Recorded Ground Motion and Estimated Soil Amplification for the 11 May 2011 Lorca Earthquake

Belvaux, Myriam; Macau, Albert; Figueras, Sara; Goula, Xavier; Susagna, Teresa

doi:10.1193/122212eqs354m

Cited by 5 publications

(4 citation statements)

References 29 publications

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“…1 and No. 2 were located along the same Alhama de Murcia Fault zone and both earthquakes had a similar focal mechanism [6]. Additionally, it is possible to observe in Figure 2 that the epicenters of both earthquakes No.1 and No.2 are located to a short distance among them.…”

Section: Comparative Analysis Of the Seismic Records Due To The Three...mentioning

confidence: 80%

“…As was mentioned previously, the unique building that collapsed during the earthquake of magnitude 5. the foreshock [23]. Fortunately, for this reason, the building was without persons during the earthquake of magnitude 5.1 [6,23]. This specific case is a reference to infer that parapets in buildings suffered also some grade of damage during the earthquake of magnitude 4.5, but the earthquake of magnitude 5.1 was the event that generated the collapse of the parapets that caused the death of persons.…”

Section: Seismic Actions In Buildingsmentioning

confidence: 92%

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Analysis of the Key Features of the Seismic Actions Due to the three Main Earthquakes of 11th of May 2011 in Lorca, Spain

Meléndez

Puente

Velasco

et al. 2019

CyS

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The seismic records are in general valuable information, especially in cases where damage in buildings has occurred. The main purpose of the present document is to describe the principal results of the analysis of features of ground motions due to the main three earthquakes that occurred in Spain on May 11, 2011. In this day the major earthquake had a magnitude of 5.1 Mw. This event triggered different levels of damage in numerous buildings in the city of Lorca located in southern Spain. Unfortunately, 9 persons died due mainly to the collapse of non-structural elements.We describe in the present paper the application of the software Seismograms Analyzer-e (SA-e) to perform the processing and the analysis of the seismic records obtained in five stations during the main three earthquakes on May 11 (the largest earthquake of magnitude 5.1 Mw, the precursor of magnitude 4.5 Mw, and the aftershock of magnitude 3.9 Mw). We also highlight the significant similitudes between the seismograms generated in the LOR station during these three earthquakes. Additionally, we determined the

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Section: Comparative Analysis Of the Seismic Records Due To The Three...mentioning

confidence: 80%

Section: Seismic Actions In Buildingsmentioning

confidence: 92%

Analysis of the Key Features of the Seismic Actions Due to the three Main Earthquakes of 11th of May 2011 in Lorca, Spain

Meléndez

Puente

Velasco

et al. 2019

CyS

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“…This code is based on the simulation of the surface-wave field (Rayleigh and Love) in plane-parallel multi-layered structures, according to the theory described by Aki [36] and BenMenahem and Singh [37]. Details of the H/V modelling technique code implemented in Grilla and its validation are published in [38,39].…”

Section: Pre-existing Available Data and New Hvsr Measurementsmentioning

confidence: 99%

Preliminary seismic microzonation in a mountainmunicipality of Tuscany (Italy)

Matassoni¹,

Fiaschi²,

Silengo

et al. 2015

Open Geosciences

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Abstract:In this paper we describe a microzonation survey carried out at a mountain Municipality (Piteglio, Northern Apennines). We complemented the available data by conducting 106 microtremor measurements for Horizontal-toVertical Spectral Ratio (HVSR) analysis. Most of the data concern the three major rural villages (Piteglio-Prataccio, Popiglio and Prunetta). Furthermore, we installed a field mobile seismic station at two of the major villages, in order to obtain earthquakes recordings. The HVSR analysis shows amplification effects due to eluvial or colluvial deposits overlying the seismic bedrock, even for areas previously mapped as bedrock outcrops. Most zones characterized by sandstone outcrops show peaked HVSR traces. This observation could be also interpreted in terms of a topographic effect. In contrast, areas characterised by chaotic materials (olistostrome) generally exhibit a flat HVSR. Other areas of seismic amplification were identified on alluvial and landslide deposits. Results by HVSR analysis are well correlated with available data from geo-technical and geophysical surveys, thus allowing to invert HVSRs for the physical properties of the subsoil. Subsoil properties can thus be extrapolated also in areas for which only measurements of seismic noise are available. Moreover, noise HVSRs agree well with those from earthquakes recorded at the different selected sites.

