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A major earthquake that hit Chile in February 2010 (star marks epicenter) did not relieve seismic stress in a region known as the "Darwin gap" that lies between areas hit by quakes in 1928 and 1960.
Credit: R. Stein, Lorito et al/Nature Geoscience 2011
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1. 1928 Eq. was ~M=8. very small and nothing compared to Maule 2010 Mw=8.8. there's no way that 2010 can be the repeat of 1928 and the ruptures of similar sizes.
2. in the south, Lorito doesn't seem to know that 1960 were actually TWO (2) earthquakes: the big one (Mw 9.5) and a Mw ~8.5 in the northern part of the main shock rupture, precisely around Arauco.
3. they use the USGS epicenter we know is offset (to the north) by 50km
4. the slip distribution they get is not well constrained. it is wrong.
in conclusion: The Maule earthquake is a Mw 8.8. roughly speaking thats 8 meters of average slip on a 500 km long fault. Nothing comparable to 1928. on the contrary, it seats very well between 1960 earthquakeS in the south and 1906 in the north. 8 m of average slip also fits well with 7 cm/yr (the plate tectonics velocity) of accumulation over 175 year since 1835 (12m) (don't forget we'll have a few years of post-seismic which will add a few meters of deformation).
the 1835 Darwin gap is gone.
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