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Hough, S.E., and S.
Martin, “Intensity Distribution of the January 26, 2001 Bhuj,
India Earthquake", Seismological Research Letters,
72, 3, 2001. |
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Abstract:
TITLEhough instrumental recordings of the devastating January 26, 2001 Bhuj earthquake are unfortunately sparse, the distribution of the
macroseismic effects can provide important constraints on the ground
motions produced by the mainshock. We have complied available news
accounts describing damage and other effects and interpreted them to
obtain modified Mercalli intensities at nearly 200 locations
throughout the Indian subcontinent. These values are then used to
map intensity distribution using a simple
mathematical interpolation |
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method.
TITLEhough preliminary, the maps reveal several interesting features.
Within the Kachchh region, the most heavily damaged
villages are concentrated towards the western edge of the inferred
fault, perhaps implying a substantial westward directivity.
Significant sediment-induced liquefaction is also suggested at a
number of locations around the Gulf of Kachchh to the south of the
epicentre. Away from the Kachchh region intensities were clearly
amplified significantly in areas that are along rivers, within
deltas, or in coastal alluvium. One example is the Narmada River
Valley in the province of Madhya Pradesh, where MMI values of upto
VI were reached at distances
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of over 600 kms. In contrast, the
event was felt only lightly at the higher elevation cities on Deccan
lavas throughout central and southern India. We are hopeful that
available strong motion recordings and other information will
eventually be adequate to calibrate the MMI values relative to
quantitative ground motion parameters, and therefore to determine an
attenuation relation. These results will provide an important new
calibration for intensity data from historic earthquakes in India
and other intercratonic regions. |
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