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“…El sismo principal (5.1 𝑀 𝑤 ) ocurrió a las 16:47 UTC a una profundidad de 5 km de la superficie, 3km al norte de la ciudad de Lorca (Belvaux et al 2015) Figura 6-2. Movimiento de aceleración de partícula, en la estación LOR.…”

Section: Causas Y Efectos Del Terremotounclassified

Daño sísmico y propiedades modales en estructuras de edificación

Alva¹

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The time required to inspect damaged structures after an earthquake has a direct impact on the social and economic consequences of the event, which can be catastrophic. Developing tools to aid the inspection task is of great interest to reduce the impacts of seismic events and increase the resilience of cities. In this work we study the basis of a methodology for structural damage diagnosis, which contributes to make faster and more objective decisions about the safety and reoccupation of buildings after an earthquake. It is proposed to estimate the damage in buildings from the change in their dynamic properties. This concept is well established, but its use lacks an explicit and practical purpose of damage assessment. In this regard, we explore new remote sensing techniques for operational modal analysis. In the first part of this thesis, we study feasibility of estimating modal properties in different building types by means of an innovative remote sensing technique, based on Real Aperture Radar (RAR). To improve the quality of the measurements, novel signal analysis and data fusion techniques are explored. The results are contrasted with those obtained from conventional in-contact sensing techniques. The second part of the thesis focuses on the evaluation of structural damage and its relationship with the modal properties of the structure. Specifically, the increase of the fundamental period induced by stiffness degradation due to structural damage, is investigated. Finally, the main advantages and disadvantages of the different measurement techniques are discussed, as well as the increase of the structural period as a damage indicator. A relevant conclusion is that RAR technology can become a very useful tool after an earthquake. This technique allows the identification of modal parameters, not only of tall and flexible structures, but also of low- to medium-rise buildings, without the need to access the structure. Therefore, the time and cost of evaluations can be reduced, in addition to removing the risk of entering a damaged structure. It is worth mentioning that these tools would not only be useful in the post-earthquake emergency phase, where speed of assessment is critical, but also in the subsequent stages of damage assessment and for other purposes, such as structural health monitoring and numerical model calibration. En la gestión de una emergencia post-sísmica el tiempo requerido para inspeccionar las estructuras dañadas tiene una repercusión directa en las consecuencias sociales y económicas del sismo, las cuales pueden llegar a ser catastróficas. Desarrollar herramientas que faciliten la tarea de inspección resulta de gran interés para reducir los impactos de los eventos sísmicos e incrementar la resiliencia de las ciudades. En este trabajo se estudian las bases de una metodología de diagnóstico de daño estructural, la cual contribuya a tomar decisiones más rápidas y objetivas sobre la seguridad y reocupación de las edificaciones después de un sismo. Se propone estimar el daño en las edificaciones a partir del cambio en las propiedades dinámicas de las mismas. Este concepto está bien establecido, pero su uso carece de un propósito explícito y práctico de evaluación del daño. En este sentido, se hace uso del análisis modal operacional con nuevas técnicas de medición sin contacto. En la primera parte de esta tesis se estudia la viabilidad de estimar las propiedades modales en distintas tipologías de edificios por medio de una innovadora técnica de teledetección, basada en el Radar de Apertura Real (RAR). Para mejorar la calidad de las mediciones, se exploran técnicas novedosas de análisis de señales y fusión de datos. Los resultados son contrastados con los obtenidos de técnicas convencionales de medición con contacto. La segunda parte se centra en la evaluación de daño estructural y su relación con las propiedades modales de la estructura. Específicamente, se investiga el incremento del periodo fundamental en un edificio de tipología común en España, inducido por la degradación de rigidez debida al daño estructural. Finalmente se discuten las principales ventajas y limitaciones de las distintas técnicas de medición, así como del incremento de periodo estructural como indicador de daño. Una conclusión relevante es que la tecnología RAR puede llegar a ser una herramienta de gran utilidad después de un terremoto. Esta técnica permite la identificación de parámetros modales, no solo de estructuras altas y flexibles, sino también de edificaciones más rígidas de mediana altura, sin la necesidad de acceder a la estructura. Por lo tanto, se puede reducir el tiempo y costo de las evaluaciones, además de eliminar el riesgo que representa entrar en una estructura dañada. Cabe mencionar que estas herramientas no solo serían útiles en la fase de emergencia post-sismo, donde la rapidez de la evaluación es fundamental, sino también en las etapas siguientes de evaluación de daño y con otros propósitos, tales como el monitoreo de la salud estructural y la calibración de modelos numéricos.

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Recorded Ground Motion and Estimated Soil Amplification for the 11 May 2011 Lorca Earthquake

Cited by 5 publications

References 29 publications

Analysis of the Key Features of the Seismic Actions Due to the three Main Earthquakes of 11th of May 2011 in Lorca, Spain

Analysis of the Key Features of the Seismic Actions Due to the three Main Earthquakes of 11th of May 2011 in Lorca, Spain

Preliminary seismic microzonation in a mountainmunicipality of Tuscany (Italy)

Daño sísmico y propiedades modales en estructuras de edificación

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