Profiling of late Tertiary-early Quaternary surface in the lower reaches of Narmada valley using microtremors

Sukumaran, Prabhin and Parvez, Imtiyaz A and Sant, Dhananjay A and Rangarajan, Govindan and Krishnan, K (2011) Profiling of late Tertiary-early Quaternary surface in the lower reaches of Narmada valley using microtremors. In: Journal of Asian Earth Sciences, 41 (3). pp. 325-334.

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Abstract

In this paper, we propose the first approximation for thickness of Quaternary sediment and late Quaternary early Tertiary topography for the part of lower reaches of Narmada valley in a systematic way using the shallow seismic method, that records both horizontal and vertical components of the microtremor (ambient noise) caused by natural processes. The measurements of microtremors were carried out at 31 sites spaced at a grid interval of 5 km s using Lennartz seismometer (5 s period) and City shark-II data acquisition system. The signals recorded were analysed for horizontal to the vertical (H/V) spectral ratio using GEOPSY software. For the present study, we concentrate on frequency range between 0.2 Hz and 10 Hz. The thickness of unconsolidated sediments at various sites is calculated based on non-linear regression equations proposed by Ibs-von Seht and Wohlenberg (1999) and Parolai et al. (2002). The estimated thickness is used to plot digital elevation model and cross profiles correlating with geomorphology and geology of the study area. (C) 2011 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	Journal of Asian Earth Sciences
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Lower reaches of Narmada valley;Microtremor;Palaeo-topography;Ambient noise;H/V spectral ratio;Early Quaternary;Late Tertiary
Department/Centre:	Division of Physical & Mathematical Sciences > Mathematics
Date Deposited:	22 Jun 2011 09:10
Last Modified:	22 Jun 2011 09:10
URI:	http://eprints.iisc.ac.in/id/eprint/38414

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