Source properties of the 1998 July 17 Papua New Guinea tsunami based on tide gauge records
Source properties of the 1998 July 17 Papua New Guinea tsunami based on tide gauge records
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根据验潮仪记录得出的 1998 年 7 月 17 日巴布亚新几内亚海啸的震源特性
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发表时间：
2015
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影响因子：
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通讯作者：
K. Satake
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作者：
M. Heidarzadeh;K. Satake
我们分析了1998年7月17日巴布亚新几内亚（PNG）海啸的四个新检索到的验潮记录，以研究这次海啸的统计和光谱特性。这四个验潮仪记录来自隆布伦（巴布亚新几内亚）、拉包尔（巴布亚新几内亚）、马拉卡勒岛（帕劳）和雅普岛（雅普州），这些测站距离震源600-1450公里。这些测量仪记录到海啸的最大波谷到波峰高度为3-9厘米。频谱分析显示，在2-4和6-20分钟的周期带的两个主要的峰值与一个明确的分离，在1.55分钟的周期。我们解释这些峰值周期属于滑坡和地震的巴布亚新几内亚海啸的来源，分别。海啸波形的分析显示，12- 17分钟的延迟，在滑坡的产生相比，主震的起源时间。包括这个延迟的数值模拟相当地再现了观测到的验潮记录。这是1998年巴布亚新几内亚海啸的延迟滑坡源的第一个直接证据，以前是从声学T相记录间接估计的。
S U M M A R Y We analysed four newly retrieved tide gauge records of the 1998 July 17 Papua New Guinea (PNG) tsunami to study statistical and spectral properties of this tsunami. The four tide gauge records were from Lombrum (PNG), Rabaul (PNG), Malakal Island (Palau) and Yap Island (State of Yap) stations located 600–1450 km from the source. The tsunami registered a maximum trough-to-crest wave height of 3–9 cm at these gauges. Spectral analysis showed two dominant peaks at period bands of 2–4 and 6–20 min with a clear separation at the period of ∼5 min. We interpreted these peak periods as belonging to the landslide and earthquake sources of the PNG tsunami, respectively. Analysis of the tsunami waveforms revealed 12– 17 min delay in landslide generation compared to the origin time of the main shock. Numerical simulations including this delay fairly reproduced the observed tide gauge records. This is the first direct evidence of the delayed landslide source of the 1998 PNG tsunami which was previously indirectly estimated from acoustic T-phase records.