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

0607782Mattioli 该奖项为位于威斯康星州蒙特塞拉特的 CALIPSO 项目（加勒比安山熔岩岛精密地震大地观测站）提供更新支持。该项目的最终目标是研究苏佛里耶尔火山 (SHV) 整个岩浆系统的动力学，并增强我们对安山岩浆动力学的一般了解。该项目于 2002 年启动，在 SHV 周围钻探并安装了四个高灵敏度钻孔（200 米深）地震和地面变形（应变计、倾斜计、cGPS）站。 这是安山岩火山中第一个也是唯一一个配备仪器的钻孔网络。 该项目涉及六所美国机构（亚利桑那州立大学、阿肯色大学、华盛顿卡内基研究所、康奈尔大学、杜克大学、宾夕法尼亚州立大学）、英国布里斯托大学和利兹大学以及蒙特塞拉特火山观测站（MVO）。主要资金（约 200 万美元）来​​自 NSF（Continental Dynamics 和 I/F），英国也提供了捐款。安装工作于 2004 年完成，重要的仪器数据也已恢复，包括 2003 年巨大的熔岩穹顶塌陷、2003 年 5 月的爆炸以及 2005 年穹顶重新增长的数据（Mattioli 等人，2004 年、2005 年；Voight 等人，2005 年）。迄今为止，PI 的工作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对岩浆系统产生相当重要的见解（Voight 等人，2005 年）。 PI 认为，所收集的数据具有前所未有的价值，他们的分析具有科学依据，并支持 NSF 在开发 CALIPSO 设施方面进行的大量投资。 CALIPSO 项目中添加的一个新方向是 SEA-CALIPSO 实验，这是涉及气枪源地震实验的扩展。这是一项“陆上 - 海上”地震实验，旨在对蒙特塞拉特岛 SHV 下方的岩浆房和深层地壳进行成像。 该实验的数据采集阶段将于 2007 年进行，并得到 NSF（地球物理学）和英国国家环境研究委员会（NERC）的联合支持（见通信）。 该奖项为SEA-CALIPSO中获取的数据的分析和建模研究阶段提供支持。具体来说，该奖项为以下方面提供支持：（1）对涉及应变计、cGPS、倾斜、地震和其他数据集的钻孔（和辅助表面仪器）数据进行分析，包括校准和建模工作，以推断岩浆系统的物理特征及其扰动（例如新的岩浆流入、爆炸）； (2) 完成 SEA-CALIPSO 数据的分析、建模和解释（以气枪勘测为中心，约 100 个 PASSCAL 地震记录仪记录了 3-4 个月的气枪和地震数据集），以生成岩浆系统的层析和反射成像；(3) 钻孔观测站分析、层析成像信息以及变形和流体力学建模的联系；(4) 及时召开团队研讨会，协调规划研究； (5) 教育推广和研究成果交流。

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.