Study on the Safety Evaluation Method of Life-Saving Passage in Building Ruins under the Action of Aftershock

Table 3

Probability percentage (P_i) of aftershock magnitude occurrence after different main shock magnitudes within 168 hour (H).

Main earthquake magnitude	Statistical interval (H)	Aftershock magnitude
		4.0–4.4 (%)	4.5–4.9 (%)	5.0–5.4 (%)	5.5–5.9 (%)	6.0–6.4 (%)	6.5–6.9 (%)	7.0–7.4 (%)	≥7.5
6.0–6.4	≤12	53.19	21.28	25.53	6.38	2.13
	≤24	55.32	27.66	29.79	10.64	2.13
	≤48	55.32	34.04	34.04	12.77	4.26
	≤72	55.32	38.30	34.04	14.89	4.26
	≤96	55.32	38.30	34.04	14.89	4.26
	≤120	55.32	40.43	34.04	14.89	6.38
	≤144	59.57	40.43	36.17	14.89	6.38
	≤168	59.57	42.55	36.17	17.02	6.38
6.5–6.9	≤12	89.29	67.86	21.43	21.43
	≤24	89.29	67.86	35.71	25.00
	≤48	92.86	71.43	35.71	28.57
	≤72	92.86	71.43	42.86	28.57
	≤96	92.86	71.43	42.86	28.57	3.57
	≤120	92.86	82.14	42.86	28.57	3.57
	≤144	92.86	85.71	46.43	28.57	3.57
	≤168	92.86	85.71	46.43	28.57	3.57
7.0–7.4	≤12	100.00	78.57	64.29	35.71	7.14	7.14
	≤24	100.00	85.71	64.29	35.71	7.14	7.14
	≤48	100.00	85.71	71.43	35.71	14.29	14.29
	≤72	100.00	85.71	71.43	50.00	21.43	14.29
	≤96	100.00	85.71	85.71	50.00	21.43	14.29
	≤120	100.00	85.71	85.71	50.00	21.43	14.29
	≤144	100.00	85.71	85.71	50.00	21.43	21.43
	≤168	100.00	85.71	85.71	50.00	21.43	21.43	7.14
≥7.5	≤12	100.00	85.71	71.43	42.86	28.57	14.29	14.29
	≤24	100.00	85.71	85.71	57.14	28.57	28.57	28.57
	≤48	100.00	85.71	85.71	57.14	42.86	28.57	28.57
	≤72	100.00	85.71	85.71	57.14	42.86	28.57	42.86
	≤96	100.00	85.71	85.71	57.14	42.86	28.57	42.86
	≤120	100.00	85.71	85.71	57.14	42.86	28.57	42.86
	≤144	100.00	85.71	85.71	57.14	42.86	28.57	42.86
	≤168	100.00	85.71	85.71	57.14	42.86	28.57	42.86