Active faults, seismicity and stresses in an internal boundary of a tectonic arc (Campo de Dalías and Níjar, southeastern Betic Cordilleras, Spain)

Marín‐Lechado, Carlos; Galindo-Zaldı́var, Jesús; Rodrı́guez-Fernández, L.; Serrano, Inmaculada; Pedrera, Antonio

doi:10.1016/j.tecto.2004.11.001

Cited by 56 publications

(60 citation statements)

References 28 publications

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“…Onshore, this area includes the Contraviesa and Gádor Ranges constituted by the Alpujarride metamorphic complex, basement of the Neogene to Quaternary sediments of the Campo de Dalías, where recent deformation has been recognized (e.g. Martínez-Díaz and Hernández-Enrile, 2004;Marín-Lechado et al, 2005;Pedrera et al, 2012) (Fig. 2).…”

Section: Tectonics and Seismicity Of The Adra-almería Marginmentioning

confidence: 99%

“…(Zazo et al, 2003). These terraces provide information about recent uplift of the region with maximum values of 0.046 m ka −1 over the last 130 ka for the up-thrown block of the Loma del Viento (Zazo et al, 2003;Marín-Lechado et al, 2005) (Fig. 2).…”

Section: Tectonics and Seismicity Of The Adra-almería Marginmentioning

confidence: 99%

“…2). On the basis of pre-existing offshore commercial multichannel seismic reflection profiles from the Almería shelf, several authors suggest the presence of NW-SE trending faults and open, gentle folds extending up to 100 km in length in the offshore area (Rodríguez-Fernández and Martín-Penela, 1993;Martínez-Díaz and Hernández-Enrile, 2004;Marín-Lechado et al, 2005Pedrera et al, 2012).…”

Section: Tectonics and Seismicity Of The Adra-almería Marginmentioning

confidence: 99%

“…However, historical and archaeological records suggest that the Adra-Almería region has been affected by at least 50 destructive earthquakes (MSK Intensity > VIII) over the past 2000 yr (e.g. Marín-Lechado et al, 2005), providing evidence of a significant seismic hazard. The town of Almería was devastated by earthquakes in 1487, 1522 (I 0 = IX MSK) and 1658 (I 0 = VIII MSK).…”

Section: Tectonics and Seismicity Of The Adra-almería Marginmentioning

confidence: 99%

“…Campo de Dalías in the Almería province, SE Spain) has been studied in detail (e.g. Martínez-Díaz and Hernández-Enrile, 2004;Marín-Lechado et al, 2005Pedrera et al, 2012) (Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

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Acoustic and seismic imaging of the Adra Fault (NE Alboran Sea): in search of the source of the 1910 Adra earthquake

Gràcia

Bartolomé

Iacono

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract.Recently acquired swath-bathymetry data and high-resolution seismic reflection profiles offshore Adra (Almería, Spain) reveal the surficial expression of a NW-SE trending 20 km-long fault, which we termed the Adra Fault. Seismic imaging across the structure depicts a subvertical fault reaching the seafloor surface and slightly dipping to the NE showing an along-axis structural variability. Our new data suggest normal displacement of the uppermost units with probably a lateral component. Radiocarbon dating of a gravity core located in the area indicates that seafloor sediments are of Holocene age, suggesting present-day tectonic activity. The NE Alboran Sea area is characterized by significant low-magnitude earthquakes and by historical records of moderate magnitude, such as the M w = 6.1 1910 Adra Earthquake. The location, dimension and kinematics of the Adra Fault agree with the fault solution and magnitude of the 1910 Adra Earthquake, whose moment tensor analysis indicates normal-dextral motion. The fault seismic parameters indicate that the Adra Fault is a potential source of large magnitude (M w ≤ 6.5) earthquakes, which represents an unreported seismic hazard for the neighbouring coastal areas.

