1.16 Field (2000)

1) Reference

Edward H. Field, 2000, A Modified Ground-Motion attenuation Relationship for Southern, California that Accounts for Detailed Site Classification, Bulletin of the Seismological Society of America, 90, 6B, S209-S221.

2) Estimated physical parameter

- Peak ground acceleration (Horizontal)

- Response spectral acceleration

3) Used strong motion data

- Area: Southern California

- Type of earthquake:

- Period: 1934-1994 years

- Number of events: 28

- Number of records:

- Magnitude: Mw5.1-7.5

- Epicentral distance:

4) Style of faulting

(a) Strike-slip

(b) Reverse-slip

5) Ground condition

30-meter shear wave velocity (Table 1.16-1)

Table 1.16-1 The site-type categories from Will et at. (2000), the 1994 NEHPR range of 30-meter shear wave velocities, and the shear-wave velocity assigned to each category in this study.

6) Definition of magnitude

Moment magnitude

7) Definition of source distance

Closest distance to the vertical projection of rupture

8) Definition of horizontal component

Average horizontal component

9) Applicability written in the paper

Not specified

10) Empirical attenuation formula

μ: predicted natural logarithm of the ground-motion parameter (e.g., ln(PGA))

M: moment magnitude

r_jb: closest distance to the vertical projection of rupture (km)

V_s: average 30-meter shear-wave velocity at the site (m/s)

b₁

b_1ss: strike-slip

b_1rs: reverse-slip

V_a: arbitrary reference site velocity

[Total Variability]

σ: inter-event variability

τ: intra-event variability

Table 1.16-2 The BJF97 model coefficients custom fit to the Southern California Data.