Table 2. Earthquake records considered...

Table 2.

Earthquake records considered for back-analysis

Event date	Epicentral distance: km	Focal depth: km	Magnitude, M_W
Motions considered for CAO site
24 October 1993	310	26	6·6
23 May 1994	215	23	5·6
9 October 1995	591	5	8·0
11 January 1997	446	16	7·1
21 June 1999	306	54	6·3
30 September 1999	438	40	7·4
19 September 1985*	420	22	8·0
Motions considered for SCT site
14 September 1995	325	22	7·3
15 June 1999	220	60	6·9
19 September 1985*	425	22	8·0

Event date	Epicentral distance: km	Focal depth: km	Magnitude, M_W
Motions considered for CAO site
24 October 1993	310	26	6·6
23 May 1994	215	23	5·6
9 October 1995	591	5	8·0
11 January 1997	446	16	7·1
21 June 1999	306	54	6·3
30 September 1999	438	40	7·4
19 September 1985*	420	22	8·0
Motions considered for SCT site
14 September 1995	325	22	7·3
15 June 1999	220	60	6·9
19 September 1985*	425	22	8·0

No downhole array data for the 19 September 1985 Michoacán earthquake at the CAO and SCT stations; the recording from the CU station was used with a scale factor of 1·2 and 2·0 for CAO and SCT, respectively, to account for the difference in site conditions; the epicentral distance to the CU site was 394 km.

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