期刊
EARTH-SCIENCE REVIEWS
卷 107, 期 1-2, 页码 66-75出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.earscirev.2011.03.004
关键词
tsunami; earthquake; South Pacific; Samoa; Tonga
资金
- National Science Foundation NSF [OCE-1000694]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0927178, 0960512] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1041541] Funding Source: National Science Foundation
An M(w)approximate to 8.1 earthquake south of the Samoan Islands on 29 September 2009 generated a tsunami that killed 189 people. From 4 to 11 October, an International Tsunami Survey Team surveyed the seven major islands of the Samoan archipelago. The team measured locally focused runup heights of 17 m at Poloa and inundation of more than 500 m at Pago Pago. A follow-up expedition from 23 to 28 November surveying the three main islands of Tonga's northernmost Niua group revealed surprising 22 m runup and 1 km inundation. We analyze the extreme tsunami runup and complex impact distribution based on physical and societal observations combined with numerical modeling. That an outer rise/outer trench slope (OR/OTS) event is responsible for a tsunami disaster in the Pacific calls for care in identifying and defining tsunami hazards. Evacuation exercises conducted in Samoa in the preceding year may have limited the human toll; however, cars were identified as potential death traps during tsunami evacuations. This event highlights the extreme hazards from near source tsunamis when the earthquake's shaking constitutes the de facto warning, and further underscores the importance of community based education and awareness programs as essential in saving lives. (C) 2011 Elsevier B.V. All rights reserved.
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