BBC News - Chile's long experience of quakes - 0 views
-
It is not possible to predict the time and magnitude of an earthquake, but certain places on the Earth know they are always at risk from big tremors. Chile is one of those places.It lies on the "Ring of Fire", the line of frequent quakes and volcanic eruptions that circles virtually the entire Pacific rim. The magnitude 8.8 event that struck the country at 0634GMT on Saturday occurred at the boundary between the Nazca and South American tectonic plates, just off shore and at a depth of about 35km (20 miles).
-
The Nazca plate, which makes up the Pacific Ocean floor in this region, is being pulled down and under the South American coast. It makes the region one of the most seismically active on the globe. Since 1973, there have been 13 events of magnitude 7.0 or greater.
-
French and Chilean seismologists had recently completed a study looking at the way the land was moving in response to the strain building up as a result of the tectonic collision. Their analysis suggested the area was ripe for a big quake. "This earthquake fills in an identified seismic gap," Dr Roger Musson, who is the British Geological Survey's Head of Seismic Hazard, told BBC News.
- ...3 more annotations...