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Highly variable recurrence of tsunamis in the 7400 years before the 2004 Indian Ocean tsunami

机译:在2004年印度洋海啸发生之前的7400年中海啸的高度可变复发

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摘要

The devastating 2004 Indian Ocean tsunami caught millions of coastal residents and the scientific community off-guard. Subsequent research in the Indian Ocean basin has identified prehistoric tsunamis, but the timing and recurrence intervals of such events are uncertain. Here we present an extraordinary 7,400 year stratigraphic sequence of prehistoric tsunami deposits from a coastal cave in Aceh, Indonesia. This record demonstrates that at least 11 prehistoric tsunamis struck the Aceh coast between 7,400 and 2,900 years ago. The average time period between tsunamis is about 450 years with intervals ranging from a long, dormant period of over 2,000 years, to multiple tsunamis within the span of a century. Although there is evidence that the likelihood of another tsunamigenic earthquake in Aceh province is high, these variable recurrence intervals suggest that long dormant periods may follow Sunda megathrust ruptures as large as that of the 2004 Indian Ocean tsunami.
机译:2004年毁灭性的印度洋海啸使数百万沿海居民和科学界措手不及。随后在印度洋海盆的研究已经确定了史前海啸,但此类事件的发生时间和复发间隔尚不确定。在这里,我们展示了印度尼西亚亚齐沿海洞穴中史前海啸沉积的异常7400年地层序列。该记录表明,在7400到2900年前之间,至少有11个史前海啸袭击了亚齐海岸。海啸之间的平均时间间隔约为450年,间隔时间从2000年以上的长期休眠期到一个世纪之内的多次海啸。尽管有证据表明亚齐省发生另一场海啸的可能性很高,但这些可变的复发间隔表明,Sun达大推力破裂后的休眠期可能长于2004年印度洋海啸。

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