Electronic Supplement to
Ground-Motion Prediction Equation for the Chilean Subduction Zone

by Gonzalo A. Montalva, Nicolás Bastías, and Adrian Rodriguez-Marek

Table S1. Regression Coefficients for the High-Quality (HQ) Model

Period (s)	No. of Data Points	θ1	θ4	θ5	θ2	θ3	θ6	θ14	θ10	θ11	θ12	τ	ϕS2S	ϕSS	σ
0.00	507	4.33904	0.02403	−0.57634	−1.40171	0.25953	−0.00045	−0.17782	2.22020	−0.00365	1.07051	0.48274	0.35438	0.29315	0.66675
0.02	507	4.11408	0.08969	−0.48818	−1.34723	0.24516	−0.00072	−0.22187	2.47865	−0.00426	1.08967	0.49080	0.35919	0.29672	0.67672
0.05	507	6.19729	0.67116	−0.04569	−1.74389	0.13681	0.00000	−0.23525	2.77565	−0.00361	1.31084	0.53613	0.38169	0.29003	0.71919
0.075	507	6.91598	0.90902	0.24000	−1.83784	0.08417	0.00000	−0.07695	2.05513	−0.00457	1.54919	0.58232	0.41023	0.27892	0.76497
0.1	507	7.30576	1.20376	0.49015	−1.87863	0.02296	0.00000	−0.13372	2.32710	−0.00443	1.69618	0.56901	0.45716	0.28010	0.78181
0.15	505	6.37434	0.47463	−0.13621	−1.65002	0.17170	0.00000	−0.04925	1.63263	−0.00397	1.94062	0.53998	0.42642	0.29938	0.75037
0.2	506	5.17666	0.60543	0.05630	−1.38373	0.14477	−0.00077	−0.14038	1.92318	−0.00564	2.10395	0.46322	0.39664	0.33550	0.69603
0.25	502	5.09862	0.32673	−0.23652	−1.38266	0.20473	0.00000	−0.28698	2.52967	−0.00506	2.29447	0.46462	0.36564	0.32956	0.67689
0.3	497	4.19451	0.17885	−0.40748	−1.17839	0.23819	−0.00084	−0.50847	3.29515	−0.00091	2.37295	0.41917	0.35375	0.33449	0.64244
0.4	508	2.73425	0.09111	−0.54916	−0.84470	0.26634	−0.00196	−0.41026	2.71054	−0.00192	2.52418	0.41862	0.37225	0.36362	0.66786
0.5	508	3.50224	−0.20203	−0.73381	−1.08259	0.33368	−0.00023	−0.31852	2.12172	−0.00076	2.45739	0.43451	0.31389	0.37367	0.65342
0.6	507	4.04085	−0.06346	−0.70606	−1.22144	0.32475	0.00000	−0.41982	2.61327	0.00006	2.37852	0.43404	0.29805	0.36857	0.64270
0.75	509	3.27979	0.20133	−0.44398	−1.11319	0.28298	0.00000	−0.56422	3.16341	0.00377	2.13563	0.45313	0.33310	0.36698	0.67154
1	513	2.66937	0.69849	0.14855	−1.08989	0.18811	0.00000	−0.71573	3.92867	0.00341	1.68511	0.46525	0.36033	0.38278	0.70201
1.5	515	1.50384	0.96980	0.30846	−0.98018	0.15759	0.00000	−0.82582	4.38151	0.00431	0.90771	0.42219	0.40814	0.36307	0.69039
2	510	0.65359	0.75641	0.13170	−0.90785	0.21776	0.00000	−0.91211	4.89965	0.00225	0.14282	0.38592	0.37199	0.37107	0.65192
2.5	503	0.19981	0.27306	−0.29340	−0.89456	0.32697	0.00000	−0.69913	3.93951	−0.00063	−0.14699	0.38407	0.36573	0.36636	0.64458
3	503	0.15382	0.20178	−0.47779	−0.92841	0.35371	0.00000	−0.52456	3.07250	−0.00170	−0.13205	0.38146	0.39403	0.33519	0.64275
4	488	−0.32325	0.11519	−0.62158	−0.91160	0.38631	−0.00023	−0.62428	3.57650	−0.00097	−0.25199	0.38539	0.39148	0.33086	0.64129
5	476	−0.71442	0.00032	−0.64517	−0.93657	0.40696	0.00000	−0.57966	3.37450	−0.00037	−0.26001	0.40439	0.40978	0.31169	0.65468
6	457	−0.55860	0.45722	−0.32197	−1.00492	0.32533	−0.00044	−0.50439	2.97734	0.00056	−0.34989	0.39921	0.38271	0.30916	0.63357
7.5	443	−0.50613	0.79915	0.19124	−1.12134	0.25931	0.00000	−0.64781	3.65917	0.00150	−0.23954	0.41293	0.21232	0.29010	0.54749
10	400	−1.09386	0.71658	0.23192	−1.09180	0.27005	0.00000	−0.33837	2.18976	−0.00178	−0.18020	0.40111	0.28240	0.29420	0.57201

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