1.11 Molas & Yamazaki (1995)
1) Reference
Gilbert L. Molas and Fumio Yamazaki, 1995,
Attenuation of Earthquake Ground Motion in
2) Estimated
physical parameter
- Peak ground acceleration (Horizontal)
- Peak ground velocity (Horizontal)
3) Used
strong motion data
- Area:
- Type of earthquake: recorded by JMA-87 type accelerometers with depths up to 200 km
- Period: 1983 – 1993 years
- Number of events: 387
- Number of records: 2166 pairs
- Magnitude: 4.1 – 7.8
- Epicentral distance: 1 – 200 km
4) Style
of faulting
Not specified
5) Ground
condition
(a) Rock:
- Tertiary or older rock (defined as bed rock), of Diluvium with H < 10m
- T < 0.2 sec
(b) Hard Soil:
- Diluvium with H ≧ 10m or Alluvium with H < 10m
- 0.2 sec ≦ T < 0.4 sec
(c) Medium Soil:
- Alluvium with H < 25m including soft layer with thickness less than 5m
- 0.4 sec ≦ T < 0.6 sec
(d) Soft Soil:
- Other than above, usually soft alluvium or reclaimed land
- T ≧ 0.6 sec
T: natural period
6) Definition
of magnitude
Japan Meteorological Agency magnitude
7) Definition
of source distance
Closest distance to the fault rupture
8) Definition
of horizontal component
larger amplitude of the two horizontal components
9) Applicability
written in the paper
Subduction zone earthquakes (depths of up to 200 km)
10) Empirical
attenuation formula
