4-D imaging of subsurface changes with coda waves: numerical studies of 3-D combined sensitivity kernels and applications to the Mw7.9, 2008 Wenchuan earthquake

Anne Obermann 1 Thomas Planes 2 Eric Larose 3 Michel Campillo 3
1 ETH Zürich - Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology in Zürich [Zürich]
2 UNIGE - Université de Genève
3 ISTerre - Institut des Sciences de la Terre
Abstract : In the context of seismic monitoring, recent studies made successful use of seismic coda waves to image the lateral extent of medium changes. Locating the depth of the changes, however, remains a challenge. We use multiply-scattered body-and surface wave 3-D combined sensitivity kernels to address this problem. We show that we can locate velocity perturbations at depth with numerical data from elastic wave-field simulations in 3-D heterogeneous media. This procedure is then applied to assess the extent of the crustal damage due to the M w 7.9, 2008 Wenchuan earthquake. We discuss the potential and limitations of our approach to retrieve the depth information of temporal changes occurring in heterogeneous structures.
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Anne Obermann, Thomas Planes, Eric Larose, Michel Campillo. 4-D imaging of subsurface changes with coda waves: numerical studies of 3-D combined sensitivity kernels and applications to the Mw7.9, 2008 Wenchuan earthquake. Pure and Applied Geophysics, Springer Verlag, 2019, 176 (3), pp.1243-1254. ⟨10.1007/s00024-018-2014-7⟩. ⟨hal-02264394⟩

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