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An analysis of satellite data has revealed 37 instances of volcanic responses to regional earthquakes between 2000 and 2006.

Dario Delle Donne at the University of Florence in Italy and his colleagues used data from two NASA satellites to scan for increases in volcanic heat, a measure of volcanic activity, around the world. They compared these results to data from more than 40,000 earthquakes with a magnitude greater than 4.5. For example, they found that the magnitude-9.3 earthquake that hit Sumatra in 2004 led to a worldwide increase in volcanic heat of 300%.

Only about one-third of volcanoes with increased activity were reacting to specific earthquakes, suggesting that volcanic responses to earthquakes depend on many factors, including magnitude, distance from the epicentre and fault orientation.

Geology 38, 771–774 (2010)