Seismic Attenuation Structure of the Alaskan Subduction Zone

小行星9303945 本研究利用地震层析成像技术对阿拉斯加俯冲带及其上覆地幔楔的衰减结构进行成像。 将利用代数重建算法，对阿拉斯加俯冲带地震测得的并由阿拉斯加地震信息中心地震台阵记录的S/P振幅比进行反演，以获得三维衰减结构。 由此产生的图像将被用来检验有关俯冲洋壳和地幔岩石圈之间的接触带及其上方的变质和热过程的假设。 除了确定俯冲带的热结构和岩石学结构外，这项研究还将限制俯冲带剪切加热的重要性，并进一步加深我们对弧岩浆成因的理解。 ***

9303945 Sanders This research is to image the attenuation structure of the Alaska subduction zone and overlying mantle wedge by means of seismic tomography. S-to-P amplitude ratios measured from earthquakes located in the Alaska subduction zone and recorded by the Alaska Earthquake Information Center seismic array will be inverted for three-dimensional attenuation structure using an algebraic reconstruction algorithm. The resulting image will be used to test hypotheses concerning metamorphic and thermal processes at and above the contact zone between the subducted oceanic crust and the mantle lithosphere. In addition to determining the thermal and petrologic structure of the subduction zone, the study will constrain the importance of shear heating in subduction zones and further our understanding of arc magma genesis. ***