Extracting the shear wave velocity structure of deep alluviums of “Qom” Basin (Iran) employing HVSR inversion of microtremor recordings

Maghami, Shahram; Sohrabi-Bidar, Abdollah; Bignardi, Samuel; Zarean, A.; Kamalian, Mohsen

doi:10.1016/j.jappgeo.2020.104246

Cited by 19 publications

(8 citation statements)

References 33 publications

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“…The use of HVSR analysis of ambient noises has been widely considered to study topographic effects in recent decades (De Guevara et al 2022;Köhler et al 2012;Maghami et al 2021;Panzera et al 2011;Theodulidis and Bard 1995;Ulysse et al 2021).…”

Section: Microtremor Surveymentioning

confidence: 99%

The evaluation of the adjacency effect on the seismic response of homogenous hills

et al. 2023

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A brief review of previous studies shows that topographic features play an important role in the amplification (de-amplification) of seismic waves. Most researchers who have focused on topographic effects have paid attention to the distribution of amplification on isolated features, whereas what is seen in nature is often more complicated. It is known that 2D or 3D geological structures further contribute to the amplification of seismic ground motion. The main objective of this study is an investigation of the influence of adjacent hills on seismic responses. First, a parametric study has been performed, considering five models (consisting of one to five 2D symmetric homogeneous semi-sinusoidal hills), which are subjected to vertical incident waves. The 2D numerical results show that the largest values of spectral amplification for a series of 2D semi-sinusoidal hills are observed at the crest stations of the central hill, and it increases when the number of hills increases symmetrically on both sides of the central hill. This means that the spectral amplification increases from 3.3 for single-hill model to 4.37 for five-hill model. In the following, to validate the parametric results, three adjacent hills located in the city of Arak are studied using the horizontal-to-vertical spectral ratio analysis of microtremor recordings. The comparison with the amplification results obtained from the distinct element (UDEC) and boundary element (HYBRID) numerical approaches indicates that the central hill is more affected by adjacency, rather than the side hills. The spectral amplification for the crest station on the central hill is higher than the two other stations.

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Section: Microtremor Surveymentioning

confidence: 99%

The evaluation of the adjacency effect on the seismic response of homogenous hills

et al. 2023

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“…On the other hand, it is imperative to generate the bedrock depth information to obtain a complete ground structure model in basin-type structures and to model information such as possible soil amplification and acceleration distribution. For this purpose, many studies have been carried out to obtain bedrock depth with experimental relations from inversion based on ambient vibration measurements (Delgado et al, 2000a;Hinzen et al, 2004;García-Jerez et al, 2006;D'Amico et al, 2008;Birgören et al, 2009;Özalaybey et al, 2011;Harutoonian et al, 2013;Fairchild et al, 2013;Del Monaco et al, 2013;Mendecki et al, 2014;Kuo et al, 2016;Sant et al, 2017;Molnar et al, 2018;Liang et al, 2018;Moon et al, 2019;Thabet, 2019;Anbazhagan et al, 2019;Rupar and Gosar, 2020;Büyüksaraç et al, 2021;Maghami et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Bedrock Depth Calculation of Çanakkale (Turkey) Basin Using Rayleigh Ellipticity and Microgravity Survey

et al. 2023

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Es un hecho bien conocido que el efecto suelo local juega un papel importante en el daño a las estructuras durante los terremotos. Para definir correctamente la interacción suelo-estructura, se debe conocer bien la geometría de las capas de suelo compactas y sueltas en el suelo. Además, el contraste de impedancia debido a los efectos locales del suelo puede ser más profundo que los primeros 30 m, que se acepta como la profundidad de ingeniería, y en este caso, el parámetro Vs,30 está deshabilitado. Por esta razón, la ubicación del lecho rocoso de ingeniería y el lecho rocoso sísmico cobra importancia. La variación de la velocidad de la onda de corte con la profundidad es un parámetro clave para la estimación del efecto de campo sísmico. Además, la separación de capas de baja densidad cercanas a la superficie y lecho rocoso de mayor densidad se puede realizar fácilmente mediante el método de gravedad. Los niveles de lecho rocoso/cimentación sísmica se determinaron usando estos dos métodos juntos para los suelos de Çanakkale, que se sabe que tienen problemas de licuefacción y espesor aluvial grueso. Se realizaron medidas de microgravedad en 100 puntos y las anomalías obtenidas se modelaron en tres dimensiones. A la luz de los datos obtenidos de este estudio, se ha determinado que el espesor de la unidad de cuenca suelta en el área de estudio está en el rango de aproximadamente 50-300 m. La vibración ambiental se registró con la ayuda de un sismómetro de velocidad en 146 puntos, y los perfiles de velocidad S (Vs) se obtuvieron utilizando la inversión de la curva de elipticidad observada. Además, la estructura de tasa de cambio de profundidad de velocidad de la cuenca se define en función de las velocidades Vs en el modelo de gravedad 2D realizado a lo largo de los dos perfiles que cortan la cuenca en las direcciones N-S y E-W. A lo largo de estos perfiles, el rango de frecuencia se ha determinado de 0,8 a 1,3 Hz en las partes profundas de la Cuenca y de 1,5 a 11,0 Hz en las partes poco profundas.

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“…The HVSR method was introduced by Nogoshi and Igarashi (1971) and later developed by Nakamura (1989). Since its introduction, the application of the HVSR method has increased in research worldwide (Ahn et al, 2021;Maghami et al, 2021;Zavala et al, 2021). The HVSR method has the advantage that it does not contain source effects (noise) on the power spectrum density and does not depend on the availability of adjacent hard rock sites (Kumar et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Frequency and Amplification for Assessing site Effects and PVS in the Padang City Railway

Pohan M.Si,

Pujiastuti,

Syarah

et al. 2023

J. Ilmu Fis.

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The train uses a special line in the form of railroad tracks that produce vibrations during movement. This study aims to determine the type of soil layer and the peak particle velocity due to the train around the Padang City train line. The acquisition was carried out at 8 points with a recording duration of 65 minutes using three geophone components. Microtremor data was analyzed using horizontal to vertical spectral ratio (HVSR) method. The results show that the research area has a type of surface layer of soil is sediment with a thickness of 30 meters or more. This is indicated by the dominant frequency value ranging from 0.64 Hz – 1.67 Hz. The research area has an amplification value ranging from 0.85 to 1.29. The train vibration has a dominant frequency ranging from 2.20 Hz – 13.54 Hz and an amplification of 1.11 – 1.82. The particle velocity values obtained from the PVS values ranged from 0.1605 mm/s – 0.7592 mm/s. The research area can be categorized as safe from train vibrations because of the low amplification value and the PVS value which is below the safe limit (<3 mm/s) according to SNI 7571:2010.

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Extracting the shear wave velocity structure of deep alluviums of “Qom” Basin (Iran) employing HVSR inversion of microtremor recordings

Cited by 19 publications

References 33 publications

The evaluation of the adjacency effect on the seismic response of homogenous hills

The evaluation of the adjacency effect on the seismic response of homogenous hills

Bedrock Depth Calculation of Çanakkale (Turkey) Basin Using Rayleigh Ellipticity and Microgravity Survey

Frequency and Amplification for Assessing site Effects and PVS in the Padang City Railway

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