div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: Projected Hessian and quasi-Newton FWI src=https:reader036fdocumentsinreader036viewer20220628115681614e550346895dd0d418html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divpProjected Hessian and quasi-Newton FWIYong Map pSparse model space for projected Hessianp pQuasi-Newton FWIp pEigenvector largest eigenvaluep pEigenvector smallest eigenvaluepdiv