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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Emplacement of pyroclastic deposits offshore Montserrat: Insights from 3D seismic data
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Emplacement of pyroclastic deposits offshore Montserrat: Insights from 3D seismic data

机译：蒙特塞拉特海上火成碎屑沉积物的位置：3D地震数据的见解

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During the current (1995-present) eruptive phase of the Soufriere Hills volcano on Montserrat, voluminous pyroclastic flows entered the sea off the eastern flank of the island, resulting in the deposition of well-defined submarine pyroclastic lobes. Previously reported bathymetric surveys documented the sequential construction of these deposits, but could not image their internal structure, the morphology or extent of their base, or interaction with the underlying sediments. We show, by combining these bathymetric data with new high-resolution three dimensional (3D) seismic data, that the sequence of previously detected pyroclastic deposits from different phases of the ongoing eruptive activity is still well preserved. A detailed interpretation of the 3D seismic data reveals the absence of significant (＞3 m) basal erosion in the distal extent of submarine pyroclastic deposits. We also identify a previously unrecognized seismic unit directly beneath the stack of recent lobes. We propose three hypotheses for the origin of this seismic unit, but prefer an interpretation that the deposit is the result of the subaerial flank collapse that formed the English's Crater scarp on the Soufriere Hills volcano. The 1995-recent volcanic activity on Montserrat accounts for a significant portion of the sediments on the southeast slope of Montserrat, in places forming deposits that are more than 60 m thick, which implies that the potential for pyroclastic flows to build volcanic island edifices is significant.
机译：在蒙特塞拉特岛Soufriere Hills火山的当前（1995年至今）喷发阶段，大量的火山碎屑流进入该岛东部侧面的海面，导致海底火山碎屑裂片的沉积。先前报道的测深调查记录了这些沉积物的顺序构造，但无法成像其内部结构，基底的形态或范围或与下伏沉积物的相互作用。通过将这些测深数据与新的高分辨率三维（3D）地震数据相结合，我们表明，来自正在进行的喷发活动不同阶段的火山碎屑沉积物的先前探测序列仍然得到了很好的保存。对3D地震数据的详细解释表明，海底火山碎屑沉积物的远侧范围内没有明显的（> 3 m）基底侵蚀。我们还将在最近的裂片叠层的正下方识别出以前未被识别的地震单元。我们对此地震单元的起源提出了三个假设，但更倾向于一种解释，认为该沉积物是由于苏尔弗里尔山火山上的英国火山口陡坡而导致的地下侧面崩塌的结果。 1995年在蒙特塞拉特（Montserrat）的火山活动占蒙特塞拉特（Montserrat）东南坡上沉积物的很大一部分，这些地方形成的沉积物厚度超过60 m，这意味着火山碎屑流建造火山岛建筑物的潜力很大。 。

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