Active faulting offshore SE Spain (Alboran Sea): Implications for earthquake hazard assessment in the Southern Iberian Margin
16 pages, 7 figures
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| Format: | artículo biblioteca |
| Language: | English |
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Elsevier
2006-01-31
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| Subjects: | Alboran Sea, Carboneras Fault zone, Strike-slip faulting, Submarine channels, Seismicity, |
| Online Access: | http://hdl.handle.net/10261/27399 |
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dig-icm-es-10261-273992020-11-10T10:12:58Z Active faulting offshore SE Spain (Alboran Sea): Implications for earthquake hazard assessment in the Southern Iberian Margin Gràcia, Eulàlia Pallàs, R. Soto, J. I. Comas, M. C. Moreno, Ximena Massana, Eulàlia Santanach, Pere Díez Tagarró, Susana García, Marga Dañobeitia, Juan José HITS scientific party Bartolomé, Rafael Farran, Marcel-lí Alboran Sea Carboneras Fault zone Strike-slip faulting Submarine channels Seismicity 16 pages, 7 figures The southern margin of the Iberian Peninsula hosts the convergent boundary between the European and African Plates. The area is characterised by low to moderate magnitude shallow earthquakes, although large historical events have also occurred. In order to determine the possible sources of these events, we recently acquired swath-bathymetry, TOBI sidescan sonar and high-resolution seismic data on the Almería Margin (Eastern Alboran Sea). The new dataset reveals the offshore continuation of the NE–SW trending Carboneras Fault, a master fault in the Eastern Betic Shear Zone, and its associated structures (N150 and NS faults). These structures are active since they cut the Late Quaternary sedimentary units. The submarine Carboneras Fault zone is 100 km long, 5–10 km wide, and is divided into two N045 and N060 segments separated by an underlapping restraining stepover. Geomorphic features typically found in subaerial strike-slip faults, such as deflected drainage, water gaps, shutter ridges, pressure ridges and “en echelon” folds suggest a strike-slip motion combined with a vertical component along the submarine Carboneras Fault. Considering the NNW–SSE regional shortening axis, a left-lateral movement is deduced for the Carboneras Fault, whereas right-lateral and normal components are suggested for the associated N150 and NS faults, respectively. The offshore portion of this fault is at least twice as long as its onshore portion and together they constitute one of the longest structures in the southeastern Iberian Margin. Despite the fact that present day seismicity in the Almería margin seems to be associated with the N150 to NS faults, the Carboneras Fault is a potential source of large magnitude (Mw not, vert, similar7.2) events. Hence, the Carboneras Fault zone could pose a significant earthquake and tsunami hazard to the coasts of Spain and North Africa, and should therefore be considered in any hazard re-evaluation The authors acknowledge the support of the MCYT Acción Especial HITS (REN2000-2150-E), European Commission European Access of Seafloor Survey Systems EASSS-III programme (HPRI-CT99-0047), Spanish national Project IMPULS (REN2003-05996MAR), ESF EuroMargins WESTMED project (01-LEG-EMA22F and Acción Especial REN2002-11230E-MAR), and funding by Generalitat de Catalunya, research group SGR2001-0081 Peer reviewed 2010-09-02T11:40:55Z 2010-09-02T11:40:55Z 2006-01-31 artículo http://purl.org/coar/resource_type/c_6501 Earth and Planetary Science Letters 241(3-4): 734-749 (2006) 0012-821X http://hdl.handle.net/10261/27399 10.1016/j.epsl.2005.11.009 en https://doi.org/10.1016/j.epsl.2005.11.009 none 5867 bytes application/pdf Elsevier |
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Alboran Sea Carboneras Fault zone Strike-slip faulting Submarine channels Seismicity Alboran Sea Carboneras Fault zone Strike-slip faulting Submarine channels Seismicity |
| spellingShingle |
Alboran Sea Carboneras Fault zone Strike-slip faulting Submarine channels Seismicity Alboran Sea Carboneras Fault zone Strike-slip faulting Submarine channels Seismicity Gràcia, Eulàlia Pallàs, R. Soto, J. I. Comas, M. C. Moreno, Ximena Massana, Eulàlia Santanach, Pere Díez Tagarró, Susana García, Marga Dañobeitia, Juan José HITS scientific party Bartolomé, Rafael Farran, Marcel-lí Active faulting offshore SE Spain (Alboran Sea): Implications for earthquake hazard assessment in the Southern Iberian Margin |
| description |
16 pages, 7 figures |
| format |
artículo |
| topic_facet |
Alboran Sea Carboneras Fault zone Strike-slip faulting Submarine channels Seismicity |
| author |
Gràcia, Eulàlia Pallàs, R. Soto, J. I. Comas, M. C. Moreno, Ximena Massana, Eulàlia Santanach, Pere Díez Tagarró, Susana García, Marga Dañobeitia, Juan José HITS scientific party Bartolomé, Rafael Farran, Marcel-lí |
| author_facet |
Gràcia, Eulàlia Pallàs, R. Soto, J. I. Comas, M. C. Moreno, Ximena Massana, Eulàlia Santanach, Pere Díez Tagarró, Susana García, Marga Dañobeitia, Juan José HITS scientific party Bartolomé, Rafael Farran, Marcel-lí |
| author_sort |
Gràcia, Eulàlia |
| title |
Active faulting offshore SE Spain (Alboran Sea): Implications for earthquake hazard assessment in the Southern Iberian Margin |
| title_short |
Active faulting offshore SE Spain (Alboran Sea): Implications for earthquake hazard assessment in the Southern Iberian Margin |
| title_full |
Active faulting offshore SE Spain (Alboran Sea): Implications for earthquake hazard assessment in the Southern Iberian Margin |
| title_fullStr |
Active faulting offshore SE Spain (Alboran Sea): Implications for earthquake hazard assessment in the Southern Iberian Margin |
| title_full_unstemmed |
Active faulting offshore SE Spain (Alboran Sea): Implications for earthquake hazard assessment in the Southern Iberian Margin |
| title_sort |
active faulting offshore se spain (alboran sea): implications for earthquake hazard assessment in the southern iberian margin |
| publisher |
Elsevier |
| publishDate |
2006-01-31 |
| url |
http://hdl.handle.net/10261/27399 |
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