IEG 환경지질연구정보센터

전체 글

(1) , 36, 3 , 201-212, 2003 Econ. Environ. Geol., 36(3), 201-212, 2003.

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(3) . Discrimination of Natural Earthquakes and Explosions in Spectral Domain Sung Kyun Kim and Myeong Su Kim School of Earth Systems and Environmental Sciences, Chonnam National University, Kwangju 500-757, Korea Recently, the ability of earthquake detection in the Kyungsang Basin of southeastern Korean Peninsula is greatly improved since seismic stations including seismic network of KIGAM(Korea Institute of Geoscience and Mineral Resources) have been significantly increased. However, a large number of signals from explosions are recorded because of frequent medium to large chemical explosions. The discrimination between natural earthquakes and explosions in the Basin has become an important issue. High frequency local records from 43 earthquakes and 43 explosions with comparable magnitude are selected to establish a reliable discrimination technique in the Basin. Several discrimination techniques in spectral domain using spectral amplitude ratios among Pg, Sg, and Lg waves are widely examined with the selected data. Among them the Pg/Lg spectral ratio method is appeared to be a good discrimination technique to improve the discrimination power. Multivariate discriminant analysis is also applied to the Pg/Lg spectral ratios. The discrimination power of the Pg/Lg ratios for distance corrected three component record compared to uncorrected vertical component one shows distinct improvement. In the frequency band 4 to 14 Hz, Pg/Lg spectral ratio for distance corrected three component record provides discrimination power with a total misclassification probability of only 0.89%.. Discrimination of explosions, Pg/Lg spectral ratio, multivariate discriminant analysis.

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(55) A6 5 Ò 8C 9L ¬? op . . # $. . . . . . . . . . Table 1. List of earthquake data used in this study. Origin Time. Event No.. Date. Time. Latitude (oN). Longitude (oE). Depth (km). ML (KIGAM). Number of record. 1 2 3 4 5 6. 1995/02/14 1995/02/16 1995/09/10 1995/09/10 1995/09/11 1995/10/24. 07:02:06 07:02:36 04:09:12 05:09:32 08:09:24 05:10:05. 35.7052 35.8167 35.6022 35.7176 35.7202 35.9667. 129.3706 129.4061 129.4530 129.4015 129.4166 129.2035. 07.92 10.00 06.03 12.94 10.51 07.93. 2.2 2.1 2.1 2.2 1.8 2.3. 5 4 3 4 5 3. 7 8 9 10 11 12 13 14 15 16 17 18. 1996/02/04 1996/02/05 1996/02/27 1996/02/28 1996/03/18 1996/05/01 1996/05/05 1996/05/16 1996/06/04 1996/06/20 1996/10/22 1996/11/25. 20:02:14 06:02:14 09:02:44 07:02:22 22:03:34 01:05:38 02:05:49 11:05:43 16:06:26 22:06:18 01:10:54 00:11:50. 35.7167 35.7217 35.9426 35.9428 35.7186 35.9900 35.8078 35.3050 35.8016 35.8228 35.6844 35.7421. 129.3929 129.3923 129.4868 129.4872 129.3925 129.5673 129.4541 129.1091 129.3265 129.4033 129.2689 129.3862. 13.74 12.97 09.96 10.33 14.32 16.02 09.28 15.03 12.65 11.26 13.34 01.59. 1.8 1.8 1.9 2.8 1.8 1.9 2.3 3.0 2.0 2.2 1.9 2.8. 4 4 3 5 4 4 4 6 3 3 3 4. 19 20 21 22. 1997/06/16 1997/10/11 1997/12/04 1997/12/25. 10:06:14 07:10:29 02:12:53 06:12:22. 35.6035 35.9172 35.7093 35.5522. 128.9731 128.8402 129.5375 129.4093. 01.42 10.93 10.00 06.65. 2.9 2.7 2.0 1.8. 3 7 3 3. 23 24 25 26 27 28 29 30 31. 1999/02/12 1999/04/24 1999/06/02 1999/06/05 1999/07/05 1999/08/17 1999/08/21 1999/09/02 1999/09/12. 12:01:06 13:05:14 18:12:21 20:58:19 14:39:01 21:38:10 10:01:52 00:08:12 05:56:51. 35.7257 35.8428 35.8357 35.8414 35.7835 36.2067 35.8351 35.8392 35.8427. 129.2222 129.2555 129.3353 129.2591 129.3414 129.5357 129.2590 129.2570 129.2425. 05.00 05.06 01.43 07.48 01.43 10.00 09.41 08.82 05.90. 2.0 3.3 4.0 2.4 1.7 2.3 1.8 2.2 3.2. 3 4 4 6 4 7 3 5 7. 32 33 34 35. 2000/01/20 2000/05/17 2000/05/22 2000/06/07. 07:05:58 17:42:08 05:34:46 01:09:04. 35.7838 35.8422 35.9168 35.7012. 129.3854 129.2567 129.3573 129.4079. 10.78 08.32 07.37 06.16. 1.5 1.9 1.7 1.5. 3 4 4 5. 36 37 38 39 40 41 42 43. 2001/02/10 2001/03/06 2001/02/14 2001/03/11 2001/03/11 2001/04/25 2001/09/16 2001/10/26. 16:23:28 04:57:03 01:02:09 07:18:41 14:05:38 13:18:03 09:05:42 08:57:42. 35.8465 35.8520 35.0367 35.7363 35.7278 36.0115 35.7112 35.7842. 129.2598 129.2612 128.2785 129.4203 129.4120 129.1132 129.3608 129.3792. 02.5 06.54 05.6 04.4 02.6 07.56 05.32 01.25. 2.4 1.7 2.6 1.6 2.1 1.8 1.9 2.4. 5 4 4 4 3 3 3 5.

