Multisource Ground Motion Attenuation Relationship Model for the Vertical Component of the Wenchuan Earthquake on May 12, 2008

Table 1

Regression coefficients for vertical ground motion of the Wenchuan earthquake.

Period	a0	a1	a2	a3	a4	σlnY	σlnV/H
PGV	7.044	−1.047	14	0.000 96	−0.260	0.627	0.323
PGA	1.672	−0.810	14	−0.002 05	−0.713	0.826	0.297
0.010 s	1.640	−0.798	14	−0.002 16	−0.718	0.828	0.299
0.020 s	1.836	−0.819	14	−0.002 19	−0.728	0.906	0.333
0.030 s	2.511	−0.923	14	−0.002 28	−0.698	0.970	0.388
0.040 s	1.157	−0.510	14	−0.005 70	−0.781	0.956	0.357
0.050 s	0.585	−0.336	14	−0.006 99	−0.766	0.955	0.374
0.060 s	0.221	−0.229	14	−0.007 35	−0.763	0.949	0.427
0.070 s	0.594	−0.310	14	−0.006 82	−0.678	0.913	0.486
0.080 s	0.832	−0.356	14	−0.006 51	−0.687	0.898	0.482
0.090 s	0.894	−0.366	14	−0.006 29	−0.699	0.899	0.527
0.100 s	1.790	−0.601	14	−0.004 52	−0.799	0.890	0.515
0.200 s	1.130	−0.524	14	−0.003 36	−0.821	0.802	0.443
0.300 s	0.804	−0.520	14	−0.002 85	−0.572	0.723	0.465
0.400 s	1.291	−0.678	14	−0.001 84	−0.464	0.673	0.564
0.500 s	1.533	−0.803	14	−0.000 67	−0.330	0.707	0.389
0.600 s	2.021	−0.965	14	0.000 87	−0.305	0.678	0.434
0.700 s	2.142	−1.030	14	0.001 41	−0.186	0.701	0.456
0.800 s	2.289	−1.092	14	0.001 82	−0.160	0.704	0.352
0.900 s	2.292	−1.110	14	0.001 95	−0.115	0.735	0.430
1.000 s	2.342	−1.150	14	0.002 13	−0.041	0.728	0.428
3.000 s	3.185	−1.562	25	0.003 77	−0.032	0.737	0.315
3.200 s	3.678	−1.683	25	0.004 14	0.041	0.745	0.310
4.000 s	2.559	−1.416	25	0.001 99	0.175	0.811	0.385
5.000 s	0.192	−0.939	14	0.000 51	0.351	0.810	0.395

Note. 0.010 s–3.000 s are 5% damping ratio PSA.