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吉林大学李静副教授报告通知
发布人:蔡易  发布时间:2018-07-23   浏览次数:1238

应数学系郭玉坤副教授的邀请,吉林大学地球探测科学与技术学院李静副教授将于近日来访我校并做学术报告,欢迎感兴趣的师生参加。

 

题目Wave-equation skeletonized surface waves inversion

时间2018727日下午,1600-17:00

地点:格物楼503报告厅

AbstractWe present the theory for wave-equation inversion of dispersion curves, where the misfit function is the sum of the squared differences between the wavenumbers along the predicted and observed dispersion curves. The dispersion curves are obtained from Rayleigh waves recorded by vertical-component geophones. Similar to wave-equation traveltime tomography, the complicated surface wave arrivals in traces are skeletonized as simpler data, namely the picked dispersion curves in the phase-velocity and frequency domains. Solutions to the elastic wave equation and an iterative optimization method are then used to invert these curves for 2-D or 3-D S-wave velocity models. This procedure, denoted as wave-equation dispersion inversion (WD), does not require the assumption of a layered model and is significantly less prone to the cycle-skipping problems of full waveform inversion. The synthetic and field data examples demonstrate that WD can approximately reconstruct the S-wave velocity distributions in laterally heterogeneous media if the dispersion curves can be identified and picked. The WD method is easily extended to anisotropic data and the inversion of dispersion curves associated with Love waves.

 

摘要:由 Li Gerard Schuster 2016年提出并实现的基于骨架反演(Skeletonized inversion)的地震面波速度反演成像方法,该方法无需一维层状介质假设,也可以很好的克服了面波全波形(FWI)反演存在的非线性问题,为面波频散反演二维、三维发展提供了新方法。一方面可以为解决深部油气资源勘探提供准确的浅部横波模型,提高深部结构成像反演精度;另一方面,高精度近地表结构主动源、被动源探测,在浅部工程与环境、城市地下空间安全利用等方面都有着重要的应用前景。

 

报告人简介:李静副教授,现为吉林大学地球探测科学与技术学院副教授。吉林大学地球物理学士,吉林大学地球探测与信息技术博士,沙特阿卜杜拉国王科技大学博士后(KAUST),主要从事应用地球物理新方法技术研究、科学计算、反问题、数值解等方面的研究。先后主持自然科学基金、中国博士后基金等科研项目,先后在《Geophysics》、《Geophysics Journal International》、《 Journal of Geophysics Research》等国际主流杂志上发表高水平研究论文30余篇,荣获2017年刘光鼎青年科技奖,入选吉林大学优秀青年重点培育计划。