@booklet {GarciaX.MonteysX.EvansR.LandSzpak2014,
	title = {{Near seabed geology using a multidisciplinary geophysical approach in a shallow gas environment in the Malin Sea (NW Ireland)}},
	year = {2014},
	keywords = {accepted, Geochemistry, Geophysics, Geosystems},
	author = {Garcia, X. and Monteys, X. and Evans, R.L and Szpak, M.T.}
}
@article {Neukirch2014,
	title = {{Nonstationary magnetotelluric data processing with instantaneous parameter}},
	journal = {Journal of Geophysical Research: Solid Earth},
	volume = {119},
	number = {3},
	year = {2014},
	pages = {1634{\textendash}1654},
	issn = {21699313},
	doi = {10.1002/2013JB010494},
	url = {http://doi.wiley.com/10.1002/2013JB010494},
	author = {Neukirch, M. and Garcia, X.}
}
@article {NEUKIRCH2013,
	title = {{NONSTATIONARY TIME SERIES CONVOLUTION: ON THE RELATION BETWEEN THE HILBERT{\textendash}HUANG AND FOURIER TRANSFORM}},
	journal = {Advances in Adaptive Data Analysis},
	volume = {05},
	number = {01},
	year = {2013},
	month = {jan},
	pages = {1350004},
	publisher = {World Scientific Publishing Company},
	abstract = {The Hilbert{\textendash}Huang Transform (HHT) decomposes time series into intrinsic mode functions (IMF) in time-frequency domain. We show that time slices of IMFs equal time slices of Fourier series, where the instantaneous parameters of the IMF define the parameters amplitude and phase of the Fourier series. This leads to the formulation of the theorem that nonstationary convolution of an IMF with a general time domain response function translates into a multiplication of the IMF with the respective spectral domain response function which is explicitly permitted to vary over time. We conclude and show on a real world application that a de-trended signal{\textquoteright}s IMFs can be convolved independently and then be used for further time-frequency analysis. Finally, a discussion is opened on parallels in HHT and the Fourier transform with respect to the time-frequency domain.},
	keywords = {convolution, Fourier transform, Hilbert{\textendash}Huang transform, nonstationary, Time series},
	issn = {1793-5369},
	doi = {10.1142/S1793536913500040},
	url = {http://www.worldscientific.com/doi/abs/10.1142/S1793536913500040},
	author = {NEUKIRCH, MAIK and Garcia, Xavier}
}
@conference {Nagel2012b,
	title = {{A numerical evaluation of the geomechanical interactions between a hydraulic fracture stimulation and a natural fracture system}},
	booktitle = {46th US Rock Mechanics / Geomechanics Symposium 2012},
	volume = {3},
	year = {2012},
	pages = {1882{\textendash}1898},
	abstract = {Due to the low permeability of many shale gas reservoirs, multi-stage hydraulic fracturing in horizontal wells is used to increase the stimulated volume. However, each created hydraulic fracture alters the stress field around it, and subsequent fractures are affected by the stress field from the previous fractures, which results in higher net pressures, smaller fracture widths, and diminished microseismic emissions. The results of a numerical evaluation of the effect of stress shadowing, as a function of natural fracture and geomechanical properties, are presented, including a detailed evaluation of natural fracture shear failure (and, by analogy, the microseismicity) due to a created hydraulic fracture using both continuum and discrete element modeling approaches. The results show the critical impact that a created hydraulic fracture has on the shear of the natural fracture system, which in-turn, significantly affects the success of the stimulation. Furthermore, the results provide important insight into the mechanisms that generate the microseismicity that occurs during a hydraulic fracture stimulation. Copyright 2012 ARMA, American Rock Mechanics Association.},
	isbn = {9781622765140},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84873277033\&partnerID=tZOtx3y1},
	author = {Nagel, N. B. and Sanchez-Nagel, M. A. and Garcia, X. and Lee, B.}
}
@article {Urgeles2011a,
	title = {{New constraints on the Messinian sealevel drawdown from 3D seismic data of the Ebro Margin, western Mediterranean}},
	journal = {Basin Research},
	volume = {23},
	number = {2},
	year = {2011},
	month = {apr},
	pages = {123{\textendash}145},
