Collaborative Research: SEA-CALIPSO: An Offshore/Onshore Tomography and Magma-Chamber Seismic Imaging Experiment on Montserrat

位于威斯康星州蒙特塞拉特的CALIPSO项目(加勒比安山岩熔岩精密地震大地观测站)旨在研究苏弗里雷山火山整个岩浆系统的动力学，并提高我们对构成地球火环的安山岩火山的岩浆动力学的了解。其中一个令人兴奋的新组成部分是SEA-CALIPSO实验，它涉及一个气枪震源的地震实验。这是一个“陆上/近海”的地震实验，以成像苏弗里尔山火山的岩浆室和深部地壳。该项目的这一数据获取阶段将在2005年春季进行，联合支持NSF(OISE的地球物理和美洲计划)和英国国家环境研究委员会(NERC)。这个合作项目涉及来自五个美国机构(阿肯色州大学、华盛顿卡内基学院、康奈尔大学、杜克大学、宾夕法尼亚州立大学)、英国布里斯托尔大学和利兹大学以及蒙特塞拉特火山天文台(MVO)的科学家和学生。博伊特教授是该项目的负责人。这家美国组织得到了美国国家科学基金会的支持，而其他组织则得到了英国机构的支持。MVO将为该项目提供数据和关键的后勤支持。该项目需要用一艘英国研究船绕蒙特塞拉特飞行，引发气枪震动，并用~100台IRIS/PASSCAL地震记录仪记录地震波到达和自然地震。部署将持续3-4个月，大约以2005年5月的气枪调查为中心。这些将是关键数据，因为对这些数据集的建模和解释可用于生成岩浆系统的层析成像和反射成像。这项研究将揭示目前正在喷发的安山火山的重要内部特征，对火山学、岩石学和地球化学以及地球物理研究具有重要价值。研究人员预计，在了解岩浆成因和运移以及火山如何运作方面，将取得重大进展。美国有5家机构参与，至少有6名研究生将接受形变和地震建模、陆上/近海地震成像方面的培训，许多本科生将获得研究经验。了解这种岩浆系统的重要性是显而易见的，因为这种类型的火山活动带来了严重的危险，并造成了重大的社会和经济损失。

The CALIPSO Project (Caribbean Andesitic Lava Island Precision Seismo-geodetic Observatory) on Montserrat, WI has aimed to investigate the dynamics of the entire magmatic system of Soufriere Hills Volcano, and to improve our understanding of magma dynamics for andesite volcanoes that make up most of the Earth's Ring of Fire. An exciting new component of this is the SEA-CALIPSO experiment, involving a Seismic Experiment with Airgun-source. This is an 'onshore/offshore' seismic experiment to image the magma chamber and deep crust of Soufriere Hills Volcano. This data acquisition phase of this project will be carried out in Spring 2005, with combined support of NSF (Geophysics and the Americas Program in OISE) and the National Environmental Research Council (NERC) of the UK. This collaborative project involves scientists and students from five US institutions (U Arkansas, Carnegie Institution of Washington, Cornell, Duke, Penn State), Bristol and Leeds universities in the UK, and the Montserrat Volcano Observatory (MVO). Prof. B. Voight is Project Director. The US group is being supported by NSF, whereas the other groups have gained support from UK agencies. The MVO will provide data and key logistical support to the project. The project entails circling Montserrat with a UK research vessel setting off airgun shocks, and recording the seismic wave arrivals, and natural earthquakes, by ~100 IRIS/PASSCAL seismic recorders. The deployment will last for a 3-4 month period centered approximately on the May 2005 airgun survey. These will be critical data, because modeling and interpretation of these datasets can be used to generate tomographic and reflection imaging of the magmatic system. The research will reveal important internal features of a currently erupting andesitic volcano, which is of significant value to the studies of volcanology, petrology and geochemistry, and geophysics. The investigators expect major advances in understanding magma genesis and transport, and 'how volcanoes work'. Five US institutions are involved, and at least six graduate students will be trained in deformation and seismic modeling, onshore/offshore seismic imaging, and many undergraduates will receive research experience. The importance of understanding such magma systems is clear, as this type of volcanism presents serious hazards and causes significant societal and economic damage.