The Wayback Machine - https://web.archive.org/web/20120717104438/http://staff.aist.go.jp/kenji.satake/Sumatra-E.html
Japanese
| December 26 Tsunami
in Indian Ocean
| |
The great earthquake (Mw 9.0) of December 26 off Sumatra generated the tsunami
in the Indian Ocean. According to
U.S.G.S.
, the aftershocks extended as far as 1,000 km toward north (the red
circles indicate aftershocks occurred within 24 hours). Assuming that the
aftershock area represents the tsunami source, the tsunami propagation was
computed.
Tsunami Travel Time (Hours)
Tsunami Travel Time (in hours) for the entire Indian Ocean
The above figures show that the tsunami reaches Phuket and Sri Lanka coasts
in two hours after the earthquake, and African coast in 8-11 hours.
The tsunami propagation is also animated (up to 5 hours) from a 1200 km fault.
The red color means that the water surface is higher than normal, while the blue
means lower. It indicates that initial tsunami to the east (e.g., Phuket) began
with receding wave, while to the west (e.g., Sri Lanka) large wave suddenly
reached. The darker the color, the larger the amplitude. The tsunamis were
larger in the east and west directions.
Click Here for Animation
Back