	abstract = {We present new 3D seismic and well data from the Ebro Margin, NW Mediterranean Sea, to shed new light on the processes that formed the Messinian Erosion Surfaces (MES) of the Valencia Trough (Mediterranean Sea). We combine these data with backstripping techniques to provide a minimum estimate of the Messinian sea level fall in the EBRO Margin, as well as coupled isostasy and river incision and transport modeling to offer new constraints on the evolution of the adjacent subaerial Ebro Basin. Four major seismic units are identified on the Cenozoic Ebro Margin, based on the seismic data, including two major prograding megasequences that are separated by a major unconfirmity: the MES. The 3D seismic data provide an unprecedented view of the MES and display characteristic features of subaerial incision, including a drainage network with tributaries of at least five different orders, terraces and meandering rivers. The Messinian landscape presents a characteristic stepped-like profile that allows the margin to be subdivided in three different regions roughly parallel to the coastline. No major tectonic control exists on the boundaries between these regions. The boundary between the two most distal regions marks the location of a relatively stable base level, and this is used in backstripping analysis to estimate the magnitude of sea level drop associated with the Messinian Salinity Crisis on the Ebro Margin. The MES on the Ebro Margin is dominated by a major fluvial system, that we identify here as the Messinian Ebro River. The 3D seismic data, onshore geology and modeling results indicate that the Ebro River drained the Ebro Basin well in advance of the Messinian. {\textcopyright} 2010 The Authors. Basin Research {\textcopyright} 2010 Blackwell Publishing Ltd, European Association of Geoscientists \& Engineers and International Association of Sedimentologists.},
	issn = {0950091X},
	doi = {10.1111/j.1365-2117.2010.00477.x},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79952079451\&partnerID=tZOtx3y1},
	author = {Urgeles, Roger and Camerlenghi, Angelo and Garcia-Castellanos, Daniel and De Mol, Ben and Garc{\'e}s, Miquel and Verg{\'e}s, Jaume and Haslam, Ian and Hardman, Martin}
}
@article {Manchuel2011,
	title = {{New insights on the interseismic active deformation along the North Ecuadorian-South Colombian (NESC) margin}},
	journal = {Tectonics},
	volume = {30},
	number = {4},
	year = {2011},
	month = {aug},
	pages = {n/a{\textendash}n/a},
	abstract = {The North Ecuadorian-South Colombian subduction zone was the site of the 1906 Mw 8.8 megathrust earthquake. This main shock was followed by three large events in 1942, 1958, and 1979 whose rupture zones were located within the 500 km long 1906 rupture area. A combined onshore and offshore temporary seismic network covering from the trench to the Andes was deployed during 3 months in the area of large earthquakes, in order to obtain a detailed knowledge of the seismic background activity. Resulting earthquakes location and mechanisms bring new insights on interseismic active deformation distribution in the three main tectonic units of the margin, namely, the Interplate Seismogenic Zone, the fore-arc region which is part of the North Andean Block and the downgoing oceanic Nazca plate. The interplate seismic activity presents along strike variations, suggesting that the seismicity and the associated stress buildup along the plate interface depend on the time elapsed since the last large earthquakes. According to our results, the updip and downdip limits of the seismogenic zone appear to be located at 12 and 30 km depth, respectively. Shallow to intermediate depth seismicity indicates a slab dip angle of ≈25{\textdegree}. North of the Carnegie Ridge, the Wadati-Benioff plane is defined beneath the fore arc down to ≈100 km depth. Facing the ridge, the Wadati-Benioff plane extends beneath the Andes, down to ≈140 km depth. This observation conflicts with the hypothesis of the presence of a flat slab at a depth of 100 km facing the ridge. In the overlying fore-arc region, the crustal seismicity occurs down to 40 km depth and is mainly concentrated in a roughly NW-SE 100 km wide stripe stretching from the coast, at about 1{\textdegree}N, to the Andes. The location of this active deformation stripe coincides with observed tectonic segmentation of the coastal domain as evidenced by the presence of an uplifting segment to the south and a subsiding segment to the north of the stripe. It also corresponds to a ≈30{\textdegree} change in the trend of the Andes, suggesting that the curvature of the volcanic arc might play an important role in the deformation of the fore-arc region. Copyright 2011 by the American Geophysical Union.},
