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.***

蒙特塞拉特岛苏弗里埃山火山（SHV）的持续喷发为研究安山质火山复杂的岩浆过程提供了前所未有的机会。 熔岩穹丘的增长是不稳定的，并伴随着地面变形、地震活动和爆炸性喷发的周期性模式。 周期包括短期尺度（6-18小时）、中期尺度（~7周）和长期尺度（~30年）。 他们提供的见解喷发动力学在安山岩火山，短期周期表明，脱气，流变硬化的岩浆，并在上部管道加压耦合和控制许多观察到的地球物理和动力学现象。 中、长期旋回反映了岩浆库的深部过程。 该项目将调查整个系统的动态使用一个集成阵列的专业仪器在四个战略位置的200米钻孔，和几个浅孔，周围SHV。 该系统是活跃和有活力的，在可预见的未来将继续如此。 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，阿肯色州大学，与蒙特塞拉特火山观测所（MVO）以及来自英国布里斯托和利兹大学的科学家合作。 英国调查人员已获得资助，以分担钻井费用并支持英国的科学分析。 流动志愿人员组织的专门知识、设施和数据库也提供分摊费用的捐助。