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Fault geometry of the 2004 off the Kii peninsula earthquake inferred from offshore pressure waveforms

机译：根据离岸压力波形推断的2004年基伊半岛地震的断层几何

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We could successfully obtain water pressure fluctuations after a series of two off the Kii peninsula earthquakes that took place on September 5 in 2004, using two pressure gauges deployed at deep ocean-bottom off Muroto. The earthquakes caused two tsunamis in the southern coast of the southwestern Japan with maximum wave heights of 0.9 m, and we could identify the tsunami signals from the acquired dataset ca. 20 min before the arrivals of the tsunamis to the coastline nearest to the sensors. Two earthquakes are assumed as one for a foreshock and the other for a main-shock. Although seismological studies, without aftershock distributions, showed a lack of constraints to distinguish if the main-shock was caused by either southwest dipping fault or by the other, i.e., northeast dipping fault, we found that the difference in the pressure fluctuations for the tsunamis could attribute to the determination of the fault plane in the fault models. In this paper, we evaluate the fault geometry of the main shock by using tsunami waveforms obtained by those unique instruments in following procedure: (1) We first simulate pressure waveforms caused by earthquakes of the two fault geometries, one for southwest dipping place and the other for the northeast, at the location of the pressure gauges, and (2) we then compare the simulated results with observed waveforms. Our results demonstrate that the main-shock should be caused by a fault whose strike lies in northwest-to-southeast with a dip towards southwest direction.
机译：在2004年9月5日发生的两次纪伊半岛地震之后，我们使用部署在Muroto附近深海底的两个压力计进行了两次地震，成功地获得了水压波动。地震在日本西南部的南部海岸引起了两次海啸，最大波高为0.9 m，我们可以从采集的数据集ca中识别出海啸信号。在海啸到达距离传感器最近的海岸线之前20分钟。假设发生两次地震，一次地震是前震，另一次地震是主震。尽管没有余震分布的地震学研究显示缺乏约束力来区分主震是由西南倾覆断层还是由另一个，即东北倾覆断层引起的，但我们发现海啸的压力波动存在差异可以归因于故障模型中故障平面的确定。在本文中，我们通过以下程序使用这些独特仪器获得的海啸波形来评估主震的断层几何形状：（1）首先模拟由两种断层几何形状的地震引起的压力波形，一个是西南倾角位置，另一是断层。 （2）然后将模拟结果与观察到的波形进行比较。我们的结果表明，主震应该是由断层引起的，其走向位于西北向东南，向西南方向倾斜。

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