Earthquakes that took place every 25 minutes for a year in an Antarctic ice sheet have enhanced researchers’ understanding of other stick-slip earthquakes, such as those which occur in Haiti.
During 2002 and 2003, the David Glacier experienced around 20,000 earthquakes at regular intervals.
Research indicates that an area of exposed bedrock under the glacier was causing the ice to stick, allowing stress to build up for 20-30 minutes before the ice slipped, causing a quake.
Researchers were surprised to discover that the variation in time frame was due to tidal effects acting at the edge of the glacier.
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