Shear Wave Velocities in the Estimation of Earthquake Hazard Over Alluvium in Seismically Active Region

Narasimman Sundararajan, T. Seshunarayana

Research output: Contribution to journalArticle

Abstract

It is well known that the potential hazard during an earthquake is mainly in alluvium or alluvium filled basins; shear wave velocity plays a significant role in estimating the possible hazard during an earth quake in such an area. This paper presents shear wave velocity profile from Jabalpur, Central India mainly dominated by alluvial soil that was moderately affected by an earthquake of magnitude 6.5 in May, 1997. The acquired shear wave velocity by Multichannel Analysis of Surface Wave (MASW) in as many as 36 sites over alluvial soil ranges from 200 m/sec to 400 m/sec and in a few sites marginally less than 200 m/sec corresponding to a sub-surface depth of 30–35 m. Further, the computed N values vary as low as near zero to less than 25. The study is substantiated by the estimation of P-wave velocity by refraction seismic method at the same locations of MASW which ranges from 350 m/sec to 2200 m/sec. The results suggest that the damage during an earth quake appears to be highly unlikely in view of the marginally high Vs up to depth of 30 m. This study on seismic hazard is substantiated by the estimation of frequency of the ground as well as amplification which is found to be a maximum of about 2.5 in the frequency band of 2–6 Hz in west and north western portion of the study area.

Original languageEnglish
Pages (from-to)259-264
Number of pages6
JournalJournal of the Geological Society of India
Volume92
Issue number3
DOIs
Publication statusPublished - Sep 1 2018

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seismic hazard
alluvial deposit
wave velocity
S-wave
surface wave
hazard
earthquake
seismic method
velocity profile
refraction
P-wave
amplification
soil
damage
basin
analysis

ASJC Scopus subject areas

  • Geology

Cite this

Shear Wave Velocities in the Estimation of Earthquake Hazard Over Alluvium in Seismically Active Region. / Sundararajan, Narasimman; Seshunarayana, T.

In: Journal of the Geological Society of India, Vol. 92, No. 3, 01.09.2018, p. 259-264.

Research output: Contribution to journalArticle

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