@article {Kormann2011,
	title = {{Application of acoustic full waveform inversion to retrieve high-resolution temperature and salinity profiles from synthetic seismic data}},
	journal = {Journal of Geophysical Research},
	volume = {116},
	number = {C11},
	year = {2011},
	month = {nov},
	pages = {C11039},
	abstract = {Recent works show that multichannel seismic (MCS) systems are able to provide detailed information on the oceans{\textquoteright} fine structure. The aim of this paper is to analyze whether 1-D full waveform inversion algorithms are suitable to recover the extremely weak acoustic impedance contrasts associated to the oceans{\textquoteright} fine structure, as well as their potential to image meso-scale objects such as meddies. We limited our analysis to synthetic, noise-free data, in order to identify some methodological issues related to this approach under idealistic conditions (e.g., 1-D wave propagation, noise-free data, known source wavelet). We first discuss the influence of the starting model in the context of the multi-scale strategy that we have implemented. Then we show that it is possible to retrieve not only sound speed but also salinity and temperature contrasts within reasonable bounds from the seismic data using Neural Network relationships trained with regional oceanographic data sets. Potentially, the vertical resolution of the obtained models, which depends on the maximum frequency inverted, is of the order of 5-10 m, whereas the root mean square error of the inverted properties is shown to be \~{}0.5 m/s for sound speed, 0.1C for temperature, and 0.06 for salinity. To conclude this study, we have inverted synthetic data simulated along an oceanographic transect acquired during the EU-funded Geophysical Oceanography (GO) project. The results demonstrate the applicability of the method for synthetic data, as well as its potential to define oceanographic features along 2-D transects at full ocean depth with excellent lateral resolution. Copyright 2011 by the American Geophysical Union.},
	issn = {0148-0227},
	doi = {10.1029/2011JC007216},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-82355181440\&partnerID=tZOtx3y1},
	author = {Kormann, J. and Biescas, B. and Korta, N. and De La Puente, J. and Sallar{\`e}s, V.}
}
@conference {Melendez2010,
	title = {{Appraisal of joint refraction and reflection travel-time tomography in the context of weathering correction}},
	booktitle = {72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010},
	volume = {6},
	year = {2010},
	pages = {4692{\textendash}4696},
	abstract = {We propose an application of joint refraction and reflection travel-time tomography to determine both velocity and thickness of the weathering layer to be used in statics correction. This low velocity layer affects the quality of seismic images. The innovative aspect of our approach is the use of refracted and reflected phases. This remarkably reduces the trade-off between depth and velocity. First arrivals can be automatically picked and the reflection at the layer bottom can be easily identified because of the high impedance contrast with the basement. Synthetic data are generated for a reference model with an acquisition geometry simulating production experiments. The reference model is modified by adding a velocity perturbation and displacing the reflector to create the initial model for the inversion. Travel-time residuals decrease from \~{}1 s to \~{}0.1 s and the reflector is recovered to within {\textpm}2 m. A Monte Carlo analysis is performed to calculate the mean deviation and its reduction as a measure of the model parameters uncertainty. The improvement (10-50\%) is more significant in areas covered by reflections and refractions, while the reflector is again limited to a \~{}2 m range. We are testing this application with real data. {\textcopyright} 2010, European Association of Geoscientists and Engineers.},
	isbn = {9781617386671},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-78249271372\&partnerID=tZOtx3y1},
	author = {Mel{\'e}ndez, A. and De La Puente, J. and Sallar{\`e}s, V. and Ranero, C. R.}
}
@conference {DeLaPuente2010,
	title = {{The potential of discontinuous Galerkin methods for full waveform tomography}},
	booktitle = {72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010},
	volume = {6},
	year = {2010},
	pages = {4144{\textendash}4148},
	abstract = {We present a discontinuous Galerkin solver for Full Waveform Tomography applications in seismic exploration. We discuss the advantages and drawbacks of using unstructured meshes in the model discretization and present a numerical example. {\textcopyright} 2010, European Association of Geoscientists and Engineers.},
	isbn = {9781617386671},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-78249285605\&partnerID=tZOtx3y1},
