Characteristics of observed strong motion accelerograms from the 2011 Lorca (Spain) Earthquake

Cabañas, Luis; Alcalde, Juan; Carreño, E.; Bravo, J. B.

doi:10.1007/s10518-013-9501-0

Cited by 18 publications

(9 citation statements)

References 11 publications

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“…The results obtained with the HM show an increment of expected accelerations near fault traces (in a factor of 2) in relation to the results of the CM approach. This is consistent with observations of very high ground motions in the epicentral areas of recent earthquakes, such as the 2009 L'Aquila and 2011 Lorca events (Akinci et al, 2010;Cabañas et al, 2014). This increment is achieved at the expense of decreasing expected accelerations in areas located farther away from faults.…”

Section: Discussionsupporting

confidence: 91%

Approach for combining fault and area sources in seismic hazard assessment: application in south-eastern Spain

Rivas-Medina

Benito

Gaspar‐Escribano

2018

Nat. Hazards Earth Syst. Sci.

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Abstract. This paper presents a methodological approach to seismic hazard assessment based on a hybrid source model composed of faults as independent entities and zones containing residual seismicity. The seismic potential of both types of sources is derived from different data: for the zones, the recurrence model is estimated from the seismic catalogue. For fault sources, it is inferred from slip rates derived from palaeoseismicity and GNSS (Global Navigation Satellite System) measurements. Distributing the seismic potential associated with each source is a key question when considering hybrid zone and fault models, and this is normally resolved using one of two possible alternatives: (1) considering a characteristic earthquake model for the fault and assigning the remaining magnitudes to the zone, or (2) establishing a cut-off magnitude, Mc, above which the seisms are assigned to the fault and below which they are considered to have occurred in the zone. This paper presents an approach to distributing seismic potential between zones and faults without restricting the magnitudes for each type of source, precluding the need to establish cut-off Mc values beforehand. This is the essential difference between our approach and other approaches that have been applied previously. The proposed approach is applied in southern Spain, a region of low-to-moderate seismicity where faults move slowly. The results obtained are contrasted with the results of a seismic hazard method based exclusively on the zone model. Using the hybrid approach, acceleration values show a concentration of expected accelerations around fault traces, which is not appreciated in the classic approach using only zones.

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Section: Discussionsupporting

confidence: 91%

Approach for combining fault and area sources in seismic hazard assessment: application in south-eastern Spain

Rivas-Medina

Benito

Gaspar‐Escribano

2018

Nat. Hazards Earth Syst. Sci.

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“…The five GMPEs previously selected are used in order to estimate the PGA and SA(T) for T = 0.1, 0.2, 0.3, 0.4, 0.5, 1.0 and 2.0 s applying the source conditions of the 2011 Lorca earthquake and taking into account site effects in the affected area. Figure 2 shows a comparison between the response spectra derived from the strong motion record at the Lorca station (see Cabanas et al 2013 for details) and the ones predicted by the five selected GMPEs (giving in this case the median plus/minus one sigma). The figure shows that the predicted spectrum is quite similar (or slightly higher) to the recorded one for T < 0.3 s, while that is exceeded by the actual spectrum for T < 0.3 s. In general, for the long period range, the recorded SA(T) fit quite well the median plus one sigma predicted spectra.…”

Section: Results Of the Simulation In Terms Of Pga And Response Spectramentioning

confidence: 99%

Models for reproducing the damage scenario of the Lorca earthquake

Rivas-Medina

Martínez-Cuevas

Quiros

et al. 2014

Bull Earthquake Eng

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A damage scenario modelling is developed and compared with the damage distribution observed after the 2011 Lorca earthquake. The strong ground motion models considered include five modern ground motion prediction equations (GMPEs) amply used worldwide. Capacity and fragility curves from the Risk-UE project are utilized to model building vulnerability and expected damage. Damage estimates resulting from different combinations of GMPE and capacity/fragility curves are compared with the actual damage scenario, establishing the combination that best explains the observed damage distribution. In addition, some recommendations are proposed, including correction factors in fragility curves in order to reproduce in a better way the observed damage in masonry and reinforce concrete buildings. The lessons learned would contribute to improve the simulation of expected damages due to future earthquakes in Lorca or other regions in Spain with similar characteristics regarding attenuation and vulnerability.

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“…Cabañas et al (2012) han logrado poner de manifiesto la presencia de desplazamiento de varios mm a partir del acelerograma registrado en Lorca con un proceso adaptado a tal fin.…”

Section: Física De La Tierraunclassified

Análisis de los parámetros de los acelerogramas registrados en los seísmos de Lorca, de interés para la Ingeniería.

Vidal

Rodríguez²,

Suriñach

et al. 2013

Fís. Tierra

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Seismic crisis occurred in Lorca (Murcia) on 11 th May 2011 originated an important number of accelerograms recorded in the IGN stations. The analysis of uniformly computed parameters has produced interesting results for Earthquake Engineering, in particular those recorded in Lorca. Strong ground motion has been specially observed in the horizontal component perpendicular to the Alhama de Murcia fault, at the origin of the earthquake. Values of PGA= 0,37g and CAV= 0.27g•s seems to be compensated by a short duration of the motion producing a macroseismic Intensity not greater than VII in Lorca. The contribution of near field component of ground motion due to the rupture propagation to and under the Lorca town was shown on acceleration, velocity and displacement time series and also on elastic response spectra.

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Characteristics of observed strong motion accelerograms from the 2011 Lorca (Spain) Earthquake

Cited by 18 publications

References 11 publications

Approach for combining fault and area sources in seismic hazard assessment: application in south-eastern Spain

Approach for combining fault and area sources in seismic hazard assessment: application in south-eastern Spain

Models for reproducing the damage scenario of the Lorca earthquake

Análisis de los parámetros de los acelerogramas registrados en los seísmos de Lorca, de interés para la Ingeniería.

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