Intraplate stress state from finite element modelling: The southern border of the Spanish Central System

Martín-Velázquez, Silvia; Muñoz, Gerardo de Vicente; Elorza, Francisco Javier

doi:10.1016/j.tecto.2009.03.024

Cited by 12 publications

(11 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The strength models obtained from the combination of the three stress regimes with the two rheologies were used as ) and the peculiarities of the tectonic regime in the peninsular centre (Gölke and Coblentz 1996;Andeweg, 2002;Tejero and Ruiz, 2002;Jiménez-Munt and Negredo, 2003;De Vicente et al, 2008) suggest that the current tectonic stress in the Iberian Peninsula should be close to ~10 MPa without exceeding 25 MPa (Martín-Velázquez et al, 2009). Consequently, the models were deformed by a constant pressure of 10 MPa in each of both lateral sides (Fig.…”

Section: Boundary Conditionsmentioning

confidence: 99%

Strength of the Iberian intraplate lithosphere: Cenozoic deformations and seismicity

Martín-Velázquez

Muñoz

Gómez-Ortíz

et al. 2016

Journal of Iberian Geology

View full text Add to dashboard Cite

Previous studies about the strength of the lithosphere in the center of Iberia fail to resolve the depth of earthquakes because of the rheological uncertainties. Therefore, new contributions are considered (the crustal structure from a density model) and several parameters (tectonic regime, mantle rheology, strain rate) are checked in this paper to properly examine the role of lithospheric strength in the intraplate seismicity and the Cenozoic evolution. The strength distribution with depth, the integrated strength, the effective elastic thickness and the seismogenic thickness have been calculated by a finite element modelling of the lithosphere across the Central System mountain range and the bordering Duero and Madrid sedimentary basins. Only a dry mantle under strike-slip/extension and a strain rate of 10 -15 s , causes a strong lithosphere. The integrated strength and the elastic thickness are lower in the mountain chain than in the basins. This heterogeneity has been maintained since the Cenozoic and determine the mountain uplift and the biharmonic folding of the Iberian lithosphere during the Alpine deformations. The seismogenic thickness bounds the seismic activity in the upper-middle crust, and the decreasing crustal strength from the Duero Basin towards the Madrid Basin is related to a parallel increase in Plio-Quaternary deformations and seismicity. However, elasto-plastic modelling shows that current African-Eurasian convergence is resolved elastically or ductilely, which accounts for the low seismicity recorded in this region.Keywords: lithospheric strength, effective elastic thickness, seismogenic thickness, Iberia, finite element modelling ResumenLos estudios previos sobre resistencia de la litosfera en el centro de Iberia no logran resolver la profundidad de los terremotos debido a las incertidumbres reológicas. Por eso, en este trabajo se han considerado nuevas contribuciones (estructura cortical obtenida de un modelo de densidad) y se han comprobado varios parámetros (régimen tectónico, reología del manto, tasa de deformación) para examinar adecuadamente el papel de la resistencia de la litosfera en la sismicidad intraplaca y en la evolución Cenozoica. Mediante una modelización de elementos finitos, se ha calculado la distribución de la resistencia con la profundidad, la resistencia integrada, el espesor elástico efectivo y el espesor sismogénico en una sección litosférica que atraviesa la cadena montañosa del Sistema Central y las cuencas sedimentarias del Duero y Madrid. Sólo un manto seco en desgarre/extensión y una tasa de deformación de 10 -15 s -1, o bajo extensión y 10 -16 s -1 , origina una litosfera resistente. La resistencia integrada y el espesor elástico son más bajos en el sistema montañoso que en las cuencas. Estas anisotropías se han mantenido desde el Cenozoico y determinan el levantamiento de la cadena y el plegamiento biarmónico de la litosfera Ibérica durante las deformaciones alpinas. El espesor sismogénico limita la actividad sísmica en la corteza superior-media, y l...

show abstract

Section: Boundary Conditionsmentioning

confidence: 99%

Strength of the Iberian intraplate lithosphere: Cenozoic deformations and seismicity

Martín-Velázquez

Muñoz

Gómez-Ortíz

et al. 2016

Journal of Iberian Geology

View full text Add to dashboard Cite

show abstract

“…In this geological framework, the main tectonic structures have a conjugate orientation, with NE-SW and NW-SE trending . All of these structures are related with the aforementioned lithospheric flexure defined by the basement geometry and differential filling and thickness of Neogene sequences Giner et al, 1996;Cloetingh et al, 2002;De Vicente et al, 2007Martín-Velázquez et al, 2009).…”

