Enhanced 3-D Tomographic Imaging via Composite Distribution Inverse Theory

CHRISTENSEN本研究的目的是开发并应用复合分布反演技术对火山和工程层析成像问题中的地震资料进行层析反演。工程应用涉及两条钻孔线之间的隧道探测。火山学试验将对棱堡火山下的岩浆室进行成像。这两个问题都提供了出色的三维异常检测目标，这将大大受益于该技术减少的信号模糊。这项研究的成果之一将是一个公开的三维断层扫描程序，它可以适当地处理地形和三维光线追踪问题，这些问题在崎岖地形地区是典型的。改进后的层析成像技术将在地震和火山灾害估计工作中发挥重要作用。这项研究是国家减少地震危害计划的一个组成部分。＊＊＊

9506379 CHRISTENSEN This research is to develop and apply the Composite Distribution Inversion technique to tomographic inversion of seismic data in volcanologic and engineering tomography problems. The engineering application involves tunnel detection between two lines of boreholes. The volcanologic test will be to image magma chambers under the Redoubt volcano. Both problems provide excellent three- dimensional anomaly detection objectives which should benefit greatly from the reduced signal smearing of this technique. One of the products of the research will be a publicly available three- dimensional tomography program which properly handles topography and three-dimensional ray-tracing problems typical of those in areas of rugged terrain. The improved tomographic technique should prove useful in earthquake and volcano hazard estimation work. This research is a component of the National Earthquake Hazard Reduction Program. ***