Ebrahim Haghshenas's research while affiliated with International Institute of Earthquake Engineering and Seismology and other places

Publications (25)

Article
The aim is to identify and assessment of the shear strength parameters (φ and c) of the geological formation in the Roudbar quadrangle at a regional scale, to be used in seismic landslide hazard or susceptibility zonation. In this study, the earthquake-induced landslide inventory map following Roudbar-Manjil Earthquake was prepared. The geotechnica...
Article
Full-text available
The assessment of the strength parameters of geological formations in regional scale which encounters thousands of slopes is a complicated approach and time consuming and needs huge field work. This issue is an important research topic concerning the regional seismic-landslide susceptibility analysis or hazard zonation. An empirical regression mode...
Article
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Article
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Despite extensive studies on the microtremor processing technics and horizontal to vertical (H/V) spectral ratio analysis, limited studies have been tried to interpret the observations and experimental results and confirming them via two and three- Dimensional numerical modeling. The present article deals with this issue by selecting the Urmia allu...
Article
Seismic ambient noise is nowadays widely used in geophysics to characterize the subsoil structure. They are convenient, practical, and low-cost tool to provide reliable information about the underground structure especially in urbanized area. In this paper, seismic ambient noise measurements are used to study the subsoil properties at a site in the...
Article
Full-text available
The impacts of Iran’s recent and destructive earthquake of Mw 7.3 November 12 2017, and its important subsequent events are investigated at Sarpol-e-zahab by means of 1D-equivalent linear site response analyses. Local damages at Sarpol-e-zahab highlighted the role of seismic microzonation in seismic risk reduction and damage prevention plans for fu...
Article
Full-text available
This study is intended to investigate ambient noise recordings in form of array and single-station measurements at Sarpol-e-zahab city after the destructive Mw = 7.3 earthquake of 12 November 2017 in Kermanshah province, Iran. The ESPAC, f-k, HVTFA, and HVSR methods are applied to analyze the ambient noise and obtain useful information on three key...
Conference Paper
Full-text available
On 12 Nov. 2017 an earthquake of Mw=7.3 struck Kermanshah province, Iran. The epi-center center was located at Lat. 34.77 and Long. 45.76, by the Iranian Seismological Cen-ter with focal depth of 18 km. The event was assigned to Mountain Front Fault (MFF) ac-tivity due to its focal mechanism. Sarpol-e-zahab was the most affected city by the earth-q...
Article
Full-text available
The destructive earthquake of Sarpol-e Zahab (Mw=7.3, Depth=18 Km) lead to sever damages to many of structures of the affected region. The first reconnaissance of the area showed that the structures damage distribution could be interpreted by the effect of local site conditions. Therefore, some microtremor measurements and geophysical surveys were...
Article
Full-text available
Based on inversion of the horizontal-to-vertical spectral ratio of microtremors (H/V), the empirical H/V spectrum of surface waves propagating on a layered half-space was studied and the effects of soil layers on fundamental and higher peak frequencies were considered. Using the Nakamura H/V spectral method and comparing it with the analytical site...
Article
Full-text available
Horizontal to vertical spectral ratio technique on single station ambient noise data, is a well-known technique in study of site effect. Recently, this technique is introduced as a tool for identification of shear wave velocity profile of soil beside its normal usage. Many studies in recent years showed that the ellipticity of the fundamental mode...
Conference Paper
Full-text available
Research studies done in the last decade show that using ellipticity of Rayleigh waves is one of the best ways to extract shear wave velocity profile in a thick alluvial deposit, the Determination of the underground structure and detection of the engineering or geologic bedrock. The frequency- time analysis and random decrement method are two of th...
Article
In order to assess and compare efficiency of triangular and orthogonal arrays in identification of subsurface structure specifications up to a depth of 50 meters using microtremor waves by F-K method, two triangular and orthogonal arrays with 13 and 12 stations (which included some sub-arrays), respectively, were studied in a site located in north...
Article
Full-text available
In this paper we are going to show the importance of mode identification in microtremor array analysis. The idea come from four concentric ambient noise array recordings with aperture 100 to 1000 meters, performed in southern urban area of Tehran near the shrine of Imam Khomeini. These measurements were part of a comprehensive research project with...
Conference Paper
Full-text available
According to studies which were performed in the framework of seismic microzonation of Arak city caused by earthquake swarm’s which were happened in a short period in 1390.10.25 between Arak’s northwest and Ashtian’s southeast , most of spectral ratio calculated for these measurement shown a clear amplification for low frequencies. Observing low fr...
Conference Paper
Full-text available
As microzonatin studies, microtremor measurements were carried out in many cities in Iran and the resonant frequency of each station was estimated from the peak at the spectral ratio between the horizontal and vertical component. For many of these stations the thickness of the sedimentary cover was known by conducting boreholes or geophysical inves...
Article
Full-text available
Site effects associated with local geological conditions constitute an important part of any seismic hazard assessment. Many examples of catastrophic consequences of earthquakes have demonstrated the importance of reliable analyses procedures and techniques in earthquake hazard assessment and in earthquake risk mitigation strategies. Ambient vibrat...
Article
Full-text available
Site amplification in the Khorasan Seismic Network, Iran, was estimated using small earthquake events (ML 1.6-5.5) recorded from 2003 to 2006. This seismic network consists of 5 broad band stations (NJ, MH, BJ, QU and SB) distributed in Razavi and North Khorasan provinces. A total of 255 three-component waveforms from 88 events were used in this st...
Article
President: M. Campillo; Membres de jury: M. Boulon, B. Gatmiri. M. Cara, D. Hatzfeld

