Local site effect microzonation of Lorca town (SE Spain)

Navarro, Manuel; García‐Jerez, Antonio; Alcalá, Francisco; Vidal, F.; Enomoto, Takahisa

doi:10.1007/s10518-013-9491-y

Cited by 45 publications

(35 citation statements)

References 35 publications

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“…Actually, at the array SP7 position (Fig. ), the obtained value of Vs30 was of 536 m/s according to Navarro et al (; ), which the EC8 site classification gives a site code of B1 (490–620 m/s) and where the Vs30 result obtained with MASW method was analogous. In order to support that in Fig.…”

Section: Resultsmentioning

confidence: 79%

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Shear‐wave velocity based seismic microzonation of Lorca city (SE Spain) from MASW analysis

Martínez‐Pagán

Navarro

Pérez‐Cuevas

et al. 2014

Near Surface Geophysics

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Many populated areas located in moderate seismic risk regions have been hit by earthquakes of moderate magnitude which, surprisingly, have caused very serious damage to buildings and led to the loss of human life. The city of Lorca (SE Spain) is a clear example. On 11 May 2011, two main shocks occurred in the vicinity of Lorca city with a maximum magnitude of 5.1 Mw causing some casualties and serious widespread damage in the city and its surroundings. Most of the damage was concentrated in certain districts in the city, while other parts remained intact. Actually, in Lorca, investigators detected both a clear example of seismic site effect and a seismic wave amplification occurrence due to the type of geological materials on which the city is located. For this reason, several studies are being carried out in Lorca city to assess the actual contribution of the soil conditions to the seismic amplification phenomena. In these studies, the shear wave velocity plays a key role as a parameter for evaluating the dynamic behaviour of the shallowest geological materials. Consequently, site characterization applied to calculating seismic hazard is usually based on the near surface shear‐wave velocity distribution. This study looked at the average shear‐wave velocity for the uppermost 30 m of ground, which is referred to as Vs30. The Vs30 values obtained from multichannel analysis of surface waves (MASW) were used to create a new soil classification map of Lorca city. Thus, the derived Vs30 map was transformed into the NEHRP and Eurocode 8 (EC8) standards. In Lorca city, the softness and the thickness of shallow geological formations have been observed as two important factors that affected the level of ground shaking and the degree of damage. The results show that there is a significant correlation between the Vs30 values and the damage distribution within the city.

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Section: Resultsmentioning

confidence: 79%

“…In fact, the authors are obtaining promising findings related to those factors in regards to the degree of damage and its distribution in Lorca city (Navarro et al . ).…”

Section: Discussionmentioning

confidence: 97%

Shear‐wave velocity based seismic microzonation of Lorca city (SE Spain) from MASW analysis

Martínez‐Pagán

Navarro

Pérez‐Cuevas

et al. 2014

Near Surface Geophysics

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“…La mayor vulnerabilidad de los edificios de HA respecto de los de fábrica (Figura 4a) puede deberse en parte al diferente tipo de suelo en la parte de la ciudad de construcción más reciente (39), pero también a las prácticas generalizadas en el proyecto de estructuras de HA.…”

Section: Consideraciones Sobre La Norma Sísmica Actualunclassified

Comportamiento de los edificios de HA con tabiquería durante el sismo de Lorca de 2011: aplicación del método FAST

Gómez-Martínez¹,

Pérez-García²,

Luca³

et al. 2015

Inf. constr.

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“…El municipio de Lorca ha sido objeto de estudios previos de peligrosidad y vulnerabilidad sísmica tanto a escala regional (proyecto RISMUR, Benito et al, 2006, DGPC., 2006) como a escala local (ITGE, 1992;Navarro et al 2006, Navarro et al, 2008, Navarro et al, 2012.…”

Section: Estudios Previos Realizados En Lorcaunclassified

Caracterización de efectos sísmicos locales en la ciudad de Lorca.

et al. 2013

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ResumenEste estudio está enfocado a la caracterización de efectos sísmicos locales en la ciudad de Lorca y corresponde a uno de los aspectos de interés de una campaña de intervención post-sísmica organizada por Institut Geològic de Catalunya (IGC), la Universitat Politécnica de Catalunya (UPC), la Asociación Española de Ingeniería Sísmica (AEIS) conjuntamente con las asociaciones de ingeniería sísmica francesa (AFPS) y portuguesa (SPES) con el objetivo de calibrar, verificar y validar las metodologías de evaluación del riesgo sísmico que estos organismos utilizan. Se presenta el trabajo realizado y los resultados obtenidos para caracterizar la capa de suelos blandos aplicando dos técnicas basadas en medidas de ruido sísmico ambiental: la técnica del cociente espectral H/V y la técnica de "array". El registro de réplicas en distintos emplazamientos ha permitido obtener la respuesta sísmica de estos sitios. A partir de la información obtenida en los trabajos geofísicos de campo se han definido columnas de suelo representativas, se ha podido clasificar el tipo de suelo según el Eurocódigo 8, se ha modelizado su respuesta sísmica y se ha estimado el incremento de intensidad macrosísmica debido a la presencia de suelos blandos. Palabras clave: Efectos locales, ruido sísmico, Vs30, EC8, Simulación numérica, Sismo de Lorca. Site effects characterization in Lorca city AbstractThis study is focused on the characterization of seismic local effects in Lorca city. This aspect fits to one of the interesting points of a field survey for a post-seismic inspection organized by Institut Geològic of Catalonia (IGC), the Universitat Politècnica of Catalonia (UPC), the Spanish Association of Seismic Engineering (AEIS) together with the Earthquake Engineering Associations of France (AFPS) and Portugal (SPES) with the aim to calibrate, check and validate methodologies for seismic risk assessment that these organisms use. We present the work done and the obtained results in order to characterize the soil layers applying two passive seismic techniques: the H/V spectral ratio and the array method. The record of aftershocks in different emplacements has allowed us to obtain the soil seismic response of these sites. The information obtained from the geophysical field survey allowed the definition of representative soil columns and the soil classification according the Eurocode 8. Subsequently, the soil seismic response has been modelled and the increase of macroseismic intensity due to the presence of soft soils has been assessed.

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Local site effect microzonation of Lorca town (SE Spain)

Cited by 45 publications

References 35 publications

Shear‐wave velocity based seismic microzonation of Lorca city (SE Spain) from MASW analysis

Shear‐wave velocity based seismic microzonation of Lorca city (SE Spain) from MASW analysis

Comportamiento de los edificios de HA con tabiquería durante el sismo de Lorca de 2011: aplicación del método FAST

Caracterización de efectos sísmicos locales en la ciudad de Lorca.

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