Mystery of Slow Earthquakes Solved?


2009 Earthquakes Located by the NEIC
2009 Earthquakes Located by the NEIC (Photo credit: Wikipedia)

Mystery of Slow Earthquakes Solved?.

Richard A. Lovett

for National Geographic News

Published December 9, 2010

For years scientists have known about slow earthquakes—temblors that last days, weeks, or even months.

But do these creeping quakes increase or decrease the threat of „regular“ earthquakes—the big, quick kind? A new study may hold a key to the answer. (See earthquake pictures.)

Read more please …

Until now seismologists have been aware of two major types of slow earthquake, deep and shallow. (Video: Earthquake 101.)

Deep slow earthquakes occur about 18 to 24 miles (30 to 40 kilometers) underground and last several minutes to several days. They produce tiny tremors, each no stronger than 1 or 2 on the magnitude moment scale, which measures earthquakes based on the seismic-wave energy they release.

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