SAFETY PERFORMANCE OF DAMS IN CHILE’S HIGHLY SEISMIC ENVIRONMENT


Figure 4. Earthquakes measuring M ≥ 7.5 which have occurred since 1850


2.2 Recent large earthquakes 2.2.1 Maule earthquake, 2010


On 27th February 2010, at 3:34 a.m. local time, a mega-earthquake measuring Mw = 8.8 hit the Central-Southern region of Chile. A series of aftershocks followed the initial earthquake;


the most important, Mw = 6.2, occurred 20 minutes after the main shock. The Maule earthquake corresponds to a thrust faulting type, or interplate, occurring at an average depth of 30km.


The rupture zone responsible for this earthquake covered a rectangular area of approximately 550km x 170km. The southern end of the rupture zone overlapped the rupture zone of the


1960 Valdivia earthquake of magnitude Mw = 9.5 and stopped near the southern end of the 1985 Valparaíso earthquake measuring Mw = 8.0[4].


Table 1. Earthquakes measuring M ≥ 7.5 which have occurred since 1850


Vol XXXI Issue 3


DAM ENGINEERING


189


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