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

蒙特塞拉特的苏弗里尔山火山(SHV)正在喷发，为研究安山岩火山的复杂岩浆过程提供了前所未有的机会。熔岩穹顶的增长一直是不稳定的，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)、中尺度(~7周)和长期尺度(~30年)。它们提供了对安山岩火山喷发动力学的洞察，短期周期表明，岩浆的脱气、流变性硬化和上层管道的增压是耦合的，并控制了观察到的许多地球物理和动力学现象。中长期旋回可能反映了涉及岩浆储集层的深层过程。该项目将在SHV周围的四个战略位置200米的钻孔和几个较浅的孔中使用一组集成的专门仪器来研究整个系统的动力学。这一系统是活跃的和动态的，并将在可预见的未来保持这种状态。对这些仪器提供的连续易腐烂数据的分析将为涉及安山岩岩浆系统动态行为的理论模型提供重要的新见解和具体约束。这是一个由来自宾夕法尼亚州立大学、卡内基华盛顿研究所、阿肯色大学的P.I.与蒙特塞拉特火山观测站(MVO)以及英国布里斯托尔和利兹大学的科学家合作的项目。英国调查人员获得了资金，以分担钻探成本并支持英国的科学分析。MVO的专门知识、设施和数据库也提供费用分摊贡献。

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.***