Clues to prehistoric earthquakes?


  • Anonymous


A record of ancient earthquakes that extends over thousands of years may be ‘frozen’ into sediments of natural lakes, according to a recent issue of the U.S. Geological Survey's Earthquake Information Bulletin.

‘… historic records of earthquakes are too short to allow a true assessment of recurrence intervals; therefore a method has been needed that will enable the seismic history of a region to be extended beyond the limit of historic time,’ writes John Sims of the USGS Menlo Park, California, office. ‘One place where a record of ancient seismic history might be preserved is in lake sediments’.