Mainshock and Aftershocks of the M 9.0 Indonesia Earthquake
of December 26, 2004

This map shows the mainshock and 24 aftershocks that occurred within 24 hours.  The aftershocks indicate that the mainshock rupture progressed about 1,200 km to the north.  At a typical rupture speed of about 3 km/s, this event probably took between 6 and 7 minutes to fully rupture this portion of the plate boundary.

Notes:  This map was created with Alan Jones' Seismic Eruption program.  The earthquakes were obtained from the file on the USGS anonymous FTP site with events from the past two weeks in the format used by SeismicEruption.  This file is: ftp://ghtftp.cr.usgs.gov/pub/cnss/merge_14.hyr

Back