	issn = {02787407},
	doi = {10.1029/2010TC002757},
	url = {http://doi.wiley.com/10.1029/2010TC002757 http://www.scopus.com/inward/record.url?eid=2-s2.0-79960929640\&partnerID=tZOtx3y1},
	author = {Manchuel, Kevin and R{\'e}gnier, Marc and B{\'e}thoux, Nicole and Font, Yvonne and Sallares, Valenti and D{\'\i}az, Jordi and Yepes, Hugo}
}
@article {Palomeras2009,
	title = {{Nature of the lithosphere across the Variscan orogen of SW Iberia: Dense wide-angle seismic reflection data}},
	journal = {Journal of Geophysical Research},
	volume = {114},
	number = {B2},
	year = {2009},
	month = {feb},
	pages = {B02302},
	abstract = {Two wide-angle seismic transects have been acquired across the SW Iberian Massif. They crossed three major geological zones (South Portuguese Zone, Ossa-Morena Zone, and Central Iberian Zone), with their tectonic contacts and the Pyrite Belt being of greatest interest. A total of 690 digital seismic recording instruments (650 Texans and 40 Reftek 3 component units) from the IRIS-PASSCAL Instrument Pool were used. The transects (A and B) are each approximately 300 km long and consist of 3 and 6 shot points, respectively, with an approximately 60-km shot point interval. The charge sizes range from 1000 kg at the edges to 500 kg at the center. These recently acquired experiments were designed to provide velocity constraints on the lithosphere and to complement the previously acquired normal incidence seismic profile IBERSEIS. Both data sets are part of the SW Iberia project, which was developed within the EUROPROBE program and designed to address fundamental questions about the nature and dynamics of the Variscan lithosphere. The acquisition parameters provide closely spaced wide-angle seismic images of the lithosphere beneath SW Iberia. In transect A, the station spacing was on average 400 m, while along transect B, the receiver spacing was approximately 150 m. Because of this close trace spacing, the lateral continuity of the seismic arrivals is greatly improved. Frequency analysis revealed that the recorded events feature relatively low frequencies (6-25 Hz). After processing, the shot records show high-amplitude and well-defined arrivals. The interpreted PmP arrival, located at approximately 11 s (normal incidence traveltime), is characterized by high amplitude and relatively low frequency (6-12 Hz). A well-defined Pn arrival appears at offsets beyond 120 km. At far offsets greater than 180 km, an upper mantle reflection is observed. Furthermore, within the upper crust, the shots records feature a relatively high-velocity arrival, located at 4-5-s normal incidence traveltime. The analysis of this arrival indicates that it probably corresponds to the top of the Iberian Reflective Body identified in the IBERSEIS deep seismic profile. The velocity models obtained by forward modeling show a complex crust, especially in the middle crust. The velocity models are the most detailed ones that have been produced in the area and contain a large amount of new features that are relevant to the understanding of the composition of the crust and upper mantle beneath the zone. The velocity depth functions derived from the velocity models have higher middle crustal velocities than the average in other continental areas. A comparison between laboratory seismic velocity measurements and the velocities of the models was carried out in order to estimate the crustal and the upper mantle composition. Results indicate that the high middle crust velocities correspond to rocks of a mafic composition. The combined data set reveals new aspects related to the lithospheric evolution of this transpressive orogen and allows us to attempt an interpretative cross section of the upper lithosphere in SW Iberia. {\textcopyright} 2009.},
	issn = {0148-0227},
	doi = {10.1029/2007JB005050},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-66149180585\&partnerID=tZOtx3y1},
	author = {Palomeras, I. and Carbonell, R. and Flecha, I. and Simancas, F. and Ayarza, P. and Matas, J. and Mart{\'\i}nez Poyatos, D. and Azor, A. and Gonz{\'a}lez Lodeiro, F. and P{\'e}rez-Esta{\'u}n, A.}
}
@article {VonHuene2009,
