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Adjoint-state FWI of streamer data in the upper plate of the Nicaragua subduction zone

AuthorsDagnino, D. ; Jiménez-Tejero, C.E. ; Sallarès, Valentí ; Ranero, César R.
Issue Date18-Jun-2018
Citation18 International SEISMIX Symposium : Book of abstracts: 89 (2018)
AbstractAdjoint-state FWI is in terms of resolution the most powerful existing tomographic method. It has become a well-established inversion method thanks to the efforts made by both industry and academy (Virieux and Operto, 2009). The main strength of the technique is that it allows obtaining unprecedented high resolution images of the subsurface of the Earth. In the last years we have developed our own FWI code called 2D3DA-FWI as a reference to the 2D and 3D acoustic FWI (Dagnino et al. 2014, Jimenez et al. 2015, Dagnino et al. 2016). Now, we applied this code to invert a 66 km-wide and 3 kmdeep Vp model. This shallow part displays the deep Sandino basin, filled by a sediment pile of variable thickness, which is folded and bent by the tectonic activity associated to the convergence between the subducting Cocos plate and the continent. Below the sediments, the basement is located at a variable depth between 200m and 2.5km depth. The details of its inner structure, the lithology of the geological domains, and the geometry and location of the main faults, which reflect the coupling between the subducting and overriding plates, are unknown. To better define all this details we have applied an adjoint-state FWI using the streamer data acquired in this region to obtain a higher resolution Vp model. To achieve this goal we have processed the multi-channel seismic data, applying data processing sequences designed by our group (Dagnino et al. 2017), and we have generated an initial model using a first arrival travel time tomography code based on a previously obtained one (Sallares et al., 2013)
Description18 International SEISMIX Symposium, Seismology between the Poles, 17-22 June 2018, Cracow, Poland.-- 1 page
Appears in Collections:(ICM) Comunicaciones congresos
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