Morfotectónica del segmento Cádiz-Málaga, sur de España.

Se presentan los resultados de una investigación morfotectónica del segmento continental de Cádiz a Málaga, zona occidental de interacción entre las placas africana y euroasiática. Aquí existe un sistema de 5 tipos de Unidades Territoriales (macrobloques= 2, mesobloques= 2, bloques= 29, microbloques= 44, y nanobloques= 202) en relaciones espacio-temporales actuales con una red de 29 alineaciones principales y 32 intersecciones o nudos. El 59% de los bloques es muy activo o activo, y el territorio tiene un valor de ~0.03 fracturas/km2 con 63 escarpes. Las zonas con mayor actividad están entre las localidades de Barbate-Torrecera-Sierra de las Cabras (en Cádiz) y Ronda-Embalse Gudaltela Cabras-Villalón (en Málaga). El segmento de Cádiz-Málaga tiene características similares a las de la zona colindante de Almería-Córdoba-Granada-Jaén-Murcia. Todo el trabajo sustentado en un SIG

Morphotectonic interpretation of the 23-02-2015 Albacete earthquake, Spain

On 02-23-2015, an earthquake took place in the Iberian Peninsula megablock. This event is of the intraplate- type (Mw= 4,7 / h= 17 km) where there is a deformed morphotectonic zone. The epicenter and the normal and strike-slip solution focal mechanism were determined in the Albacete block -which has an uplifting tendency inside of the Albacete and Cuenca mesoblocks

Uniqueness for SQG patch solutions

This paper is about the evolution of a temperature front governed by the surface quasi-geostrophic equation. The existence part of that program within the scale of Sobolev spaces was obtained by the third author (2008). Here we revisit that proof introducing some new tools and points of view which allow us to conclude the also needed uniqueness result.Ministerio de Economía y CompetitividadJunta de AndalucíaEuropean Research Counci

The Rayleigh-Taylor condition for the evolution of irrotational fluid interfaces

For the free boundary dynamics of the two-phase Hele-Shaw and Muskat problems, and also for the irrotational incompressible Euler equation, we prove existence locally in time when the Rayleigh-Taylor condition is initially satisfied for a 2D interface. The result for water waves was first obtained by Wu in a slightly different scenario (vanishing at infinity), but our approach is different because it emphasizes the active scalar character of the system and does not require the presence of gravity.Ministerio de Educación y CienciaEuropean Research Counci

Interface evolution: water waves in 2-D

We study the free boundary evolution between two irrotational, incompressible and inviscid fluids in 2-D without surface tension. We prove local-existence in Sobolev spaces when, initially, the difference of the gradients of the pressure in the normal direction has the proper sign, an assumption which is also known as the Rayleigh-Taylor condition. The well-posedness of the full water wave problem was first obtained by S. Wu. Well-posedness in Sobolev spaces of the full water wave problem in 2-D. Invent. math. 130, 39-72, 1997. The methods introduced in this paper allows us to consider multiple cases: with or without gravity, but also a closed boundary or a periodic boundary with the fluids placed above and below it. It is assumed that the initial interface does not touch itself, being a part of the evolution problem to check that such property prevails for a short time, as well as it does the Rayleigh-Taylor condition, depending conveniently upon the initial data. The addition of the pressure equality to the contour dynamic equations is obtained as a mathematical consequence, and not as a physical assumption, from the mere fact that we are dealing with weak solutions of Euler’s equation in the whole space.Ministerio de Educación y CienciaMinisterio de Ciencia e InnovaciónEuropean Research Counci

Porous media: the Muskat problem in 3D

The Muskat problem involves filtration of two incompressible fluids throughout a porous medium. In this paper we shall discuss in 3-D the relevance of the RayleighTaylor condition, and the topology of the initial interface, in order to prove its local existence in Sobolev spaces.Ministerio de Ciencia e InnovaciónEuropean Research CouncilNational Science Foundatio