(56) . Table 2. List of explosion data used in this study. Origin Time. Event No.. Date. Time. Latitude (oN). Longitude (oE). ML (KIGAM). Number of record. 1 2 3. 1995/02/16 1995/11/02 1995/12/30. 17:29:29 12:44:24 16:12:18. 35.819 35.972 35.734. 129.118 129.367 129.292. 1.3 1.5 1.4. 3 3 3. 4 5. 1996/02/15 1996/11/19. 18:20:30 15:25:18. 35.500 35.855. 129.282 129.306. 1.2 1.0. 3 4. 6 7 8 9 10 11 12. 1999/10/02 1999/10/13 1999/10/13 1999/10/13 1999/11/05 1999/11/14 1999/11/19. 16:25:22 10:05:19 18:00:12 12:53:10 09:50:55 13:15:28 14:24:19. 35.787 35.737 35.353 35.956 35.808 35.404 35.788. 129.289 128.957 129.018 129.438 129.079 129.005 129.166. 1.4 1.9 1.7 1.7 2.0 1.2 1.3. 4 3 4 5 4 4 3. 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28. 2000/07/04 2000/07/13 2000/07/27 2000/07/27 2000/07/29 2000/08/18 2000/08/29 2000/11/08 2000/03/25 2000/04/22 2000/05/06 2000/05/29 2000/05/29 2000/06/01 2000/06/05 2000/06/24. 12:01:06 13:05:14 18:12:21 18:58:19 15:39:01 12:38:10 10:01:52 13:08:12 13:46:41 16:16:51 15:55:21 13:26:56 12:41:00 12:55:11 17:06:11 15:48:01. 36.003 35.744 35.726 35.725 35.825 36.007 35.835 35.952 35.553 35.907 36.006 35.981 35.486 35.006 35.725 36.007. 129.062 128.894 129.168 129.167 129.045 129.039 129.329 129.479 129.073 129.426 129.042 129.182 129.187 129.043 129.240 129.042. 1.5 1.8 1.7 2.0 1.6 1.7 1.8 1.9 0.8 1.9 1.9 1.7 1.3 1.6 1.0 1.9. 3 4 4 6 4 7 3 5 7 3 4 4 5 3 3 3. 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43. 2001/02/01 2001/02/11 2001/03/15 2001/04/09 2001/04/14 2001/05/02 2001/05/15 2001/06/21 2001/06/27 2001/07/10 2001/07/10 2001/07/28 2001/10/25 2001/04/13 2001/04/18. 18:08:01 15:32:52 13:51:09 11:36:02 12:18:54 13:43:26 17:58:28 15:25:32 09:48:04 18:50:01 11:43:52 16:58:34 18:46:57 15:35:08 11:18:29. 35.575 35.583 35.916 35.832 35.495 35.727 35.552 35.933 35.602 35.341 35.480 35.573 35.750 35.991 35.976. 129.028 129.028 129.496 129.042 129.275 129.166 129.189 129.196 129.204 129.191 129.338 129.232 129.064 129.107 129.135. 1.4 1.3 2.2 1.7 1.5 1.8 1.3 1.8 1.6 1.0 1.9 2.1 2.1 1.5 1.5. 3 5 4 3 3 4 5 5 3 3 4 4 3 3 5. A3»; ÓÔ

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(134) . . Network-averaged Log10(Pg/Lg) spectral amplitude ratios of 3-component at 6 discrete frequency points are plotted for earthquakes(circles) and explosions(triangles) in the upper diagram. A mean value of each discrete frequency point is plotted for earthquakes(circles) and explosions(triangles) with their arms representing one standard deviation in the lower diagram.. µÎ×ô c1x ÈU4 5; ÇC 78

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