Tuesday, February 8, 2011
The New York Times carries an article today about the state of stress in the vicinity of the epicenter of last February's magnitude 8.8 Chile earthquake. Different sources of information - seismic waves, gps, tsunami waves - have yielded somewhat different pictures. The epicenter occurred outside of the 200-mile-long Darwin gap which had not seen a large quake since one that Charles Darwin observed in 1835. Did the occurrence of the 2010 quake lead to a stress increase in this gap, and a higher risk of an upcoming large quake? We have the usual conclusion: more data are needed.