Ambient noise H/V spectral ratio in site effects estimation in Fateh jang area, Pakistan

Qadri, S. M. Talha; Nawaz, Bushra; Sajjad, S. H.; Sheikh, Riaz Ahmad

doi:10.1007/s11589-014-0105-9

Cited by 19 publications

(11 citation statements)

References 21 publications

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“…The signal's duration must meet these conditions: the number of windows multiplied by the window width. For instance, if the anticipated microtremor frequency is 2 Hz, the minimum recording time advised is 5 minutes [29]. Using an anti-triggering logarithm, the Short Term Average (STA) and Long Term Average (LTA) can be compared to determine the window automatically.…”

Section: Microtremor Methodsmentioning

confidence: 99%

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Subsurface Analysis Using Microtremor and Resistivity to Determine Soil Vulnerability and Discovery of New Local Fault

Susilo,

Juwono,

Aprilia

et al. 2023

Civ Eng J

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Microtremor and geoelectrical resistivity surveys have been conducted in areas where the April 10, 2021, earthquake of 6.1 Mw caused the most damage. Wirotaman Village, Malang Regency, was one of the regions with the most extensive damage. This study aims to investigate the seismic vulnerability and subsurface conditions that result in severe damage at the research location. This study's Horizontal to Vertical Spectral Ratio Analysis (HVSR) curve was derived from the recorded microtremor signal in the frequency domain. The frequency parameter and amplification factor obtained from the curve are used to determine the seismic vulnerability index. In addition, a geoelectrical resistivity study with a dipole-dipole configuration was conducted at the site with the most extensive damage. The results of this study show the correlation between the results of the HVSR curve analysis and geoelectrical resistivity in determining the seismic vulnerability of an area. The results indicated that the high seismic vulnerability index value ranged from Kg= 12.0 to 18.0, with the most severe damage concentrated in the Southwest at SA 05 and SA 06. Based on the results of the geoelectrical survey, information was obtained that several points of damage to buildings at SA 05 (red circle) were on the same line, where this condition was associated with the possibility of new faults at that location. This microtremor and geoelectric resistivity investigation reveals thick sedimentary deposits with a high seismic vulnerability index and low resistivity. This study's findings can be utilized as a guide for micro zonation studies in research areas. This research contributes to the surrounding community in the form of disaster mitigation, where construction must avoid local fault positions that have been found to reduce the level of damage when natural geological disasters occur. Doi: 10.28991/CEJ-2023-09-09-014 Full Text: PDF

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Section: Microtremor Methodsmentioning

confidence: 99%

“…In this analysis, the STA is 1.00 seconds, whereas the LTA is 30.00 seconds. The signal is considered a microtremor if the STA/LTA ratio exceeds the required threshold, defined as 0.20 s minimum and 2.50 s maximum [29].…”

Section: Microtremor Methodsmentioning

confidence: 99%

Subsurface Analysis Using Microtremor and Resistivity to Determine Soil Vulnerability and Discovery of New Local Fault

Susilo,

Juwono,

Aprilia

et al. 2023

Civ Eng J

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“…Nogoshi & Igarashi (1970, 1971 are among the first to implement the horizontal to vertical spectral ratio (HVSR) to microtremor measurements, however the practice of this technique has faced many condemnation due to the uncertainty about microtremor sources. Many researchers (Ansary & Arefin, 2020;Qadri et al, 2015aQadri et al, , 2017Raymond, 2017;Singh et al, 2017) have paid a renewed interest for estimating dynamic properties of soils and structures using microtremor, since lucid and dependable information can be obtained by very easy and less costly noise measurements.…”

Section: Microtremor Survey Methodsmentioning

confidence: 99%

“…The HVSR method is effective to estimate site response by removing source effects by dividing the horizontal component of ambient noise by the vertical component. This method has been applied by many researchers in many countries such as Mexico, Turkey, India, Pakistan, USA and Japan, to determine fundamental frequency, amplification and depth of basin (Qadri et al, 2015a(Qadri et al, , b, 2017(Qadri et al, , 2018Rehman et al, 2016;Raymond, 2017;Singh et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Assessment of seismic vulnerability index of RAJUK area in Bangladesh using microtremor observations

