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27 February 2010, Maule, Chile Earthquake

The February 27, 2010 Earthquake (Mw=8.8) occurred along the Chile trench where the Nazca Plate is subducting beneath the South America Plate. The earthquake ruptured a portion of the plate boundary that previously ruptured a series of earthquakes in 1835, 1928, 1906 and 1985. It occurred adjacent to the 1960 Chile Earthquake (Mw=9.5) rupture zone. The earthquake was well recorded at the Tucson seismic station in the Catalina Mountains, as well as at stations across Arizona. The first P wave arrival reached Tucson just less than 12 minutes after the initiation of the earthquake.

Location Map of the largest earthquakes along the coast of Chile this century (based on Beck et al., 1998)

Space-time plot of large to great earthquakes along the coast of south central Chile

Seismograms from Arizona

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For more information on the 27 February 2010 Maule, Chile earthquake go to: