a Mw 7.5-8 event could still strike the Concepción region. However, Lorito et al. 's model was based on displacements obtained from only 6 GPS stations and underpredicts observations from recent studies. Here we show that an alternative model based on 169 GPS displacements reproduces the data better, suggesting Lorito et al. 's main conclusion is not correct. Based on a slip deficit map, we suggest the seismic gap opened in 1835 was most likely closed in 2010.

Palabras clave : Maule earthquake; Coseismic slip distribution; Slip deficit; Seismic gap.