Prediction Of Response Spectral Parameters For
Bhuj Earthquake (26th January 2001) Using A
Component Attenuation Modelling Technique
Author(s)
S. H. Lodi & M. Kumar
Abstract
The Mw 7.7, Bhuj earthquake that occurred in the north-western fringes of the
Indian subcontinent is regarded as one of the most devastating earthquakes of the
stable continental regions (SCR). Although the Kutch region has experienced the
events of large and moderate magnitude since historic times, yet the estimation
of future design basis have remained hampered by lack of ground motion data.
A recently developed methodology of Component Attenuation Modelling
(CAM) is adopted to estimate the response spectral values. The technique is a
modified version of the orthodox stochastically based simulation model, and
predicts design structural responses directly by adapting local seismological
information, for the regions lacking earthquake records. A dataset of
13 Structural Response Recorders (SRRs) stationed at various location from the
epicentre is utilized for purpose of validation, due to absence of Digital
Strong-Motion Accelerograph (DSA) records. The stations are categorized in
three schemes: Quaternary, Tertiary and Rock; based on NEHRP classification.
The wave propagation behaviour of the crust is assumed to resemble with
Coastal Region of South China (CRSC), considering the geological setting and
wave transmission qualities of both regions. The observed recordings reconcile
well with predictions of CAM in the bandwidth of available time periods on the
rock sites. The absence of recordings in displacement and acceleration controlled
regimes restricts to assess the performance of the technique in all period ranges.
The exercise not only helps achieve the design parameters for the subject region,
but also assesses the applicability of CAM to the regions of low to moderate
seismicity.
Keywords: component attenuation modeling, Bhuj, stochastic simulation,
structural response recorders, stable continental regions, design response
spectra.
Keywords
component attenuation modeling, Bhuj, stochastic simulation,
structural response recorders, stable continental regions, design response
spectra.
Related Book
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