Microtremor measurements in the India's holy city, Varanasi for assessment of site characteristics

Shankar, Uma; Kumari, S.; Yadav, Pawan Kumar; Singh, A. P.; Gupta, Arun Kumar

doi:10.1016/j.quaint.2021.01.008

Cited by 9 publications

(3 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Every single data collection station used a seismometer that was level, pointed northward geographically, and installed with the sensor in a 5 to 10-inch-deep hole in the ground to minimize wind noise. The seismometer must be leveled and oriented in order to accurately record each component's N-S, E-W, and vertical components (Shankar et al, 2021).…”

Section: E Seismic Microtremor Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Coal Pick Excavation on Tunnel Stability Constituent Rock Parameters

Nata,

Ren,

Tanjung

et al. 2023

Preprint

View full text Add to dashboard Cite

Underground mining is a mining method in which all mining activities or activities are carried out below the surface of the earth. The purpose of this study is to analyze the quality of rock mass in the tunnel, in terms of the physical, mechanical, and dynamic properties of the rock, as well as observe the influence of coal pick hammer vibration on the stability of the tunnel. and determine supporting recommendations in tunnel 9. The Pundit Test for coal sample with R2 = 0.9023 is obtained. The correlation P-wave with index strength got R2 = 0.8977. For correlation between P-wave and Schmidt Hammer Rebound Number got R2 = 0.9699. Tunnel support recommendation for the AICJ-09 Tunnel with “Q” value of 1.8 and 1.6, it belongs to the poor rock class. Microtremor measurement got the highest vibration value occurred at station 11, where 2 high vibration values were found, namely 0.159 m/s2 and 0.261 m/s2. This happens because the vibration of the coal pick increases because it is influenced by coal transportation activities and there are also additional vibrations originating from the compressor machine working around station 11. Vibration causes a decrease in the value of the tunnel safety factor. The analysis's findings showed that the safety factor's value had decreased. However, the safety factor is still considered safe against tunnels. Where the standard tunnel safety factor of 1 is said to be a stable tunnel.

show abstract

Section: E Seismic Microtremor Methodsmentioning

confidence: 99%

“…The seismometer must be leveled and oriented in order to accurately record each component's N-S, E-W, and vertical components (Shankar et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Effect of Coal Pick Excavation on Tunnel Stability Constituent Rock Parameters

Nata,

Ren,

Tanjung

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Microtremor is a low-amplitude vibration (0.1 micron -1 micron for the amplitude displacement 0.001 cm/s -0.01 cm/s for the amplitude velocity) that comes from natural or man-made phenomena, such as wind, ocean waves, or vibrations from vehicles that can describe geological conditions near the surface (Haerudin et al, 2020;Kafadar, 2020;Nelson, 2019;Susilo & Wiyono, 2012). Microtremor analysis provides information on the dynamic properties of site characteristics such as dominant frequency, amplification, and soil susceptibility (Kafadar, 2020;Nakamura, 1989;Shankar et al, 2021;Yaghmaei-Sabegh & Rupakhety, 2020). One method for analyzing microtremor is the horizontal to vertical spectral ratio (HVSR) method (Kafadar, 2020;Nakamura, 1989;Nelson, 2019;Susilo & Wiyono, 2012).…”

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.

View full text Add to dashboard Cite

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.

show abstract