|Near-simultaneous great earthquakes at Tongan megathrust and outer rise in September 2009|
|Beavan, J.; Wang, X.; Holden, C.; Wilson, K.; Power, W.; Prasetya, G.; Bevis, M.; Kautoke, R. (2010). Near-simultaneous great earthquakes at Tongan megathrust and outer rise in September 2009. Nature (Lond.) 466(7309): 959-963|
|In: Nature: International Weekly Journal of Science. Nature Publishing Group: London. ISSN 0028-0836, more|
Earthquakes; ISE, Tonga; Marine
|Authors|| || Top |
On 29 September 2009, a tsunami devastated the Samoan and northern Tongan islands. It is shown here that an unusual earthquake sequence preceded this tsunami. A magnitude-8 earthquake in the outer-rise intraplate region occurred almost simultaneously with rupture of the shallow subduction interplate interface, equivalent to a magnitude-8 earthquake. The findings provide information on strain release mechanisms at subduction zones, and a possible mechanism for the occasional large tsunamis generated at the Tonga subduction zone.