	author = {De La Puente, J. and Sallar{\`e}s, V. and Ranero, C. R.}
}
@article {DelaPuente2009,
	title = {{Dynamic rupture modeling on unstructured meshes using a discontinuous Galerkin method}},
	journal = {Journal of Geophysical Research},
	volume = {114},
	number = {B10},
	year = {2009},
	month = {oct},
	pages = {B10302},
	publisher = {American Geophysical Union},
	abstract = {10 pages, 10 figures, 5 tables},
	issn = {0148-0227},
	doi = {10.1029/2008JB006271},
	url = {http://digital.csic.es/handle/10261/83876},
	author = {De La Puente, J. and Ampuero, J.-P. and Kaser, M.}
}
@article {Pham2009,
	title = {{Observations and Modeling of Rotational Signals in the P Coda: Constraints on Crustal Scattering}},
	journal = {Bulletin of the Seismological Society of America},
	volume = {99},
	number = {2B},
	year = {2009},
	month = {may},
	pages = {1315{\textendash}1332},
	abstract = {In addition to three classical components (vertical, north-south, and east-west) of ground translations recorded by a broadband seismometer, a component of earthquake induced rotational ground motions around the vertical axis is consistently measured by a ring laser sensor located in Wettzell, southeast Germany. Significant rotations around the vertical axis in the P coda of teleseismic signals are either directly visible or can be inferred through the investigation of cross correlation between the transverse component (the component that is perpendicular to the great circle connecting the earthquake and the seismometer) of translation acceleration and ring laser rotation rate. Theoretically, in spherically symmetric isotropic media, we should not observe rotational signals around the vertical axis before the onset of SH waves. Possible causes for the observed rotations in the P coda are: (1) tilt-ring laser coupling, (2) anisotropy, (3) topographic scattering, and (4) P-SH scattering in the crust. Here we show that P-SH scattering in the 3D random crust can explain the observations and allow us to constrain crustal scattering properties.},
	issn = {0037-1106},
	doi = {10.1785/0120080101},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-67649949683\&partnerID=tZOtx3y1},
	author = {Pham, N. D. and Igel, H. and Wassermann, J. and Kaser, M. and De La Puente, J. and Schreiber, U.}
}
@article {Stupazzini2009,
	title = {{Study of Rotational Ground Motion in the Near-Field Region}},
	journal = {Bulletin of the Seismological Society of America},
	volume = {99},
	number = {2B},
	year = {2009},
	month = {may},
	pages = {1271{\textendash}1286},
	abstract = {During the nineteenth and twentieth centuries observational seismologists recorded primarily the earthquake-induced translational wave field, while the rotational motion still remains poorly observed and investigated. We aim to further understand the rotational ground motion and its relation to the translational wave field, with a special emphasis on the near field, a few wavelengths away from the hypocenter, where damage related to rotational motion might need to be considered. A broad picture of the available values of rotational amplitudes and their variability is obtained by gathering most of the published data on strong rotational motion. To obtain a more detailed picture we perform a large scale 3D numerical study of a strike-slip event in the Grenoble valley where a combination of topographic, source, and site effects produces a realistic wave field. We analyzed the synthetic dataset in terms of the rotational and translational peak amplitudes and their dependence on two effects: nonlinear soil behavior and source directivity. On a soft soil deposit, we observe peak ground rotation of 1 mrad and the peak ground rotation rate of 10 mrad/sec, for an Mw 6.0 event. Those values show a strong dependence on the hypocenter location, the local site conditions, and the topographical features, inducing a variability of almost one order of magnitude in a range of distances of 20 km. Finally, we compare our numerical results in terms of peak ground velocity (PGV) versus peak ground rotation (PG${\o}mega$) with field data obtained at similar scenarios (e.g., Parkfield) by array techniques to investigate the relation between translational and rotational amplitudes expected in the near field for shallow, medium-sized earthquakes. Results of our numerical simulation fit reasonably well with those observed in past studies. Furthermore, the spatial variations of the PGV/PG${\o}mega$ ratio show a trend, which is correlated with the velocity structure of the model under study.},
	issn = {0037-1106},
	doi = {10.1785/0120080153},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-67649962349\&partnerID=tZOtx3y1},
	author = {Stupazzini, M. and De La Puente, J. and Smerzini, C. and Kaser, M. and Igel, H. and Castellani, A.}
}
