Estructura sísmica de la corteza bajo la cordillera del Rif
Tratamiento y reutilización de aguas residuales
The basic aim of the project is to characterize the crustal structure in the Northern part of Morocco, especially beneath the Rif Cordillera, based on the acquisition of new wide-angle seismic profiles and on the integration of the various seismic data sets now available. In this way we envisage to overcome one of the marked failures existing at present to constrain any evolutionary model of the complex interaction zone between the European and African plates: the lack of reliable results on the architecture of the crust in the southern flank. The proposal involves the recording of three profiles of wide-angle reflection/refraction seismics, through the internal and external units of the Rif Cordillera and their transition to most eastern domains and to the Atlas. In all these transects, whose length oscillate between 250 and 300 km, seismic stations will be installed with a density of one instrument per 750-1000 m, and 3 to 4 shots will be fired throughout each profile. The high amount and density of new data will allow building up models of internal distribution of seismic velocities that document the crustal structure and its lateral variations. This information can be regarded as a `missing link' among a series of recently acquired data sets in diverse projects.
In addition, this proposal has a clear added value: to benefit from synergies already established between research groups to maximise and improve the results from various studies. The RIFSIS design envisages also to integrate all the seismic information available coming from both present projects as SIMA (Active seismics in the Atlas), SIBERIA (passive seismics in South Spain-North Morocco) and TOPOIBERIA (multidisciplinary studies and networks covering the whole Peninsula), and previous projects (ESCI-Betics-Alboran, seismic refraction in Betics, etc.). For this purpose: a) the data analysis of the broadband seismic network deployed in the northern part of Morocco will be completed, and b) we plan to maintain this network operative during the first semester of 2010, beyond the conclusion of its impelling project, SIBERIA (October of 2009), to coexist with the deployment of an OBS network in Alboran during that period (project TOPO-MED). This will allow to profit from previous efforts and improve/complete the results of regional seismicity and seismotectonics, deep structure by studying conversion of P and S waves, mantle anisotropy and tomographic inversion from different types of waves and at different scales. In this later case, the constraint on the crustal structure from the seismic profiles will be of great importance, and will be integrated to approach the regional mantle tomography. The geodynamic implications of all new results will also be discussed.
Project Financed by PNIDI-CGL - CGL2009-09727
Josep Gallart, ICTJA-CSIC, Barcelona, Spain, Project Leader
Francisco Manuel Alonso Chaves, Universidad de Huelva, Spain
Lahcen Assebry, Institut Scientifique, Université Mohammed V Agdal-Rabat, Morocco
Luciana Bonatto, ICTJA-CSIC, Barcelona, Spain
Jordi Diaz, ICTJA-CSIC, Barcelona, Spain
Bouchta El Fellah, Institut Scientifique, Université Mohammed V Agdal-Rabat, Morocco
Driss El Ouai Institut Scientifique, Université Mohammed V Agdal-Rabat, Morocco
Mimoun Harnafi, Institut Scientifique, Université Mohammed V Agdal-Rabat, Morocco
Omar Kettani, Institut Scientifique, Université Mohammed V Agdal-Rabat, Morocco
Miguel Orozco Fernández, Universidad de Granada, Spain
Martin Schimmel, ICTJA-CSIC, Barcelona, Spain
Mohammed Jamal E. Sebbani, Institut Scientifique, Université Mohammed V Agdal-Rabat, Morocco
Abdelfatah Tahiri, Institut Scientifique, Université Mohammed V Agdal-Rabat, Morocco
Antonio Villaseñor, ICTJA-CSIC, Barcelona, Spain
Alba Gil de la Iglesia, ICTJA-CSIC, Barcelona, Spain
Figure 1. Scheme of shots and profiles recorded. Five dynamite shots, 1T each, were recorded by 900 stations deployed along two profiles N-S and E-W oriented. Additional recordings were obtained from a coeval marine seismic experiment on the Alboran Sea.
Figure 2. left) Drilling and explosive charging in one of the shotpoints. right) One of the holes, once the shot has been fired
Figure 3. Data set examples : The record-sections of the three shots along profile E-W.
Procesos de colisión Arco-Continente en Taiwan
Tratamiento y reutilización de aguas residuales
The project PROTAI will integrate new surface geological observations with passive-source (earthquake) seismic data to study the crustal structure, physical properties (Vp, Vs, density) and the tectonic processes in the active arc-continent collision that is taking place between the Luzon arc and the continental margin of Eurasia in Taiwan. Research on the Taiwan orogen will be integrated with the results of previous research of the group into arc-continent collision in fossil orogens, as well as with its research into petrophysical properties of the curst and upper mantle. The research is focused into three main themes:
• Crustal structure. Determine the crustal structure on the Taiwan orogen from the active frontal thrusts of the Western Foothills to the accreting forearc in the Coastal Range in the east. Detailed structural mapping combined with geophysical data, in particular seismicity, will provide information on the response of the extended continental margin as it enters the subduction zone.
• Tomography and petrophysical modeling of the Taiwan crust using Vp and Vs velocities, and potential field data. This provides important information about the composition of the crust and its physical properties. These properties are important in determining the fate of the continental crust as it is subducted.
• Determining geodynamic processes. The end result of this research is to develop a model for the geodynamic processes that take place during arc-continent collision. The processes include, but are not restricted to; crustal recycling through the subduction factory and how this influences the growth of new continental crust, determining the timing and extent of vertical and horizontal movements along faults in the thrust belt and the subsequent evolution of topography.
Project Financed by PNIDI-CGL - CGL2009-11843
Dennis Brown, ICTJA-CSIC, Barcelona, Spain
Joaquina Alvarez-Marron, ICTJA-CSIC, Barcelona, Spain
Giovanni Camanni, ICTJA-CSIC, Barcelona, Spain
Ramon Carbonell, ICTJA-CSIC, Barcelona, Spain
David Marti, ICTJA-CSIC, Barcelona, Spain
Conxi Ayala, IGME, Madrid, Spain
Sergio Llana Funez, Department of Geology, University of Oviedo, Oviedo, Spain
Chi-Yue Huang, Department of Geosciences, National Cheng-Kung University, Tainan, Taiwan
Yih-Min Wu, Department of Geosciences, National Taiwan University, Taipei, Taiwan
Figure 1. Alishan Mountains, Taiwan.
Figure 2. Folding along the Tili thrust
Figure 3. Ductile deformation along the Lishan fault.
C/ Lluis Solé Sabaris s/n, Barcelona, E-08028 Spain
Institut de Ciències de la Terra Jaume Almera
+34 93 409 54 10