By E. Buforn, J. Martín-dávila, A Udías (auth.), E. Buforn, J. Martín-Dávila, A. Udías (eds.)
The following 4 papers take care of the seismicity and seismotectonic of the area. Carrilho et al. current the 1st result of GEOALGAR, a undertaking initiated in 2000 to observe the seismic job within the Algarve zone (southern Portugal). during this paper result of the relocation of epicenters and resolution of fault aircraft recommendations are offered. the recent epicentral destinations express a extra equipped spatial distribution which may point out a potential correlation with a few recognized tectonic beneficial properties. Fault airplane options are predominantly of strike-slip movement in line with a horizontal compression within the NW-SE to NNW-SSE course. The paper through Yelles-Chaouche et al. offers an in depth examine of the 22 December, 1999 earthquake at Ain Temouchent (northwest Algeria) of value five. 7. The earthquake prompted severe harm within the city of Ain Teemouchent with 25 casualties and 25000 humans left homeless. depth map, floor positive aspects and the focal mechanism, in line with wave shape research, are proven. The mechanism corresponds to opposite fault movement with planes impressive NNE-SSW because of horizontal compression within the NW-SE path. This corresponds to the final mechanism came across for Algeria earthquakes. Buforn et al. current a learn of the features of the plate boundary among Africa and Iberia, from west of Cape San Vicente to Algeria, utilizing seismicity and resource mechanism info. The area is split into 3 components which occur various characteristics.
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6B) is also dated at c. 25-20 Ma. , 2000). During the Middle Miocene, the Numidian units at the crest of the accretionary prism are submitted to erosion (DmoN and FEINBERG, 1979), and allowed to detach and slide inward on the Alboran basin slope (Jbc1 Zemzem klippe, Fig. 2). , 1973; DURAND-DELGA, 1980). The late Mioccne-Pliocene events poorly change the Rif-Betic structure. During the early-middle Tortonian, contraction goes on in the Rif orogenic prism, and causes the External Rif nappe stacking and folding (locally associated with very-Iowgrade metamorphism of the Early-Middle Miocene sediments at c.
PlANA, F. and POLINO, R. (1995), Tertiary Structural Relationships Between Alps and Apennines: The Critical Torino Hill and Mont/errato Area, Northwestern Ita(y, Terra Nova 7, 138-143. , and BAHI, L. (1987), Permanence of Structural Lines in Morocco since Precambrian to Present, African J. Earth Sci. 6, 247-256. , and LAVILLE, E. 'on maghrebin: contraimes structurales et geochimiques, e. R. Acad. Sci. 326, 575581. P. M. (1989), Extensional Collapse of Thickened Continental Lithosphere: A Working Hypothesis for the Alboran Sea and Gibraltar Arc, Geology 17, 540-543.
Subduction-collision Orogen. , 2000). VrssERs et af. (1995) differ from PLATT and VrSSERS (1989) as they admit that the Africa-Iberia convergence was underway by the late Eocene, with stacking of continental units in the hanging-wall of a subduction zone, dipping presumably to the NW (cf. 508 A. Chalouan and A. Michard Pure appl. , VAN DER WAL and VISSERS, 1993). Likewise, ZECK (1996) hypothesises an African subduction beneath Iberia at the onset of the Betic-Rif orogeny during the EoceneOligocene, and makes no reference to an exotic Alboran domain.