Source rupture process of the Papua New Guinea earthquake of July 17, 1998 inferred from teleseismic body waves
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- Kikuchi Masayuki
- Earthquake Research Institute, University of Tokyo
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- Yamanaka Yoshiko
- Earthquake Research Institute, University of Tokyo
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- Abe Katsuyuki
- Earthquake Research Institute, University of Tokyo
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- Morita Yuichi
- Earthquake Research Institute, University of Tokyo
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抄録
A large earthquake (Ms 7.1) occurred off northwest coast of Papua New Guinea (PNG), and a massive tsunami attacked villages to cause a devastating damage. In an attempt to ascertain the tsunami source, we investigate the source rupture process using teleseismic data at IRIS network as well as local data at Jayapura, Irian Jaya, station. The source parameters obtained are: (strike, dip, slip) = (301°, 86°, 91°); the seismic moment = 4.3 × 1019 Nm (Mw = 7.0); the duration of main rupture = 19 s; the centroid depth = 20 ± 5 km; the extent of rupture along the fault strike = 40 km; the average dislocation = 1.8 m; the stress drop = 7.3 MPa. The tsunami magnitude Mt determined from tide-gage data at long distance is 7.5, significantly larger than Ms, so that the PNG earthquake is characterized as a tsunami earthquake. Tsunami earthquakes might have been caused by slow rupture, submarine landslide, and high-angle dip-slip. Our teleseisimic analysis precludes the first two candidates and favors the third one as a source of the present earthquake, although it does not necessarily exclude the possibility of an aseismic landslide induced by the main shock or its aftershocks.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 51 (12), 1319-1324, 1999
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681486293632
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- NII論文ID
- 10004337923
- 130003955971
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 4986210
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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