Earthquake in Chile: A complicated fracture

The extremely strong earthquake that struck Chile Feb. 27 was a complicated rupture process, scientists say. Quakes with such magnitude virtually penetrate the entire Earth's crust. After closer analysis of the seismic waves radiated by this earthquake during the first 134 seconds after start of the rupture, the researchers came to the conclusion that only the region around the actual epicentre was active during the first minutes.

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