Multiple widespread landslides during the long‐term evolution of a volcanic island: Insights from high‐resolution seismic data, Montserrat, Lesser Antilles
Multiple widespread landslides during the long‐term evolution of a volcanic island: Insights from high‐resolution seismic data, Montserrat, Lesser Antilles
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火山岛长期演化过程中发生的多次广泛的山体滑坡：高分辨率地震数据的见解，蒙特塞拉特岛，小安的列斯群岛
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发表时间：
2011
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通讯作者：
M. Vardy
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作者：
E. Lebas;A. Friant;G. Boudon;Sebastian F. L. Watt;P. Talling;N. Feuillet;C. Deplus;Christian Berndt;Christian Berndt;M. Vardy
新的高分辨率多道地震数据（GWADASEIS-2009和JC 45/46 - 2010巡航;分别为72和60个通道）与以前的数据（AGUADOMAR-1999和CARAVAL-2002;分别为6和24个通道）相结合，可以详细调查小安的列斯群岛蒙特塞拉特火山岛周围的质量消耗过程。7个海底矿床的矿源在蒙特塞拉特的侧翼，3个与附近的卡胡讷海底火山有关。Bouillante-蒙特塞拉特半地堑内最大的存款（约20立方公里）以前没有描述过，可能与蒙特塞拉特中央丘陵火山的侧翼不稳定有关，而其他事件则与较年轻的南苏弗里耶尔丘陵-苏弗里耶尔丘陵火山复合体有关。所有矿床都位于该岛的南部或东南部，由Bouillante‐Montserrat半地堑的断层界定。它们覆盖了周围海底东南四分之一的大部分（1520平方公里），总体积为140平方公里。我们的观察结果表明，Bouillante-蒙特塞拉特半地堑对最大体积沉积物的范围和传播施加控制。我们提出了蒙特塞拉特周围的质量浪费过程的解释类似于小安的列斯群岛南部岛屿发生的情况。
New high‐resolution multichannel seismic data (GWADASEIS‐2009 and JC45/46‐2010 cruises; 72 and 60 channels, respectively) combined with previous data (AGUADOMAR‐1999 and CARAVAL‐2002; 6 and 24 channels, respectively) allow a detailed investigation of mass‐wasting processes around the volcanic island of Montserrat in the Lesser Antilles. Seven submarine deposits have sources on the flanks of Montserrat, while three are related to the nearby Kahouanne submarine volcanoes. The most voluminous deposit (∼20 km3) within the Bouillante‐Montserrat half‐graben has not been described previously and is probably related to a flank instability of the Centre Hills Volcano on Montserrat, while other events are related to the younger South Soufrière Hills‐Soufrière Hills volcanic complex. All deposits are located to the south or southeast of the island in an area delimited by faults of the Bouillante‐Montserrat half‐graben. They cover a large part of the southeast quarter of the surrounding seafloor (∼520 km2), with a total volume of ∼40 km3. Our observations suggest that the Bouillante‐Montserrat half‐graben exerts a control on the extent and propagation of the most voluminous deposits. We propose an interpretation for mass‐wasting processes around Montserrat similar to what has happened for the southern islands of the Lesser Antilles.