Guantánamo, neo-estructura atípica del Caribe Norte

The work is a morphotectonic study of Guantánamo Province in Eastern Cuba. This territory is in the southern part of the North American plate. It differs mainly by seismic activity and the focal mechanisms of the adjacent segments of Santiago de Cuba, on the same plate, and the N of Haití, in the Caribbean plate. In this Cuban tectonic framework there is: a Geodynamic cell (C2) with clockwise movement, which includes 8 active blocks, 2 zones of coastal deformation arched and concave (Cc1= Baconao-Bahía de Guantánamo and Cc2= Maisí), 2 morphostructural articulation areas of 2nd order (IV and V), a S-N morphostructural escarpment (Punta Caleta-Punta del Fraile), and 3 seismic zones (Baracoa, Guantánamo and Maisí), but with lower level than in Santiago de Cuba and Haití. The main fault system is constituted by 4 active elements of 3 categories: 1) First: Oriente fault (E-W, the most important); 2) Second: Nortecubana fault; 3) Third A: Baconao fault; and 4) Third B: Purial fault. The 3 last elements have NW and NNW strikes. It has been determined, for the first time, a NNE tensor of efforts (T1-2) of transpressive type for the Baconao-Guantánamo segment. From the neotectonic point of view, the Guantánamo area is much less active than the adjacent territories of: 1) the Sierra Maestra and the Cauto basin, in Eastern Cuba; and 2) the N of Haití.Este trabajo es un estudio morfotectónico de la provincia de Guantánamo, en Cuba Oriental. Este territorio está en la parte meridional de la placa de Norteamérica y se diferencia, principalmente, por la actividad sísmica y el mecanismo de foco de los segmentos adyacentes de Santiago de Cuba, en la misma placa, y del Norte de Haití, en la placa del Caribe. En este marco tectónico cubano hay una celda geodinámica (C2) con movimiento horario, que incluye 8 bloques activos, 2 zonas de deformación costeras arqueadas y cóncavas (Cc1= Baconao-Bahía de Guantánamo y Cc2= Maisí), 2 zonas de articulación de morfoestructuras de 2º orden (IV y V), un escalón morfoestructural S-N (Punta Caleta-Punta del Fraile) y 3 zonas sísmicas (Baracoa, Guantánamo y Maisí), pero con menor nivel que en Santiago de Cuba y en Haití. El principal sistema de fallas lo constituyen 4 elementos activos de categoría: 1) Primero: falla Oriente (E-O, la más importante); 2) Segundo: falla Nortecubana; 3) Tercera A: falla Baconao; y 4) Tercera B: falla Purial. Las 3 últimas fallas tienen dirección NO y NNO. Se ha determinado, por primera vez, un tensor de esfuerzos (T1-2) NNE de tipo transpresivo para el segmento de Baconao-Guantánamo. Desde el punto de vista neotectónico, la zona es mucho menos activa que los territorios adyacentes de: 1) la Sierra Maestra y la Cuenca del Cauto, en Cuba Oriental; y 2) el N de Haití

Seismic crustal structure in the southwest of the Iberian Peninsula and the Gulf of Cadiz

The crust under the southwestern Iberian Peninsula and the Gulf of Cadiz has been sampled by 1200 km of deep seismic refraction=wide-angle reflection profiles, together with many seismic reflection lines and bore-holes. Wide-angle seismic data were collected during the last three decades. Commercial multichannel data provide a detailed image of the uppermost crust, improving the confidence about the models of the deeper structures. P-wave velocities within the thick column of sediments in the Gulf of Cadiz range from 2.0 to 3.8 km=s, while the Algarve and the Sines areas have higher velocities of 4.3 to 4.8 km=s. The top of the Palaeozoic basement rises to the northwest, outcropping in the South Portuguese zone of the Iberian Massif, and is characterized by P-wave velocities of 5.7–5.9 km=s. High velocities of 6.4 km=s have been found at shallow depths of 7 to 10 km in the South Portuguese zone, that could be related to the mafic and ultramafic rocks in the Beja-Acebuches zone. Lower crustal velocities are in the range of 6.7–6.9 km=s. The crustal thickness shows important lateral changes from 29 km beneath the Guadalquivir Basin=Iberian Massif contact to 35 km in the southeastern part of the South Portuguese zone. From the interpretation of these seismic data, a geodynamic model of the evolution of the crust in Southwestern Iberia and the Gulf of Cadiz is proposed. The Guadalquivir Basin, and its continuation at sea, the Gulf of Cadiz, is a flexure area of the crust that could be related to the overloading due to the overthrusting of the Alboran Domain over the Iberian plate

Seismotectonics Characterization of Mexico

Mexico is an active Seismotectonic Region in the most part of North American continental plate and has 2 types of seismicity interplate and intraplate There are in the hierarchical structure 3 Seismotectonic Provinces North Western Western and Eastern Centre Inside they exist 11 Seismotectonic Units where the Seismogenic Zones are defined The last mentioned are segmented Western Province has the highest level and where the contact of the converging plates take plac