Collaborative Research: The CALIPSO Project: Imaging the Magma Chamber on Montserrat

该奖项为位于威斯康星州蒙特塞拉特市的CALIPSO项目(加勒比海安山岩熔岩岛精密地震大地测量观测站)提供续签支持。该项目的最终目标是研究苏弗里尔山火山(SHV)整个岩浆系统的动力学，并加强我们对安山岩岩浆动力学的一般性理解。该项目于2002年启动，在SHV周围钻探和安装了四个高灵敏度钻孔(200米深)地震和地面形变(应变仪、倾斜仪、CGPS)台站。这是安山岩火山上第一个也是唯一一个这样的仪器钻孔网络。该项目涉及六个美国机构(亚利桑那州立大学、阿肯色州州立大学、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)、英国的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)。主要资金(约200万美元)来自NSF(大陆动力和I/F)，英国提供了一笔捐款。安装工作在2004年完成，恢复了重要的仪器数据，包括2003年巨大的熔岩穹顶坍塌、2003-2005年的爆炸和2005年重新启动的穹顶生长(Mattioli等人，2004年，2005年；Voight等人)。等人，2005年)。到目前为止，PI的努力必然集中在设施和数据传输问题上，但他们对数据的初步研究有望获得关于岩浆系统的相当重要的见解(Voight等人)。2005)。PIS认为，正在收集的数据具有前所未有的价值，他们的分析是基于科学基础的，也是为了支持NSF在开发CALIPSO设施方面所做的大量投资。CALIPSO项目增加的一个新方向是SEA-CALIPSO实验，这是一个涉及气枪震源地震实验的扩展。这是一个“陆上-近海”的地震实验，以成像蒙特塞拉特SHV下的岩浆室和深部地壳。这项实验的数据采集阶段将于2007年进行，由国家地球物理学研究所和英国国家环境研究委员会共同支持(见通信)。本奖项为在SEA-CALIPSO获得的数据提供分析和建模研究阶段的支持。具体地说，该奖项支持：(1)分析涉及应变仪、CGPS、倾斜、地震和其他数据集的钻孔(和辅助地面仪器)数据，包括校准和建模工作，以推断岩浆系统及其扰动的物理特征(例如，新的岩浆流入、爆炸)；(2)对SEA-CALIPSO数据(以气枪测量为中心的~100台PASSCAL地震记录仪记录的3-4个月的气炮和地震数据集)进行完整的分析、模拟和解释，以产生岩浆系统的层析和反射成像；(3)将钻孔观测站分析、层析成像信息与变形和流体力学模拟联系起来；(4)为协调研究规划举办及时的团队讲习班；(5)进行教育宣传，并交流研究成果。

0607782MattioliThis award provides renewal support for the CALIPSO Project (Caribbean Andesitic Lava Island Precision Seismo-geodetic Observatory) on Montserrat, WI. The ultimate goal of this project is to investigate the dynamics of the entire magmatic system of Soufriere Hills Volcano (SHV), and to enhance our generic understanding of andesitic magma dynamics.The project was initiated in 2002 with drilling and installation of four high-sensitivity borehole (200-m deep) seismic and ground deformation (strainmeter, tiltmeter, cGPS) stations around the SHV. This is the first and only such instrumented borehole network at any andesite volcano. The project involves six US institutions (Arizona State U, U Arkansas, Carnegie Institution of Washington, Cornell, Duke, Penn State), Bristol and Leeds universities in the UK, and the Montserrat Volcano Observatory (MVO). Principal funding (ca. 2 million USD) was from NSF (Continental Dynamics, and I/F), with a contribution from UK. The installations were completed by 2004, and important instrumental data have been recovered, including those from a prodigious lava dome collapse in 2003, explosions in 2003-5, and restarted dome growth 2005 (Mattioli et al., 2004, 2005; Voight et. al., 2005). The PI's efforts to date have focused necessarily on facility and data transfer issues, but their initial research on the data promises quite important insights on the magmatic system (Voight et al. 2005). The PIs argue that the data being collected are of unprecedented value, and their analysis is merited on scientific grounds as well as to support the considerable investment NSF has made in developing the CALIPSO facility. A new direction added to the CALIPSO Project is the SEA-CALIPSO experiment, an extension involving a Seismic Experiment with Airgun- source. This is an 'onshore - offshore' seismic experiment to image the magma chamber and deep crust underlying the SHV on Montserrat. The data acquisition phase of this experiment will be carried out in 2007, with combined support of NSF (Geophysics) and the National Environmental Research Council (NERC) of the UK (see correspondence). Support for the analysis and modeling research phase for the data acquired in SEA-CALIPSO is being provided in this award.Specifically, this award provides support for: (1) analyses of borehole (and ancillary surface instrument) data involving strainmeter, cGPS, tilt, seismic and other datasets, including calibrations and modeling efforts, to deduce the physical characteristics of the magma system and its perturbations (e.g. new magma influx, explosions); (2) complete analysis, modeling and interpretation of SEA-CALIPSO data (airgun and earthquake data set recorded by ~100 PASSCAL seismic recorders for a 3-4 month period centered on the airgun survey) to generate tomographic and reflection imaging of the magmatic system;(3) linkage of the borehole observatory analyses, tomographic imaging information, and deformation and fluid mechanic modeling;(4) timely team workshops for coordinated planning of the research; (5) educational outreach, and communication of research results.