Stability Assessment of the Excavated Rock Slope at the Dagangshan Hydropower Station in China Based on Microseismic Monitoring

Table 1

Seismic source parameters of typical blasting events.

Event	Northing (m)	Easting (m)	Depth (m)	Moment magnitude	Seismic moment (Nm)	Radiated energy (J)	Es/Ep	Source radius (m)	Static stress drop (Pa)	Apparent stress (Pa)
1	3,259,192	520,819	1078	−0.93	1.02E + 08	1.35E + 02	8.95	6.38E + 00	4.78E + 05	2.30E + 04
2	3,259,426	520,961	1181.7	−0.81	1.08E + 08	2.86E + 01	31.34	1.24E + 01	8.85E + 04	4.61E + 03
3	3,259,230	520,842	1060	−1.16	4.80E + 07	3.48E + 01	3.2	5.39E + 00	3.19E + 05	1.26E + 04
4	3,259,244	520,739	1062.7	−1.34	1.84E + 07	3.42E + 00	1.72	5.42E + 00	6.86E + 04	3.23E + 03
5	3,259,206	520,800	1042.7	−0.51	3.32E + 08	6.41E + 02	10.63	6.78E + 00	8.90E + 05	3.36E + 04
6	3,259,197	520,831	1083.9	−0.88	8.33E + 07	1.18E + 02	7.71	3.86E + 00	6.85E + 05	2.47E + 04
7	3,259,202	520,874	1064.3	−1.1	4.84E + 07	6.49E  + 01	10.92	6.66E + 00	8.60E + 04	2.34E + 04
8	3,259,402	520,957	1171.5	−0.87	8.19E + 07	1.50E + 01	11.25	1.04E + 01	3.15E + 04	3.19E + 03
9	3,259,227	520,783	1032.9	−0.85	1.58E + 08	1.50E + 02	7.53	5.93E + 00	5.07E + 05	1.65E + 04
10	3,259,304	520,757	987.6	−0.82	1.35E + 08	3.75E + 02	10.05	5.13E + 00	7.75E + 05	4.82E + 04
11	3,259,177	520,855	1182.2	−0.71	2.79E + 08	1.07E + 02	12.89	8.58E + 00	2.20E + 05	6.69E + 03
12	3,259,441	520,971	1139.2	−1.03	6.98E + 07	4.37E + 00	19.8	1.01E + 01	2.62E + 04	1.09E + 03
13	3,259,202	520,790	1037	−0.74	1.64E + 08	1.82E + 02	11.47	7.15E + 00	5.44E + 05	1.94E + 04
14	3,259,226	520,804	1039.2	−0.74	1.36E + 08	2.12E + 02	20.71	8.93E + 00	3.78E + 05	2.71E + 04
15	3,259,277	520,754	995.3	−0.78	1.64E + 08	2.38E + 02	21.7	6.46E + 00	5.44E + 05	2.53E + 04
16	3,259,193	520,814	1074.9	−0.83	1.26E + 08	2.04E + 02	8.55	8.01E + 00	2.95E + 05	2.81E + 04
17	3,259,368	520,839	1140.6	−1.11	3.83E + 07	1.96E + 00	8.23	9.36E + 00	1.77E + 04	8.91E + 02
18	3,259,206	520,810	1047.6	−0.24	7.16E + 08	3.97E + 03	19.87	8.65E + 00	1.96E + 06	9.66E + 04
19	3,259,201	520,802	1046.7	−0.58	2.62E + 08	3.47E + 02	35.42	9.18E + 00	5.55E + 05	2.30E + 04
20	3,259,303	520,764	992.8	−0.95	1.10E + 08	9E + 01	5.43	6.27E + 00	3.97E + 05	8.12E + 03
21	3,259,380	520,768	1123.9	−1.05	1.17E + 08	2.53E + 02	5.04	8.61E + 00	3.24E + 04	3.78E + 04
22	3,259,192	520,808	1069.7	−0.76	1.43E + 08	1.42E + 02	10.39	7.77E + 00	3.61E + 05	1.72E + 04
23	3,259,368	520,794	1154.1	−0.92	9.27E + 07	5.56E + 00	64.86	1.58E + 01	1.29E + 04	1.04E + 03
24	3,259,234	520,781	1020.3	−0.21	1.02E + 09	5.44E + 03	22.17	9.68E + 00	1.85E + 06	9.32E + 04
25	3,259,218	520,807	1056	−0.9	6.20E + 07	8.22E + 01	286.05	6.41E + 00	3.86E + 05	2.31E + 04
1587	3,259,234	520,813	1184.1	−1.19	2.95E + 07	1.28E + 00	20.43	1.24E + 01	2.50E + 04	7.58E + 02