COLLABORATIVE RESEARCH: Magma Reservoir-Conduit Dynamics Revealed by Borehole Geophysical Observatory and Continuous GPS

合作研究：钻孔地球物理观测站和连续 GPS 揭示的岩浆储层-管道动力学

• 批准号: 0116826
• 负责人: Barry Voight
• 金额: $ 57.1万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-04-15 至 2006-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0116826&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Magma; Reservoir; Conduit

0116826Voight The ongoing eruption of the Soufriere Hills Volcano (SHV) on Montserrat provides an unprecedented opportunity to investigate complex magmatic processes at an andesitic volcano. Growth of the lava dome has been unsteady and accompanied by cyclic patterns of ground deformation, seismicity, and explosive eruptions. The cycles include a short-term scale (6-18 hour), a meso-term scale (~7 weeks), and a long-term scale (~30 y). They provide insights into eruption dynamics at andesite volcanoes, with the short-term cycles suggesting that degassing, rheological stiffening of the magma, and pressurization in the upper conduits are coupled and control many of the geophysical and dynamical phenomena observed. The meso- and long- term cycles may reflect deep-seated processes involving the magma reservoir. This project will investigate the dynamics of the full system using an integrated array of specialized instruments in four strategically located 200-m boreholes, and several shallower holes, surrounding SHV. The system is active and dynamic and will remain so for the foreseeable future. Analysis of the continuous perishable data provided by these instruments should provide important new insights and specific constraints to theoretical models, involving the dynamic behavior of the andesite magmatic system.This is a collaborative project involving P.I.s from Penn State University, Carnegie Institution of Washinton, University of Arkansas, in collaboration with Montserrat Volcano Obervatory (MVO) and scientists from Bristol and Leeds Universities in the UK. The UK investigators have been funded to share drilling costs and to support UK scientific analyses. The expertise, facilities, and database of MVO also provide cost-share contributions.***

0116826Voight 蒙特塞拉特岛苏弗里埃尔山火山 (SHV) 的持续喷发为研究安山质火山的复杂岩浆过程提供了前所未有的机会。 熔岩穹丘的增长一直不稳定，并伴随着地面变形、地震活动和爆炸性喷发的循环模式。 这些周期包括短期规模（6-18 小时）、中期规模（~7 周）和长期规模（~30 年）。 它们提供了对安山岩火山喷发动力学的见解，短期循环表明岩浆的脱气、流变硬化和上部管道的加压是耦合的，并控制着观察到的许多地球物理和动力学现象。 中观和长期循环可能反映涉及岩浆库的深层过程。 该项目将在 SHV 周围的四个战略位置 200 米钻孔和几个较浅的钻孔中使用集成的专用仪器阵列来研究整个系统的动力学。 该系统是活跃且动态的，并且在可预见的未来仍将如此。 对这些仪器提供的连续易腐数据的分析应该为理论模型提供重要的新见解和具体约束，涉及安山岩岩浆系统的动态行为。这是一个合作项目，涉及宾夕法尼亚州立大学、华盛顿卡内基研究所、大学的 P.I.阿肯色州与蒙特塞拉特火山天文台（MVO）以及英国布里斯托尔大学和利兹大学的科学家合作。 英国调查人员已获得资助来分担钻探成本并支持英国的科学分析。 MVO 的专业知识、设施和数据库也提供成本分摊贡献。***