Collaborative Research: Near-Field Volcano Infrasound: Three-dimensional Seismo-Acoustic Wave Propagation

合作研究：近场火山次声波：三维地震声波传播

• 批准号: 0738802
• 负责人: Jeffrey Johnson
• 金额: $ 17.74万
• 依托单位: New Mexico Institute of Mining and Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-06-15 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0738802&HistoricalAwards=false
• 关键词: Collaborative; Research; Near; Field; Volcano

A detailed, realistic program to model three-dimensional, seismo-acoustic wave propagation from an exploding volcano in the near field is achieved by combining theoretical calculations and field observations. A test of theoretical predictions based on models of wind shear and topographic effects is established by recording explosions on a 15 station 30 element array at Tungurahua Volcano, Ecuador. Full waveform simulations with realistic representations of three-dimensional distributions of topography are used to model acoustic wave propagation in the atmosphere as well as elastic wave propagation in the earth. For explosions, source time functions may be derived from acoustic waves to deconvolve source effects from hi-fidelity seismic wave recordings. Seismic signals are used to extract detailed geologic structure in the volcano edifice and conduit, as well as physical parameters such as melt percentage, viscosity, and partitioning of gas-fluid-solid phases.

通过理论计算和现场观测相结合，实现了一个详细的、现实的程序来模拟从火山爆发的近场中的三维地震声波传播。通过在厄瓜多尔通古拉瓦火山15站30元台阵上记录爆炸，对基于风切变和地形效应模型的理论预测进行了检验。全波形模拟与三维地形分布的真实表示被用来模拟声波在大气中的传播以及弹性波在地球中的传播。对于爆炸，可以从声波获得震源时间函数，以从高保真地震波记录中去卷积震源效应。地震信号被用来提取火山建筑物和管道中的详细地质结构，以及熔体百分比、粘度和气液固三相分配等物理参数。