Global Seismicity and Unusual Earthquakes

February 7, 2007
Earth Science Colloquium, 2007


Earth and Environmental Sciences
Lamont Doherty Earth Observatory

Application of a new technique based on array processing of long-period data from the Global Seismographic Network has recently led to the discovery of hundreds of previously unreported earthquakes in the magnitude-5 range, many of which have unusual characteristics. The most surprising group of new earthquakes so far is spatially associated with rapidly moving glaciers and may represent sudden sliding or rapid internal deformation of the glaciers. Other "new" events may represent subaereal and submarine gravitational sliding, volcanic collapse, and perhaps even slow earthquakes on regular faults.