A Study of Crustal Anisotropy in Alaska

9505837怀斯这项研究是为了测量阿拉斯加台网12个三分量地震台站中的大部分记录到的本地地震的S波的偏振方向。重点将放在那些优先矿物取向不太可能导致各向异性的站点上。得到的应力方向将与先前资助的NSF基于断层面解的反演工作中估计的方向进行比较。从S极化来估计应力方向是很重要的，因为没有足够的关于应力方向的信息来了解阿拉斯加中部和南部的地震危险。所有应力方向估计(来自断层面溶液、火山岩、水力裂缝和各向异性)将被整合在一起，以构建阿拉斯加中部和南部的地震构造模型。这项研究是国家减少地震灾害计划的一部分。***

9505837 WYSS This research is to measure the direction of polarization of the S-waves from local earthquakes recorded by most of the 12 three- component seismograph station in the Alaska network. Emphasis will be placed on those stations where preferred mineral orientation is not likely to be responsible for the anisotropy. The derived stress directions will be compared to those estimated in previously funded NSF work based on inversion of fault-plane solutions. It is important to estimate stress directions from S-polarizations, where this can be done, because there is not enough information available concerning stress directions to understand the seismic hazard in central and southern Alaska. All stress direction estimates (from fault-plane solutions, volcanic dikes, hydrofracture and anisotropy) will be integrated to construct a seismotectonic model for central and southern Alaska. This research is a component of the National Earthquake Hazard Reduction Program. ***