- Ground-motion model is:
_{m}is g, a_{1}= -1.49, a_{2}= 0.31, a_{3}= 0.0248, h = 9.4km and σ = 0.32 (for horizontal components) and a_{1}= -1.92, a_{2}= 0.29, a_{3}= 0.0146, h = 6.7km and σ = 0.36 (for vertical components). - Data from experimental strong-motion array consisting of 12 Kinemetrics PDR-1 instruments deployed in
the epicentral area of the M
_{s}= 7.8 Tangshan earthquake of 28th July 1976. Provide details of site geology at each station; most stations are on soil. - Records from earthquakes recorded by only one station were excluded from analysis.
- Note that equations are preliminary and more refined equations await further studies of magnitudes and distances used in analysis.
- Note that high anelastic attenuation coefficient may be due to biases introduced by the distribution in magnitude-distance space and also because of errors in magnitude and distances used.