Section: Geodynamic and Geologic Backgroundmentioning

confidence: 99%

“…This convergence comes from the Pyrenean compression (N-to NE-trending), the Betic compression (SSE-trending), the Mid-Atlantic Ocean Ridge (MAOR) push (W-trending) and the Valencia Through extension (WNW-trending). At this point, different authors explain vertical movements at SCS as result of the lithospheric folding (Giner, 1996;De Vicente et al, 1996;Cloetingh et al, 2002;De Vicente et al, 2007Martín-Velázquez et al, 2009). Since the lithospheric folding implies large-scale deformation and large wavelength in vertical movements, the active tectonic slip-rate operating in the SCS has to be estimated from Pleistocene, at least.…”

Section: Geodynamic and Geologic Backgroundmentioning

confidence: 99%

“…Pérez-López et al (2005) described the stress-field at the South Border of the SCS as strike-slip to uniaxial extension from Eocene to present. Martín-Velázquez et al (2009) modeled this stress-field by using finite elements and a punctual rheological model obeying the thermal model of Tejero and Ruiz (2002). The relevance of this model is the simulation of the stress state at the surface of the SCS, where the present topography plays as tectonic loading for faults.…”

Section: Geodynamic and Geologic Backgroundmentioning

confidence: 99%

“…However, fault parametrization for hazard purposes is still a controversy. In this sense, the geothermal features (Jiménez-Díaz et al, 2012), the analogue models of the lithosphere (Fernández-Lozano et al, 2011) and numerical models (Martín-Velázquez et al, 2009) underneath the SCS, could shed light on the fault width which could be load for trigger either moderates or destructive earthquakes.…”

Section: Geodynamic and Geologic Backgroundmentioning

confidence: 99%

See 2 more Smart Citations

Recent tectonic model for the Upper Tagus Basin (central Spain)

Giner-Robles

Pérez‐López

Silva

et al. 2012

Journal of Iberian Geology

View full text Add to dashboard Cite

Active tectonics within the Upper Tagus Basin is related to the lithospheric flexure affecting the Palaeozoic basement of the basin. This flexure displays NE-SW trending. Besides, this structure is in agreement with the regional active stress field defined by the maximum horizontal stress with NW-SE trending. In this tectonic framework, irregular clusters of instrumental seismicity (Mw< 5.0) fade in the zone bounded by the Tagus River and the Jarama River valleys. These clusters are related to major NW-SE trending faults of suspected strike-slip kinematics. Moreover, reverse faults with NE-SW trending are affected by the strike-slip system as well. Despite the reverse faults are in agreement with the present SHMAX orientation, though, they apparently are blocked as seismogenic sources (scarce instrumental seismicity recorded today). In addition, we have determined the regional and local stress/ strain fields and two different fracture patterns were observed. Hence, we have divided the area in two zones: (1) the lateral bands of the basin, defined by reverse faulting (NE-SW trending) and strike-slip faulting (NW-SE trending) and (2) the central zone of the basin characterized by shallow normal faulting and NE-SW trending strike-slip faults. Furthermore, surface faulting and liquefaction structures are described affecting Middle to Late Pleistocene fluvial deposits, suggesting intrabasinal palaeoseismic activity (5.5 < M < 6.5) during the Late Quaternary. The obtained structural and tectonic information has been used to classify and characterize the Upper Tagus Basin as a semi-stable intraplate seismogenic zone, featured by Pleistocene slip-rates < 0.02 mm/yr. This value is low but it affords the occurrence of Pleistocene paleoearthquakes.

show abstract

Hydrogeochemistry of granitic mountain zones and the influence of adjacent sedimentary basins at their tectonic borders: the case of the Spanish Central System batholith

et al. 2020

View full text Add to dashboard Cite

Intraplate stress state from finite element modelling: The southern border of the Spanish Central System

Cited by 12 publications

References 57 publications

Strength of the Iberian intraplate lithosphere: Cenozoic deformations and seismicity

Strength of the Iberian intraplate lithosphere: Cenozoic deformations and seismicity

Recent tectonic model for the Upper Tagus Basin (central Spain)

Hydrogeochemistry of granitic mountain zones and the influence of adjacent sedimentary basins at their tectonic borders: the case of the Spanish Central System batholith

Contact Info

Product

Resources

About