- Ground-motion model is: where a is in gal, b1 = -3.64, b2 = 1.29, c1 = -0.99 and c2 = 0.38 (σ not given).
- Focal depths between 0 and 130km.
- Regress recorded PGA of each earthquake, i, on log 10a = βi - νi log 10x, to find βi and νi. Then find b1
and b2 from β = b1 + b2M and c1 and c2 from ν = c1 + c2M.
- Also consider ν = d1β.
- Find β and ν from 6 earthquakes (magnitudes between 5.4 and 6.1) from Tokyo-Yokohama area are much
higher than for other earthquakes, so ignore them. Conclude that this is due to effect of buildings on