Engineering source model for strong ground motion

Raghu Kanth, S. T. G. ; Iyengar, R. N. (2009) Engineering source model for strong ground motion Soil Dynamics and Earthquake Engineering, 29 (3). pp. 483-503. ISSN 0267-7261

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S02677...

Related URL: http://dx.doi.org/10.1016/j.soildyn.2008.05.010

Abstract

A new engineering source model consistent with seismological concepts for simulating strong-motion accelerograms (SMAs) is presented in this paper. The source region is modeled as a horizontally layered elastic medium to cater for site dependency. The moment field acting on the rupture plane is decomposed into space and time functions, which is a novel concept. The spatial and temporal components are determined for six well-recorded earthquakes using the corresponding recorded SMA. The obtained spatial variations indicate that they can be modeled as an anisotropic random field. The temporal components of all the six events are transients, with typical frequency spectra. Based on these results, a simplified source model is proposed for the synthesis of SMA during strong earthquakes. The model is validated by simulating strong-motion acceleration time histories at stations deliberately kept out of the modeling exercise. It is found that the present model is efficient in simulating observed time histories. The proposed model is also illustrated by simulating an ensemble of acceleration time histories for the Kutch earthquake of 26th January 2001 using only the few known source parameters.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Strong Ground Motion; Acceleration Time Histories; Response Spectra; Kutch Earthquake
ID Code:12735
Deposited On:11 Nov 2010 09:03
Last Modified:03 Jun 2011 08:43

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