Tectonic setting of the recent damaging seismic series in the Southeastern Betic Cordillera, Spain

Rodríguez-Escudero, Emilio; Martínez‐Díaz, J. J.; Álvarez‐Gómez, José A.; Insúa-Arévalo, Juan M.; Villar, Ramón Capote del

doi:10.1007/s10518-013-9551-3

Cited by 9 publications

(10 citation statements)

References 39 publications

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“…The Eastern Betic Cordillera is characterized by low to moderate instrumental seismicity with typical magnitudes of M W < 5.5 (García‐Mayordomo, Gaspar‐Escribano, & Benito, 2007; Rodríguez‐Escudero et al., 2014). In the last decade, the biggest earthquake recorded was the 2011 M W 5.1 Lorca earthquake (López‐Comino et al., 2012), which had an intensity I EMS VII and reached a maximum peak acceleration of 0.36 g, resulting in heavy casualties −9 people died–and significant economic losses.…”

Section: Seismogenic Sources In the Eastern Betic Shear Zonementioning

confidence: 99%

Physics‐Based Earthquake Simulations in Slow‐Moving Faults: A Case Study From the Eastern Betic Shear Zone (SE Iberian Peninsula)

et al. 2021

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Earthquake hazard forecasting often has to deal with the scarcity of seismicity data, the complexity of fault segmentation, the uncertainties derived from the characterization of seismogenic sources, the dynamics of earthquake rupture and the recurrence model used. Instrumental earthquake recordings are available only since about 1900 and they are not reliable until several decades later. There are a few regions with representative historical data of large earthquakes for more than 2000 years in Italy (Boschi, 2000), Japan (Ishibashi, 2004), and China (Liu et al., 2011) that allow acquisition of reliable major earthquake magnitudes and recurrence statistics. In regions with low to moderate seismicity, such as some zones of the western Mediterranean or intracontinental areas, earthquake hazard estimation is especially challenging (see e.g., Estay et al., 2016;Gamage & Venkatesan, 2019;Perea & Atakan, 2007). Most of the large, and consequently damaging earthquakes, have recurrence times on the order of hundreds or thousands of years. Since historical catalogs are often scarce and imprecise, the paleoseismic record provides valuable data about rare but devastating major events and long-term recurrence times, but these data usually have large uncertainties (McCalpin, 2009). Often, the slow fault systems, besides generating low seismicity in terms of frequency, show little geomorphological expression. This makes it difficult to define the segmentation of fault traces and the parameters relating to their 3D geometry and their kinematics. Fault system geometry also plays an important role in the stress interactions that control the earthquake ruptures and therefore magnitude and recurrence statistics (e.g.

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Section: Seismogenic Sources In the Eastern Betic Shear Zonementioning

confidence: 99%

Physics‐Based Earthquake Simulations in Slow‐Moving Faults: A Case Study From the Eastern Betic Shear Zone (SE Iberian Peninsula)

et al. 2021

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“…1A). It is characterized by instrumental seismicity of moderate to low magnitude capable of producing catastrophic events (e.g., Rodríguez-Escudero et al, 2014). Historical and paleoseismic data show M w > 6.0 seismic ruptures during the Holocene (Martínez-Díaz et al, 2018).…”

Section: Geological Setting and Samplingmentioning

confidence: 99%

Pulverized quartz clasts in gouge of the Alhama de Murcia fault (Spain): Evidence for coseismic clast pulverization in a matrix deformed by frictional sliding

Rodríguez-Escudero

Martínez‐Díaz

Giner-Robles

et al. 2020

Geology

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The fault gouge of the Alhama de Murcia fault (southeast Spain) shows a texture that resembles a mylonite, including a prominent foliation, S-C fabric, and isoclinal folds. It also embeds a large number of isolated pulverized quartz clasts (PQCs). Structural analysis indicates that the gouge fabric was mainly developed by slow frictional sliding along phyllosilicate-lined Riedel shear bands during continued shearing. In contrast, the PQCs show tensile fracture network features that are typically reported in seismically pulverized rocks found along seismogenic faults. This suggests that quartz-clast pulverization was due to a transient dilatational mechanism rather than shearing. We propose that the PQCs are the result of a rapid confined stress drop related to transient tensile stresses during coseismic ruptures that interrupt creep faulting along the gouge zone. The present study suggests that there is probably a large amount of evidence for paleoseismicity in fault rocks that is currently overlooked.

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“…The INTERGEO project, supported in 2013 by the Spanish research program, was conceived to unravel the morphology of different active faults of the EBSZ by the acquisition of six high-resolution controlled source multichannel seismic transects. Here, we show the model obtained from one of these lines, which samples the Algezares-Casas Nuevas Fault, an oblique reverse fault formed in a strike-slip regional context (Martín- Banda, 2020;Martín-Banda et al, 2016, 2021Rodríguez-Escudero et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Characterization of the shallow subsurface structure across the Carrascoy Fault System (SE Iberian Peninsula) using P-wave tomography and Multichannel Analysis of Surface Waves

Handoyo

DeFelipe

Banda

et al. 2022

GeA

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The seismicity in the SE Iberian Peninsula is distributed parallel to the coast in a well-developed strike-slip fracture system known as the Eastern Betic Shear Zone (EBSZ). This work focuses on the characterization of the shallow subsurface structure of the Algezares-Casas Nuevas Fault, within the Carrascoy Fault System of the EBSZ. The Carrascoy Fault borders the Guadalentín Depression to the south, which is a densely populated area with extensive agricultural activity. Therefore, this faults system represents a seismic hazard with significant social and economic implications. We have constructed two velocity-depth models based on P-wave tomography and Multichannel Analysis of Surface Waves (MASW) acquired from seismic reflection data. The resulting velocity models have allowed us to interpret the first ~250m depth and have revealed: i) the thickness of the critical zone; ii) the geometry of the Algezares-Casas Nuevas Fault; iii) the depth of the Messinian/Tortonian contact and iv) the presence of blind thrusts and damage zones under the Guadalentín Depression. Our results have also helped us to estimate an apparent vertical slip rate of 0.66±0.06m/ky for the Algezares-Casas Nuevas Fault since 209.1±6.2ka. Our results provide a methodological and backflow protocol to study the shallow subsurface of active faults, complementing previous geological models based on paleoseismological trenches, and can be used to improve the seismic hazard assessment of tectonically active regions around the world.

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Tectonic setting of the recent damaging seismic series in the Southeastern Betic Cordillera, Spain

Cited by 9 publications

References 39 publications

Physics‐Based Earthquake Simulations in Slow‐Moving Faults: A Case Study From the Eastern Betic Shear Zone (SE Iberian Peninsula)

Physics‐Based Earthquake Simulations in Slow‐Moving Faults: A Case Study From the Eastern Betic Shear Zone (SE Iberian Peninsula)

Pulverized quartz clasts in gouge of the Alhama de Murcia fault (Spain): Evidence for coseismic clast pulverization in a matrix deformed by frictional sliding

Characterization of the shallow subsurface structure across the Carrascoy Fault System (SE Iberian Peninsula) using P-wave tomography and Multichannel Analysis of Surface Waves

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