International Tsunami Survey Team (ITST) in PNG from 31 July to 7 August 1998

Member

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Benson,USA; Borrero,USA;Jose Borrero, Univ. Southern Calif., USA; Willem de Lange, University of Waikato, NZ; Koji Fujima, National Defence Academy, JPN; Fumihiko Imamura, Tohoku University, JPN; Yoshiaki Kawata, Kyoto University, JPN; Masashi Matsuyama, CRIEPI, JPN; Hideo Matsutomi, Akita University, JPN; Jonathan Nott, James Cook University, Australia; Emil Okal, The Northwestern University, USA; Costas E. Synolakis, Univ. Southern Calif., USA; Tomoyuki Takahashi, Kyoto University, JPN ; Yoshinobu Tsuji, Univ.Tokyo, JPN

Abstract of PNG Tsunami Investigation

The first investigation on the tsunami caused by the earthquake offshore northwestern coast of the Papua New Guinea (PNG) was carrired out by the International Tsunami Survy Team (ITST) during the period of 31 July to 7 August 1998. The survey to the damaged area confirmed the 7 - 10 m wave reported and found the place where the waves were larger - up to 15 m. The severe damage and extreme wave heights were confined to a relatively short (30 km) stretch of coast between Aitape and Sissano Villages and specially large along the sandbar the outer margin of Sissano Lagoon.

Itineray

The survey was conducted by a multinational team with representatives from Japan, the United States, Australia, and New Zealand. The team was broken up into two groups, the Japanese and everyone else. The Japanese team traveled overland from Wewak to Aitape measuring runup along the way. Japanese team members also installed seismograms in the region (Wewak, Lumi and Vanimo) to measure aftershock activity. The rest of the team traveled by ship from Wewak to the west stopping at some of the offshore islands. The two groups reunited in Aitape before a survey of the Sissano area was conducted. The boat continued west as far as Serai Village where runup values were seen to diminish considerably.