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首页> 外文期刊>Pure and Applied Geophysics >T Waves from the 1998 Papua New Guinea Earthquake and its Aftershocks: Timing the Tsunamigenic Slump
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T Waves from the 1998 Papua New Guinea Earthquake and its Aftershocks: Timing the Tsunamigenic Slump

机译:来自1998年巴布亚新几内亚地震及其余震的T波:定时引发海啸

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— T waves recorded at hydrophone and seismic stations following the Papua New Guinea earthquake of 17 July 1998 and its aftershocks show that a small event at 09:02 GMT featured source properties incompatible with an elastic dislocation of appropriate body-wave magnitude (m b=4.4). These include an exceptional duration (47 s at the Wake Island hydrophone station WK31), a spectrum rich in high frequencies (7 to 12 Hz), and a generally low spectral amplitude. These characteristics can be explained by the model of an underwater slump, accelerating from a standstill and eventually slowing down. The relocation of the 09:02 event is compatible with its location within an amphitheater inside which shipboard cruises in 1998 and 1999 documented the presence of a 4 – km3 geologically fresh slump. We propose that the slump took place at 09:02 on 17 July 1998, i.e., 13 minutes after the mainshock, and that it generated the locally catastrophic tsunami, whose properties (amplitude and distribution of runup; timing) could not be explained by a dislocation model.
机译:— 1998年7月17日巴布亚新几内亚地震及其余震在水听器和地震台站记录的T波表明,格林尼治标准时间09:02的一次小事件的震源特性与适当的体波幅值(mb sub> = 4.4)。这些包括异常的持续时间(在Wake Island水听器站WK31处为47 s),富含高频(7至12 Hz)的频谱以及通常较低的频谱幅度。这些特征可以通过水下坍塌模型来解释,该模型从静止状态加速并最终减速。 09:02事件的重新定位与其在圆形剧场内的位置相符,1998年和1999年的舰船巡游记录了4 – km3 地质新低的存在。我们建议这次暴跌发生在1998年7月17日的09:02,也就是主震发生后的13分钟,并且它引起了局部灾难性的海啸,其性质(振幅和分布;时机)无法用a来解释。位错模型。

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