Seismotectonics of Portugal and its adjacent Atlantic area

Borges, José Fernando; Fitas, A. J. S.; Bezzeghoud, Mourad; Teves-Costa, Paula

doi:10.1016/s0040-1951(00)00291-2

Cited by 121 publications

(99 citation statements)

References 16 publications

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“…Stich et al (2005) determined a focal mechanism of a reverse faulting. This is in agreement with other focal mechanisms calculated for this region (Borges et al 2001). However, this focal mechanism is not well constrained due to the lack of data.…”

Section: Relocation Using the Bakun And Wentworth Methodology (1997)supporting

confidence: 91%

Intensity-distance attenuation laws for the Portugal mainland using intensity data points

Goff¹,

Borges²,

Bezzeghoud³

2014

Geophysical Journal International

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S U M M A R YIn this study, new intensity-distance attenuation law is presented, using directly the intensity observations, rather than the subjective, and sometimes controversial, isoseismal lines. This intensity-distance attenuation law is the only one defined for Portugal mainland, which is expressed as a function of magnitude. We computed this attenuation law using the slope and the intercept of the logarithmic regression of 25 events, with magnitudes between 4.4 and 6.2.Using the Bakun and Wentworth method (1997), this new attenuation law allows performing better results in the earthquake epicentral position and magnitude estimations of the 1909 Benavente event than the Atkinston and Boore attenuation law (1997). This law also gives good results in the study of site effects, presenting good matches between intensity residuals and geological structures where site effects are expected.

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Section: Relocation Using the Bakun And Wentworth Methodology (1997)supporting

confidence: 91%

Intensity-distance attenuation laws for the Portugal mainland using intensity data points

Goff¹,

Borges²,

Bezzeghoud³

2014

Geophysical Journal International

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“…These nodal planes do not match any known outcropping active structure in the area suggesting that the event could have been produced by a blind thrust beneath the Cenozoic sedimentary fill (Cabral 1995, Stich et al 2005, Cabral et al, 2013. However, this focal mechanism is similar to others obtained for this region (Borges et al 2001), and it is consistent with the stress field inferred for this area (Ribeiro et al 1996, Stich et al 2003, Cabral et al 2003.…”

Section: Location Magnitude and Focal Mechanismsupporting

confidence: 69%

“…Focal mechanism of the 23 April 1909 earthquake (larger symbol) determined by Stich et al (2005). The other mechanisms were determined by Moreira (1991b), Borges et al (2001), Ribeiro et al (1996) and Stich et al (2003) (from Stich et al 2005). …”

Section: Location Magnitude and Focal Mechanismmentioning

confidence: 95%

Los terremotos del Bajo Valle del Tajo (Portugal): Lisboa 26 de Enero de 1531 y Benavente 23 de Abril de 1909

2017

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Abstract. The Lower Tagus Valley (LTV) has been the source of several local earthquakes that affected the region of Lisbon, in the central part of Portugal. In spite of absence of strong earthquakes during the last 100 years, past events have produced large damage in this area. We present the state of the art concerning the last two major earthquakes, which occurred in 1531 and 1909. The effects of both events are described, based on coeval reports already interpreted by several authors. The source parameters determined by different authors are also presented. The characterization of the seismogenic potential of the LTV is very important to better estimate the seismic hazard and risk of the region of Lisbon and Tagus Valley.

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“…According to data from borehole breakouts and earthquake focal mechanisms, the maximum horizontal compressive stress presently trends NW-SE to WNW-ESE (Ribeiro et al 1996;Borges et al 2001). …”

Section: Regional Geological Setting and Seismicitymentioning

confidence: 99%

Active surface faulting or landsliding in the Lower Tagus Valley (Portugal)? A solved controversy concerning the Vila Chã de Ourique site

et al. 2010

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Seismotectonics of Portugal and its adjacent Atlantic area

Cited by 121 publications

References 16 publications

Intensity-distance attenuation laws for the Portugal mainland using intensity data points

Intensity-distance attenuation laws for the Portugal mainland using intensity data points

Los terremotos del Bajo Valle del Tajo (Portugal): Lisboa 26 de Enero de 1531 y Benavente 23 de Abril de 1909

Active surface faulting or landsliding in the Lower Tagus Valley (Portugal)? A solved controversy concerning the Vila Chã de Ourique site

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