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Section: Tectonics and Seismicity Of The Adra-almería Marginmentioning

confidence: 99%

Section: Tectonics and Seismicity Of The Adra-almería Marginmentioning

confidence: 99%

Section: Tectonics and Seismicity Of The Adra-almería Marginmentioning

confidence: 99%

Section: Tectonics and Seismicity Of The Adra-almería Marginmentioning

confidence: 99%

“…Campo de Dalías in the Almería province, SE Spain) has been studied in detail (e.g. Martínez-Díaz and Hernández-Enrile, 2004;Marín-Lechado et al, 2005Pedrera et al, 2012) (Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

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Acoustic and seismic imaging of the Adra Fault (NE Alboran Sea): in search of the source of the 1910 Adra earthquake

Gràcia

Bartolomé

Iacono

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Seismicity and active tectonics in the Alboran Sea, Western Mediterranean: Constraints from an offshore‐onshore seismological network and swath bathymetry data

et al. 2015

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Seismicity and tectonic structure of the Alboran Sea were derived from a large amphibious seismological network deployed in the offshore basins and onshore in Spain and Morocco, an area where the convergence between the African and Eurasian plates causes distributed deformation. Crustal structure derived from local earthquake data suggests that the Alboran Sea is underlain by thinned continental crust with a mean thickness of about 20 km. During the 5 months of offshore network operation, a total of 229 local earthquakes were located within the Alboran Sea and neighboring areas. Earthquakes were generally crustal events, and in the offshore domain, most of them occurred at crustal levels of 2 to 15 km depth. Earthquakes in the Alboran Sea are poorly related to large‐scale tectonic features and form a 20 to 40 km wide NNE‐SSW trending belt of seismicity between Adra (Spain) and Al Hoceima (Morocco), supporting the case for a major left‐lateral shear zone across the Alboran Sea. Such a shear zone is in accord with high‐resolution bathymetric data and seismic reflection imaging, indicating a number of small active fault zones, some of which offset the seafloor, rather than supporting a well‐defined discrete plate boundary fault. Moreover, a number of large faults known to be active as evidenced from bathymetry, seismic reflection, and paleoseismic data such as the Yusuf and Carboneras faults were seismically inactive. Earthquakes below the Western Alboran Basin occurred at 70 to 110 km depth and hence reflected intermediate depth seismicity related to subducted lithosphere.

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Compressional tectonic inversion of the Algero-Balearic basin: Latemost Miocene to present oblique convergence at the Palomares margin (Western Mediterranean)

et al. 2015

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Interpretation of new multichannel seismic reflection profiles indicates that the Palomares margin was formed by crustal-scale extension and coeval magmatic accretion during middle to late Miocene opening of the Algero-Balearic basin. The margin formed at the transition between thinned continental crust intruded by arc volcanism and back-arc oceanic crust. Deformation produced during the later positive inversion of the margin offshore and onshore is partitioned between~N50°E striking reverse faults and associated folds like the Sierra Cabrera and Abubacer anticlines and N10-20°E sinistral strike-slip faults like Palomares and Terreros faults. Parametric subbottom profiles and multibeam bathymetry offshore, structural analysis, available GPS geodetic displacement data, and earthquake focal mechanisms jointly indicate that tectonic inversion of the Palomares margin is currently active. The Palomares margin shows a structural pattern comparable to the north Maghrebian margins where Africa-Eurasia plate convergence is accommodated by NE-SW reverse faults, NNW-SSE sinistral faults, and WNW-ESE dextral ones. Contractive structures at this margin contribute to the general inversion of the Western Mediterranean since~7 Ma, coeval to inversion at the Algerian margin. Shortening at the Alboran ridge and Al-Idrisi faults occurred later, since 5 Ma, indicating a westward propagation of the compressional inversion of the Western Mediterranean.

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Active faults, seismicity and stresses in an internal boundary of a tectonic arc (Campo de Dalías and Níjar, southeastern Betic Cordilleras, Spain)

Cited by 56 publications

References 28 publications

Acoustic and seismic imaging of the Adra Fault (NE Alboran Sea): in search of the source of the 1910 Adra earthquake

Acoustic and seismic imaging of the Adra Fault (NE Alboran Sea): in search of the source of the 1910 Adra earthquake

Seismicity and active tectonics in the Alboran Sea, Western Mediterranean: Constraints from an offshore‐onshore seismological network and swath bathymetry data

Compressional tectonic inversion of the Algero-Balearic basin: Latemost Miocene to present oblique convergence at the Palomares margin (Western Mediterranean)

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