Protocolo de acuerdo de colaboración entre el Ministerio de Medio Ambiente y el Consejo Insular de Aguas de Tenerife para el suministro de datos hidrometeorológicos

Acuerdo para armonizar las acciones que, dentro del ámbito de las respectivas competencias de cada Organismo, se refieren en particular al suministro al Consejo Insular de Aguas de Tenerife de los datos climatológicos obtenidos en la red observacional del Instituto Nacional de Meteorología existente en la Isla de Tenerife, así como la realización conjunta de estudios y proyectos de investigación en materias hidrometeorologicas de interés común

New Insight on the Increasing Seismicity during Tenerife's 2004 Volcanic Reactivation

Starting in April 2004, unusual seismic activity was observed in the interior of the island of Tenerife (Canary Islands, Spain) with much evidence pointing to a reawakening of volcanic activity. This seismicity is now analyzed with techniques unprecedented in previous studies of this crisis. The 200 earthquakes located onshore during 2004 and 2005 have been classified by cross-correlation, resulting in a small number of significant families. The application of a relative location algorithm (hypoDD) revealed important features about the spatial distribution of the earthquakes. The seismic catalogue has been enhanced with more than 800 additional events, detected only by the closest seismic station. These events were assigned to families by correlation and as a consequence their hypocentral location and magnitude were estimated by comparing them to the earthquakes of each family. The new catalogue obtained by these methods identifies two major seismogenic zones, one to the northwest and the other to the southwest of the Teide-Pico Viejo complex and having a separation of at least 10 km between them. These regions alternate their activity starting in January 2004, i.e., three months earlier than previously thought. We propose a simple model based on the results of this work which will also concur with all previous geophysical and geochemical studies of the 2004 crisis. The model proposes a single magma intrusion affecting the central part of the island with lateral dikes driven by the rifts to the northwest and southwest.Comment: 20 pages, 15 figure