报告地点:教学行政楼706
报告时间:2023-03-24 从 15:00 到 16:30
报告人:王凯(中国科学技术大学)
报告人简介:
王凯,中国科学技术大学地球和空间科学学院特任教授。2012年本科毕业于中国地质大学(武汉)地球物理实验班,2019年博士毕业于澳大利亚麦考瑞大学地球与行星科学系,先后在加拿大多伦多大学,麦考瑞大学和新加坡南洋理工大学开展博士后研究工作。主要从事地震全波形反演方法研发以及其在地壳地幔结构成像中的应用,研究方向包括:基于波动方程和伴随法的地震全波形反演方法与程序研发,多分量背景噪声全波形反演,基于混合数值模拟方法的远震全波形反演,密集台阵与噪声成像,地震各向异性研究岩石圈形变,火山区地震层析成像,多数据联合反演。目前已在GRL,JGR: Solid Earth,EPSL,GJI等发表论文14篇,其中第一或通讯作者9篇,担任GRL,JGR: Solid Earth,SRL,GJI等多个国际学术期刊审稿人
报告题目:The adjoint-state method and its application to seismic anisotropic tomography in volcanic regions
报告内容简介
The adjoint-state method was introduced in the theory of inverse problems to efficiently compute the gradient of a functional without constructing Fréchet derivatives. This method now has been combined with numerical techniques to solve large-scale non-linear optimization problems based on physical equations. In this talk, I will first briefly introduce the use of the adjoint-state method in Eikonal equation based traveltime tomography and wave equation based adjoint tomography. Then, I will present two applications of the adjoint-state method to seismic anisotropic tomography in volcanic regions, including (1) P-wave azimuthal anisotropy in the Sierra Nevada and Walker Lane (Long Valley Caldera) based on adjoint-state traveltime tomography and (2) Shear-wave radial anisotropy beneath the Toba Caldera from ambient noise adjoint tomography.