Helaly¹,

Ansary²

2021

S&R

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Microtremor Horizontal to Vertical spectral ratio technique, also known as the Nakamura’s method is growing in status for site response analysis. 500 locations in RAJUK area (1530 km2) have been selected for microtremor observations. Microtremor data have been compiled and studied to estimate the predominant resonance frequency and H/V peak amplitude following the SESAME (2004) guideline. Finally, seismic vulnerability index of site soil using Nakamura’s technique has been determined from predominant resonance frequency and H/V peak amplitude parameter. The calculated seismic vulnerability index for the studied 500 locations varies between 0.16 and 7.28. The low seismic vulnerability index (Kg) value means that the areas are relatively stiff and underlain by substantial deposit of sediments. The relatively higher Kg values are spread in the soft alluvial deposit areas. The areas with high Kg values are considered as fragile zones that may initiate significant damage to infrastructure situated in those areas during an earthquake.

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“…For single station seismic observation data, the horizontal to vertical (H/V) spectral ratio (HVSR) method (Nakamura, 1989) is an effective seismological analysis method. The HVSR method is widely applied on Earth to ambient noise data (Cara et al., 2003; Pilz et al., 2010), microtremors (Pamuk et al., 2018; Teves‐Costa et al., 1996) and site effect studies (Chen & Wang, 2019; Pilz et al., 2009; Talha Qadri et al., 2015), and was also applied to Apollo seismic data to estimate the shallow structure at the Apollo station site (Dal Moro, 2015; Horvath et al., 1980; Nakamura et al., 1975). Since there is no ocean on Mars and the Martian atmosphere is relatively active, the ambient noise on Mars is mainly affected by local environmental effects, especially the wind, as observed by the Viking 2 seismometer (Anderson et al., 1977; Lognonné & Mosser, 1993).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Horizontal to Vertical Spectral Ratio of InSight Seismic Data From Mars

Wang

2022

JGR Planets

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Since February 2019, the InSight mission has returned seismic and meteorological data from Mars. We conducted horizontal to vertical spectral ratio (HVSR) analysis to the InSight seismic data recorded both on the lander and on the ground. Horizontal to vertical spectral ratio curves of ground data show multi‐peak characteristics at frequencies between 1 and 30 Hz with the highest peak appearing at around 11.7 Hz. The HVSR results of the Very Broad Band (VBB) and Short Period (SP) data differ greatly for frequencies over 10 Hz due to the difference in vertical component. The onboard SP data have the same highest H/V peak as the ground SP data. We conducted numerical modeling of HVSR and confirmed that the wind‐induced lander vibrations are the major sources to the InSight seismic ground motion in high frequencies. The HVSR curves of the continuous ground SEIS data show diurnal variation and are highly correlated with local meteorological conditions. The particle motions are investigated through the polarization analysis and the random decrement method. Generally, the ground motions above the self‐noise level are linearly polarized in the horizontal plane around the highest H/V peak. The damping analysis demonstrated the mechanical origins of the highest HVSR peak, while the 2.4 Hz mode is the most likely one having natural origin. Finally, most marsquake signals analyzed in this study generally highlight the 2.4 Hz trough but cause no significant change on the shape of the H/V curves. Our study explores the possible existence of natural sources in relatively high frequencies of Mars' background noise.

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Ambient noise H/V spectral ratio in site effects estimation in Fateh jang area, Pakistan

Cited by 19 publications

References 21 publications

Subsurface Analysis Using Microtremor and Resistivity to Determine Soil Vulnerability and Discovery of New Local Fault

Subsurface Analysis Using Microtremor and Resistivity to Determine Soil Vulnerability and Discovery of New Local Fault

Assessment of seismic vulnerability index of RAJUK area in Bangladesh using microtremor observations

Characteristics of Horizontal to Vertical Spectral Ratio of InSight Seismic Data From Mars

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