Analysis of the 2012–2013 Torreperogil-Sabiote seismic swarm

Hamdache, Mohamed; Peláez, José A.; Henares, Jesús; Damerdji, Y.; Sawires, Rashad

doi:10.1016/j.pce.2016.01.003

Cited by 4 publications

(3 citation statements)

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“…Swarms are often related to volcanic phenomena (Benoit & McNutt, 1996; Endo et al., 1981; Hill, 1977; Hurst & McGinty, 1999; McNutt, 1996; Power et al., 1994; among others) and geothermal regions (Dziak et al., 2003; Hainzl & Fischer, 2002). However, they can also occur in tectonically active contexts, whether on plate boundaries (e.g., Hamdache et al., 2019, 2016; Llenos et al., 2009; Lohman & McGuire, 2007; Vidale et al., 2006; Vidale & Shearer, 2006) or interplate rifts (e.g., Ibs‐von Seht et al., 2008; Stankova et al., 2008). This type of seismic sequence is often attributed to areas of the crust with many heterogeneities (Udías & Mezcua, 1986), to hidden influence of fluids (Hatch et al., 2020; Špičák et al., 2005), or to near aseismic fault‐slip (Hatch et al., 2020; McGuire et al., 2005; Roland & McGuire, 2009), and are often characterized by a hypocenter migration (e.g., Hainzl, 2004; Hayashi & Morita, 2003; Kyriakopoulos et al., 2013; Waite & Smith, 2002).…”

Section: Introductionmentioning

confidence: 99%

The Role of Faults as Barriers in Confined Seismic Sequences: 2021 Seismicity in the Granada Basin (Betic Cordillera)

et al. 2022

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Fault barriers are key structures for studying seismic hazard in regions of intense brittle deformation. The interaction between fault sets affects their seismogenic behavior, if some of them act as barriers. The Granada Basin, in the Betic Cordillera, is a region affected by shallow brittle deformation, as it was the scenario for the recent Granada 2021 seismic sequence. This seismicity presented a swarm behavior at the beginning of the sequence, followed by mainshock‐aftershock features. Geological and gravity data presented here reveal that the basement is affected by two sets of NW‐SE and NE‐SW normal faults and intensely deformed by vertical NW‐SE joints. Improved relocation of the Granada 2021 seismicity reveals a confined chimney‐shape seismicity caused by the activity of a 2 km long NW‐SE normal fault segment. The confinement of the sequence is associated with the NE‐SW fault set acting as a barrier that restricts the rupture area, limiting the maximum magnitude, and favoring the recurrence of events with smaller magnitude. The chimney‐shape of the seismic sequence suggests that the deformation is propagated vertically to the surface, facilitated by preexisting fractures. The shallow extensional deformation during the uplift of the central Betic Cordillera drove the activity of the local structures obliquely to the regional extensional trends, as evidenced by the seismic sequence. This multidisciplinary study improves the knowledge on the origin of the Granada Basin and underlies the important role of preexisting fractures on fault segmentation and seismic propagation, decreasing the seismic potential of this area.

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Section: Introductionmentioning

confidence: 99%

The Role of Faults as Barriers in Confined Seismic Sequences: 2021 Seismicity in the Granada Basin (Betic Cordillera)

et al. 2022

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“…As an example, relative distance mean errors below 100 m were obtained for earthquakes with magnitude greater than mbLg 3.0 and between 100 and 200 m, on average, for events with magnitude ranging between mbLg 2.0 and 3.0. In certain cases, such as the previously quoted Torreperogil‐Sabiote 2012–2013 seismic sequence, epicenter distribution broadly defines alignments [ Peláez et al ., ; Sánchez Gómez et al ., ; Rueda et al ., ; Morales et al ., ; Serrano et al ., ; Hamdache et al ., ].…”

Section: Methodsmentioning

confidence: 99%

“…The Torreperogil‐Sabiote 2012–2013 seismic series is by far the most important and the most studied in the region [e.g., Pedrera et al ., ; Morales et al ., ; Hamdache et al ., ]. More than 2200 earthquakes were located by the IGN, being 677 of them relocated for this work.…”

Section: Seismicitymentioning

confidence: 99%

Deformation style and controlling geodynamic processes at the eastern Guadalquivir foreland basin (Southern Spain)

et al. 2017

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The tectonic structure of the Guadalquivir foreland basin becomes complex eastward evolving from a single depocenter to a compartmented basin. The deformation pattern within the eastern Guadalquivir foreland basin has been characterized by combining seismic reflection profiles, boreholes, and structural field data to output a 3‐D model. High‐dipping NNE‐SSW to NE‐SW trending normal and reverse fault arrays deform the Variscan basement of the basin. These faults generally affect Tortonian sediments, which show syntectonic features sealed by the latest Miocene units. Curved and S‐shaped fault traces are abundant and caused by the linkage of nearby fault segments during lateral fault propagation. Preexisting faults were reactivated either as normal or reverse faults depending on their position within the foreland. At Tortonian time, reverse faults deformed the basin forebulge, while normal faults predominated within the backbulge. Along‐strike variation of the Betic foreland basin geometry is supported by an increasing mechanical coupling of the two plates (Alborán Domain and Variscan basement) toward the eastern part of the cordillera. Thus, subduction would have progressed in the western Betics, while it would have failed in the eastern one. There, the initially subducted Iberian paleomargin (Nevado‐Filábride Complex) was incorporated into the upper plate promoting the transmission of collision‐related compressional stresses into the foreland since the middle Miocene. Nowadays, compression is still active and produces low‐magnitude earthquakes likely linked to NNE‐SSW to NE‐SW preexiting faults reactivated with reverse oblique‐slip kinematics. Seismicity is mostly concentrated around fault tips that are frequently curved in overstepping zones.

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