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2001 Bhuj, India, Earthquake Engineering Seismoscope Recordings and Eastern North America Ground-Motion Attenuation Relations

U.S. Geological Survey
3876 Central Ave., Suite 2
Memphis, Tennessee 38152-3050
cramer{at}ceri.memphis.edu
(C.H.C.)

Department of Earthquake Engineering
India Institute of Technology
Roorkee, India
akmeqfeq{at}iitr.ernet.in
(A.K.)

Engineering seismoscope data collected at distances less than 300 km for the M 7.7 Bhuj, India, mainshock are compatible with ground-motion attenuation in eastern North America (ENA). The mainshock ground-motion data have been corrected to a common geological site condition using the factors of Joyner and Boore (2000) and a classification scheme of Quaternary or Tertiary sediments or rock. We then compare these data to ENA ground-motion attenuation relations. Despite uncertainties in recording method, geological site corrections, common tectonic setting, and the amount of regional seismic attenuation, the corrected Bhuj dataset agrees with the collective predictions by ENA ground-motion attenuation relations within a factor of 2. This level of agreement is within the dataset uncertainties and the normal variance for recorded earthquake ground motions.

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