- Ground-motion model is:
where A is in g, c1 = -1.497±0.3494, c2 = 0.3882±0.1203, c3 = 0.2876,
b = 1.19 and σ = 0.1451.
- Data from National Strong Motion Network (111 analogue SMA-1 records, 7 earthquakes, 5.2 ≤ M ≤ 6.8)
and strong-motion arrays (105 digital GSR-18 records, 17 earthquakes, 4.0 ≤ M ≤ 6.8) from Garhwal and
Kumaon Himalaya from 1986 to 2011. Analogue data bandpass filtered using Ormsby filter with cut-offs
0.17–0.20Hz and 25–27Hz.
- Focal depths from 5 to 122km.
- Most data from rhypo > 100km.
- Regress data from each earthquake individually using function: log A = -blog X + c and find average
b = 1.20. Using all data together gives b = 0.55±0.11, which note shows that a 2-stage method is required.