	title = {{Neogene collision and deformation of convergent margins along the backbone of the Americas}},
	journal = {Geological Society of America Memoirs},
	volume = {204},
	year = {2009},
	month = {jun},
	pages = {67{\textendash}83},
	abstract = {Along Pacific convergent margins of the Americas, high-standing relief on the subducting oceanic plate "collides" with continental slopes and subducts. Features common to many collisions are uplift of the continental margin, accelerated seafloor erosion, accelerated basal subduction erosion, a flat slab, and a lack of active volcanism. Each collision along America{\textquoteright}s margins has exceptions to a single explanation. Subduction of an \~{}600 km segment of the Yakutat terrane is associated with >5000-m-high coastal mountains. The terrane may currently be adding its unsubducted mass to the continent by a seaward jump of the deformation front and could be a model for docking of terranes in the past. Cocos Ridge subduction is associated with >3000-m-high mountains, but its shallow subduction zone is not followed by a flat slab. The entry point of the Nazca and Juan Fernandez Ridges into the subduction zone has migrated southward along the South American margin and the adjacent coast without unusually high mountains. The Nazca Ridge and Juan Fernandez Ridges are not actively spreading but the Chile Rise collision is a triple junction. These collisions form barriers to trench sediment transport and separate accreting from eroding segments of the frontal prism. They also occur at the separation of a flat slab from a steeply dipping one. At a smaller scale, the subduction of seamounts and lesser ridges causes temporary surface uplift as long as they remain attached to the subducting plate. Off Costa Rica, these features remain attached beneath the continental shelf. They illustrate, at a small scale, the processes of collision. {\textcopyright} 2009 The Geological Society of America. All rights reserved.},
	issn = {0072-1069},
	doi = {10.1130/2009.1204(03)},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-77949859751\&partnerID=tZOtx3y1},
	author = {von Huene, R and Ranero, C.R}
}
@article {Garcia2009,
	title = {{Numerical study of the effects of particle shape and polydispersity on permeability}},
	journal = {Physical Review E},
	volume = {80},
	number = {2},
	year = {2009},
	month = {aug},
	pages = {021304},
	abstract = {We study through numerical simulations the dependence of the hydraulic permeability of granular materials on the particle shape and the grain size distribution. Several models of sand are constructed by simulating the settling under gravity of the grains; the friction coefficient is varied to construct packs of different porosity. The size distribution and shapes of the grains mimic real sands. Fluid flow is simulated in the resulting packs using a finite element method and the permeability of the packs is successfully compared with available experimental data. Packs of nonspherical particles are less permeable than sphere packs of the same porosity. Our results indicate that the details of grain shape and size distribution have only a small effect on the permeabilty of the systems studied. {\textcopyright} 2009 The American Physical Society.},
	issn = {1539-3755},
	doi = {10.1103/PhysRevE.80.021304},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-70349241904\&partnerID=tZOtx3y1},
	author = {Garcia, Xavier and Akanji, Lateef and Blunt, Martin and Matthai, Stephan and Latham, John}
}
@article {Rodriguez2008,
	title = {{A new multi-platform modular software tool for wide-angle reflection/refraction seismic data processing and representation (WASPAR)}},
	journal = {Computers \& Geosciences},
	volume = {34},
	number = {5},
	year = {2008},
	pages = {456{\textendash}463},
	abstract = {WASPAR (Wide-Angle reflection-refraction Seismic data Processing And Representation) is a new free multi-platform software tool to process and display wide-angle seismic data. It has been designed to read different raw data formats, construct record sections, process them using existing and newly developed algorithms, pick seismic phases and generate graphic files using a single, user-friendly interface. The main characteristics of WASPAR are its flexibility and expandability. It has been designed in a modular way using a plug-in architecture to manage raw data access and processing functionalities. We thus obtain a stable base easily maintainable and expandable. We have chosen the C ++ programming language in combination with an object oriented methodology to facilitate the development of a multi-platform software tool, which is already available on Linux and MS Windows. In order to allow its expansion and upgrade, the program will be freely distributed under the terms of GPL license. The philosophy of this software tool is to leave it open to external contributions. {\textcopyright} 2007 Elsevier Ltd. All rights reserved.},
