- Ground-motion model is:
where A is in g, a

_{1}= -1.43, a_{2}= 0.31, a_{3}= -0.62 and a_{4}= -0.0026 (σ not given). - Note equation only for hard rock sites.
- Equation from a composite of two separate regressions: one using data from 6 earthquakes, 4.7 ≤ M ≤ 6.4 and d primarily between 40 and 820km and one using the same data supplemented with data from 2 earthquakes with M = 1.8 and M = 3.2 and d ≤ 20km to extend results to smaller M and d. Give no details of this composite regression.
- Note regressions are preliminary and should be tested against more data.
- Note careful assessment of uncertainties is required.