Citations

... UAN has been applied in many applications, such as in obtaining microzonation maps (Ashayeri et al., 2020), soil mapping (Wathelet et al., 2020) or monitoring traffic noise (Zambon et al., 2018), economic growth (Hong et al., 2020), or cultural events (Kil et al., 2021), global climate imprints (Stutzmann et al., 2009), engineering geology (Iannucci et al., 2018) geohazards such as landslides (Hussain et al., 2019), volcanos (De Plaen et al., 2019) and hydrology (Tribaldos and Ajo-Franklin, 2021). All applications of ambient noise require its stability over time. ...
... Tectonically, Kermanshah is located on an active seismic zone of Zagros thrust-fold belt generated due to collisions of Eurasian and Arabian plates, extended north-west to south-east along the borderline between Iran and Iraq as well as Turkey. The region had several major historic earthquakes, but the most recent one occurred on November 12, 2017, Mw 7.3 that has led to questions of seismic performance of engineering structures and masonry buildings in perspectives of local site effects [22,23]. Probabilistic Seismic Hazard Assessment (PSHA) and Seismic Microzonation (SM) were performed for Kermanshah city and Kangavar (the other major municipality in Kermanshah province) before Mw 7.3 earthquake event [24,25] along with seismic vulnerability assessment of the masonry buildings of Kermanshah city [26]. ...
... The main objective of the current study is to explore the seismic behavior of different structural buildings and seismological aspects of this event; including Peak Ground Acceleration (PGA), Peak Ground Velocity (PGV), Peak Ground Displacement (PGD), Fourier amplitude spectra, and spectral acceleration. Although the seismic geological properties of Sarpol-e-zahab earthquake were previously well-established (Ashayeri et al. 2019(Ashayeri et al. , 2020Naserieh et al. 2020;Zafarani et al. 2020;Yaghmaei-Sabegh 2019, 2020Mahani & Kazemian 2018;Shakiba et al. 2018;Eshaghi et al. 2019), it was the first time that a study on the Seismological aspects and seismic behavior of buildings due to this earthquake was reported. ...
... Some of the most important of these studies in the world are described in TC4 manual. The microzonation studies of Tehran (Khandan et al. 2011;Jafari et al. 2004), Qom , and Asaluyeh (Davoodi et al. 2019) and Bam (Jafari et al. 2005) also are among the most important works done in Iran. ...
... This method was recommended in ASCE/SEI 7-16 (2017) and by several researchers (Acerra, Havenith, and Zacharopoulos 2004;Albarello and Lunedei 2013;Campbell and Bozorgnia 2007;Haghshenas et al. 2008;NBC 2015b;Picozzi, Parolai, and Albarello 2005;Stewart et al. 2011). Since the correlated horizontal ground motion records have one rotation angle equal to or close to zero, the maximum value may not be a strong function of the component correlation form. ...
... The acquired dispersion and ellipticity curves of surface waves carry information about mechanical properties of the subsurface. Hence, we can jointly invert these data for the S-wave velocity profile (Scherbaum et al. 2003;Wathelet et al. 2004;Arai & Tokimatsu 2005;Wathelet 2008;Poggi et al. 2012;Fazlavi & Haghshenas 2015;Ullah & Prado 2016;Gouveia et al. 2018). In this work, we perform a joint inversion using a newly developed algorithm for the multizonal transdimensional Bayesian inversion (Hallo et al. 2021). ...
... One of the problem, using HVSR on ambient noise data, in Tehran is the lack of microtremor energy on low frequency signal (0.1-1 Hz), because of the distance between Tehran and oceans (the nearest sea to Tehran is Caspian Sea with a distance about 100 Km) as the source of the ambient noises in these range of frequencies [24,25]. In order to overcome this deficiency of energy we also calculate horizontal/vertical spectral ratio using earthquake records. ...
... For example, the HVSR method [2,3] is used to assess the fundamental frequency of soil deposits. Separate studies successfully implemented the HVSR technique in Turkey and Iran to calculate the site predominant frequency enhance the HVSR technique to infer the subsurface shear wave profile [4][5][6]. ...
... El método HVSR o H/V se basa en la interpretación del cociente de los espectros de Fourier de las componentes horizontal y vertical del movimiento del suelo. Inicialmente este método fue usado para determinar la frecuencia de resonancia del suelo y estimar la amplificación máxima, lo que se emplea para caracterizar los efectos de sitio en ingeniería civil [226,189,301,26]. ...
Reference: Tesiss