	keywords = {Object oriented programming, Plug-in, Signal processing, Software, wide-angle seismics},
	issn = {00983004},
	doi = {10.1016/j.cageo.2007.04.011},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-39149086998\&partnerID=tZOtx3y1},
	author = {Rodr{\'\i}guez, I. and Simon, C. and Sallar{\`e}s, V. and Carlosena, A. and M{\`a}nuel, A. and Da{\~n}obeitia, J.J.}
}
@article {CALAHORRANOB2008,
	title = {{Nonlinear variations of the physical properties along the southern Ecuador subduction channel: Results from depth-migrated seismic data}},
	journal = {Earth and Planetary Science Letters},
	volume = {267},
	number = {3-4},
	year = {2008},
	pages = {453{\textendash}467},
	abstract = {We use two high-quality pre-stack depth-migrated multichannel seismic profiles acquired to quantify physical properties variations of underthrust sediments along the first \~{} 30~km of subduction off the erosional southern Ecuadorian margin. Seismic data show three zones along the subduction channel (referred to as Zones I, II and III) characterized by distinct velocity and velocity-derived physical properties, which are in agreement with values estimated from experimental results of deformation in granular media. These three zones result from transformational changes of underthrust sediments governed by fundamentally different physical processes that control their mechanical behavior at increasing confining pressures. Based on our observations and its comparison with experimental results, we argue that the transformations undergone by underthrust sediments as they dip into the subduction zone are the following: within Zone I, progressively increasing velocity (and decreasing velocity-derived porosity) indicates continuous sediment compaction, which must be accompanied by effective fluid drainage along the d{\'e}collement and/or across the accretionary wedge. The underthrust material is here unconsolidated from a mechanical point of view. Laboratory experiments indicate that the dominant processes at this range of pressures are grain rolling, particle rotation and frictional slip at grain contacts. Within Zone II, velocity (and porosity) remains constant for \~{} 16~km (SIS-72) and \~{} 12~km (SIS-18). This suggests undrained conditions resulting in growing fluid overpressure at the subduction channel. Grain deformation is similar to Zone I. Within Zone III, velocity increases and porosity falls rapidly, indicating sediment compaction and subsequent release of over-pressured fluids, where grain deformation is likely to be elastic. This might be the dominant process until the grains attain their crushing strength, resulting in granular cataclasis and, eventually, in the collapse of the system. We suggest that over-pressured fluid release may induce hydrofracturation and it is likely to increase inter-plate coupling down from Zone III. {\textcopyright} 2007 Elsevier B.V. All rights reserved.},
	keywords = {fluid overpressure, grain deformation, subduction channel, velocity inversion},
	issn = {0012821X},
	doi = {10.1016/j.epsl.2007.11.061},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-39649120786\&partnerID=tZOtx3y1},
	author = {CALAHORRANOB, A and SALLARES, V and COLLOT, J and SAGE, F and RANERO, C}
}
@booklet {McIntosh2007,
	title = {{The Nicaragua Convergent Margin: Seismic Reflection Imaging of the Source of a Tsunami Earthquake}},
	journal = {The seismogenic zone of subduction thrust faults},
	year = {2007},
	pages = {257{\textendash}287},
	publisher = {University of British Columbia Press},
	abstract = {Peer Reviewed},
	isbn = {isbn: 978-0-231-13866-6},
	url = {http://digital.csic.es/handle/10261/108405},
	author = {McIntosh, Kirk D and Silver, Eli a and Ahmed, Imtiaz and Berhorst, Arnim and Ranero, C{\'e}sar R and Kelly, Robyn K and Flueh, Ernst R}
}
