- Ground-motion model is:
where Y (T) is in cm∕s2, b

_{1}(0) = 1.1064, b_{2}(0) = 0.2830, b_{3}(0) = 0.0076, b_{4}(0) = 0.6322 and σ = 0.303 for horizontal PGA and b_{1}(0) = 0.7134, b_{2}(0) = 0.3091, b_{3}(0) = 0.0069, b_{4}(0) = 0.7421 and σ = 0.301 for vertical PGA. - Records from 225 stations of K-Net network with 39.29 ≤ V
_{s,30}≤ 760.25m∕s (mean V_{s,30}= 330.80m∕s. - Select earthquakes that occurred within the region of the boundary of the Okhotsk-Amur plates (NE Japan bordering Sea of Japan) defined by its horizontal location and vertically, to exclude earthquakes occurring in other plates or along other boundaries.
- Focal depths, D, between 8 and 43km with mean depth of 20.8km.
- Mean value of M is 4.72.
- Mean r
_{epi}is 84.67km. - State that exclude records with PGA < 5cm∕s2 (although ranges of PGAs given include records with PGA < 5cm∕s2).
- Horizontal PGA range: 4.15–411.56cm∕s2. Vertical PGA range: 0.50–163.11cm∕s2.
- Originally use this form: log Y (T) = b
_{1}(T) + b_{2}(T)M - b_{3}(T)D - log(R) + b_{5}(T)R but find b_{5}(T) > 0. Regress using the 379 records from sites with V_{s,30}> 300m∕s and still find b_{5}(T) > 0 but report results for investigating site effects. - Plot residuals w.r.t. r
_{hypo}and find mean of residuals is zero but find some high residuals. - Note that need to refine model to consider site effects.