Topo-Iberia Project: CGPS crustal velocity field in the Iberian Peninsula and Morocco

A new continuous GPS network was installed under the umbrella of a research project called 'Geociencias en Iberia: Estudios integrados de topografı´a y evolución 4D (Topo-Iberia)', to improve understanding of kinematic behavior of the Iberian Peninsula region. Here we present a velocity field based on the analysis of the 4 years of data from 25 stations constituting the network, which were analyzed by three different analysis groups contributing to the project. Different geodetic software packages (GIPSY-OASIS, Bernese and GAMIT) as well as different approaches were used to estimate rates of present day crustal deformation in the Iberian Peninsula and Morocco. In order to ensure the consistency of the velocity fields determined by the three groups, the velocities obtained by each analysis center were transformed into a common Eurasia Reference Frame. After that, the strain rate field was calculated. The results put in evidence more prominent residual motions in Morocco and southernmost part of the Iberian Peninsula. In particular, the dilatation and shear strain rates reach their maximum values in the Central Betics and northern Alboran Sea. A small region of high shear strain rate is observed in the east-central part of the peninsula and another deformation focus is located around the Strait of Gibraltar and the Gulf of Cadiz

Continuous GPS stations deployment in the Topo-Iberia Project framework

Topo-Iberia es un proyecto financiado por el Ministerio de Educación y Ciencia de España. Su principal objetivo es comprender las interacciones entre los procesos profundos, superficiales y atmosféricos integrando datos geológicos, geofísicos y geodéticos. El proyecto se centrará en tres zonas principales de interés en la Península Ibérica: los bordes N y S de la Placa Ibérica (incluyendo el N de Marruecos) y su núcleo central intermedio. Presentamos las actividades preliminares realizadas por el subgrupo GPS de Topo-Iberia con el fin de desplegar una nueva red continua de GPS. La intención es complementar las redes CGPS continuas existentes (p.e. ROA; ERGPS) incrementado la cobertura espacial en España y N de Marruecos. Una vez seleccionados los emplazamientos de las nuevas estaciones, el objetivo es que se encuentren en pleno funcionamiento la primavera de 2008. Se han descargado conjuntos de datos CGPS de servidores de distintas instituciones sobre los que se ha realizado un procesado inicial que sirva como control de calidad. Como algunas de las estaciones actualmente disponibles no siguen los estrictos procedimientos de estabilidad dictados por IGS/EUREF, estamos evaluando sus resultados mediante análisis de series temporales para decidir cuales se pueden incluir como estaciones complementarias de la red Topo-Iberia.Topo-Iberia is a Spanish Research Council funded project. Its main objective is to understand the interactions between deep, shallow and atmospheric processes, integrating geological, geophysical, geodetic and geo-technological research activities. The project will focus in three main areas of interest in the Iberian Peninsula: Northern and Southern borders of the Iberian micro-plate (taking into account the Northern part of Morocco), and its central core. We present the preliminary steps that the Topo- Iberia GPS working group is undergoing in order to deploy a new Continuous GPS Network. We are trying to complement the existing and functioning CGPS Networks (e.g. ROA; ERGPS) by increasing the spatial coverage across Spain and Northern Morocco. The places for the new locations have been chosen and all stations should be working in the spring 2008. A set of available CGPS data files has been downloaded from different institutional servers. A preliminary data analysis has been performed for geodetic quality control. Since some of the existing CGPS stations have been installed without following strict IGS/EUREF procedures for the stability of the monuments, we are evaluating their performance through the time series analysis, in order to decide whether to include them as complementing stations to our network.Depto. de Geodinámica, Estratigrafía y PaleontologíaFac. de Ciencias GeológicasTRUEMinisterio de Ciencia e Innovación (MICINN)CONSOLIDER TOPO-Iberiapu

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