|The 2009 Samoa–Tonga great earthquake triggered doublet|
|Lay, T.; Ammon, C.J.; Kanamori, H.; Rivera, L.; Koper, K.D.; Hutko, A.R. (2010). The 2009 Samoa–Tonga great earthquake triggered doublet. Nature (Lond.) 466(7309): 964-968|
|In: Nature: International Weekly Journal of Science. Nature Publishing Group: London. ISSN 0028-0836, more|
Earthquakes; ISE, Tonga; Marine
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On 29 September 2009, a tsunami devastated the Samoan and northern Tongan islands. Here, an unusual earthquake sequence that preceded this tsunami is analysed. A magnitude-8.1 intraplate faulting event in the outer trench-slope at the northern end of the Tongan subduction zone was followed by extensive interplate faulting, with total moment equivalent to that of a magnitude-8.0 earthquake. Overlap of the seismic signals had obscured the fact that distinct faults had ruptured with different geometries.