EMSC
European Mediterranean Seismological Centre
| On March 28, at 16:09 UTC an
earthquake with a preliminary
magnitude of 8.6 struck Northern Sumatra. A magnitude
8.6 earthquake generates a rupture length of typically
500 kilometers and a displacement of several meters. Although
it is a massive earthquake, the energy
released is 10-15 times smaller than during the December
26th, 2004 event. The epicentre is located approximately 200km SE of the December 26th 2004 epicentre. This event has generated a moderate tsunami much less destructive than the one generated by the December 26th event. Locally, wave have been estimated up to 4-5 meters and amplitude up to 2m have been recorded. In the Indian Ocean, amplitudes have been measured up to 50 cm. The aftershock activity is expected to last several weeks. Waves measuring a maximum height of 2.3 meters (7.6 feet) were recorded in seas near Kirinda in southern Sri Lanka. Smaller waves up to 0.5 meters (1.65 feet) tall also brushed the coastline in the capital Colombo on the west coast of the island. The waves were recorded at both locations approximately three hours after the earthquake. Remy Bossu (EMSC) : bossu@emsc-csem.org (08/04/2005 12:00 UTC)Special page on Mw 9.3 in Northern Sumatra 26/12/2004 |
|
| Since 28/03/2005
16:09 UTC |
Since 26/12/2004 |
| New pattern in
aftershocks distribution on April 10th ! The seismicity moved 400 km to the South-East  Mw 8.6 28/03/2005 main shock information Aftershocks Distribution since 28/03/2005 Aftershocks Statistics |
 Mw 9.3 26/12/2004 main shock information Aftershocks Distribution since 26/12/2004 |
 Harvard Moment Tensors (since 28/03/2005) |
 Harvard Moment Tensors (From 26/12/2004 to 28/03/2005) |
 USGS Moment Tensors (since 28/03/2005) |
 USGS Moment Tensors (From 26/12/2004 to 28/03/2005) |
If you have relevant information to share,
please mail to bossu@emsc-csem.org or mazet@emsc-csem.org
These information will be compiled and accessible on this web site.