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首页> 外文期刊>Geophysical Research Letters >Causal link between Quaternary paleoclimatic changes and volcanic islands evolution
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Causal link between Quaternary paleoclimatic changes and volcanic islands evolution

机译：第四纪古气候变化与火山岛演化之间的因果关系

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摘要

Giant landslides and resulting tsunamis represent the main geologic hazards linked to volcanic island evolution. From offshore and onland studies, flank failures have been identified around numerous islands, in most geodynamic contexts. However, the triggering conditions are still poorly understood and several causes may act simultaneously to reach a critical threshold. Here we show that most large volume (> 10 km(3)) landslides occur at glacial stages termination and we propose that a causal relationship between flank collapse of volcanic islands and global climatic changes has existed at least since 900 kyr. Moreover, ages reported here favour the hypothesis that major collapses occurred during the onset of glacial to interglacial transitions when sudden influx of melt water from polar ice caps causes rapid sea level rise. We propose that rapid sea level rise induces enhanced coastal erosion and sudden changes of pore pressure conditions within basal layers, which favour edifice failure.
机译：巨大的滑坡和由此产生的海啸代表了与火山岛演变有关的主要地质灾害。根据海上和陆上研究，在大多数地球动力学背景下，已在许多岛屿周围发现了侧翼破坏。但是，触发条件仍然知之甚少，几种原因可能同时起作用，以达到临界阈值。在这里，我们表明大多数大体积（> 10 km（3））的滑坡都发生在冰川期终结，并且我们提出至少自900年来，火山岛的侧面崩塌与全球气候变化之间存在因果关系。此外，这里报道的年龄支持这样的假说，即当极地冰盖的融水突然涌入导致海平面迅速上升时，在冰川向冰间过渡的过程中发生了严重的崩塌。我们认为，海平面的快速上升会引起海岸侵蚀加剧以及基底层内孔隙压力条件的突然变化，这有利于建筑物的破坏。

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