Entrance of Pyroclastic Flows into the Sea from Montserrat Island Lesser Antilles

最近在小安的列斯群岛蒙特塞拉特的火山活动，由于生长中的安山岩圆顶崩塌，导致火山碎屑流的产生。一些水流具有足够的流动性，可以在海面上流动，而另一些水流则在浅水中剧烈地相互作用。在该岛的东海岸正在建造一个三角洲，并在离海岸3公里的地方测量了150米的浅滩。该项目将在为期九天的海洋地质调查中研究这些流动，使用侧扫声纳，Chirp II和气泡脉冲发生器系统，从当地的海图船上。这些结果将有助于更好地理解火山碎屑流的沉积机制和海洋环境中形成的沉积物类型。

Recent volcanic activity on Monteserrat in the Lesser Antilles has led to generation of pyroclastic flows by the collapse of growing andesitic dome. Some flows have been sufficiently mobile to have traveled over the sea surface while other parts interact explosively in shallow water. A delta is being constructed on the east coast of the island and shoaling of 150 m at a distance of three km offshore has been measured. The project will study these flows during a nine-day marine geological survey using side-scan sonar, Chirp II and bubble pulser system, from a locally charted vessel. The results will lead to better understanding of the depositional mechanisms of pyroclastic flows and the types of deposits that form in the marine environment.