Observed Seismicity - University of Kentucky

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14 Appendix A installed seismic stations in western Kentucky have also been upgraded. These new and upgraded seismic stations, in combination with existing seismic networks, will provide better information on earthquake activity in the region and help reduce the uncertainty about the northern boundary of the New Madrid Seismic Zone. Because of the time-dependent nature of earthquake activity, a minimum of 2 years of observation is required. A sensitivity analysis was conducted, based on the data sets used by the U.S. Geological Survey. This analysis showed that the seismic hazard in western Kentucky is dominated by the earthquakes from the New Madrid Seismic Zone. The analysis also showed that a large uncertainty was inherent in the ground-motion hazard for western Kentucky: the ground motion for western Kentucky, particularly the Jackson Purchase area, has been overpredicted by as much as a factor of two. A full-scale study is needed to provide a credible and defensible seismic hazard assessment for western Kentucky. Anticipated time for the full-scale study is 18 to 24 months. The seismic issue in western Kentucky also requires intensive communications with related government and nongovernment agencies. The principal investigators have actively communicated with personnel from Federal agencies, including the U.S. Geological Survey and Nuclear Regulatory Commission, and other national experts on seismic hazard assessment in the central United States, western Kentucky in particular. A workshop was held on November 18, 2002, in Lexington to discuss seismic hazards, risk, and design maps in the central United States, especially western Kentucky. It was attended by 110 geologists, seismologists, engineers, emergency managers, and others from the related Federal and State agencies. Three key problems were identified at the workshop: 1. The probabilistic ground-motion hazard with 2 percent probability of being exceeded in 50 years for the New Madrid region (including western Kentucky) is overly conservative. 2. There are many inconsistencies in the NEHRP 97 seismic design maps. These inconsistencies have resulted in very high seismic design for western Kentucky. 3. There is lack of communication between the map developers and the users in the central United States.
Appendix B 15 Appendix B: Earthquakes Occurring in the New Madrid Seismic Zone between January and June 2003 Date Time Latitude Longitude Depth Magnitude (UTC) (Degrees) (Degrees) (km) 2003/01/02 06:18:36.00 36.32 –89.53 8.7 1.7 2003/01/02 11:29:40.00 36.24 –89.52 6.8 1.8 2003/01/03 16:17:07.00 37.83 –88.09 5 2.9 2003/01/04 04:16:42.00 36.24 –89.5 7.7 1.5 2003/01/06 06:45:06.00 36.58 –89.6 9.7 1.9 2003/01/07 03:24:59.00 36.2 –89.46 8.6 1.8 2003/01/09 10:27:03.00 36.3 –89.5 7.7 2 2003/01/14 05:09:34.00 36.48 –89.55 7.9 1.9 2003/01/20 06:47:09.00 36.47 –89.55 8.3 1.6 2003/01/26 07:58:56.00 36.28 –89.51 8.4 1.5 2003/02/03 12:44:33.00 36.17 –89.89 17.5 2.3 2003/02/03 22:27:23.00 36.5 –89.54 7 1.8 2003/02/08 05:51:06.00 36.5 –89.54 8.2 0.9 2003/02/08 05:52:43.00 36.5 –89.55 8.3 1.9 2003/02/09 12:24:03.00 36.42 –89.64 12 0.6 2003/02/09 12:24:12.00 36.42 –89.64 12.2 1.7 2003/02/09 21:13:34.00 36.42 –89.63 13 2.3 2003/02/10 04:23:10.00 36.42 –89.64 11.9 1.8 2003/02/14 02:41:05.00 36.55 –89.69 7.3 1.8 2003/02/14 03:53:31.00 36.45 –89.53 7.7 1.8 2003/02/19 10:56:39.00 36.42 –89.64 12.6 1.6 2003/02/20 12:06:15.00 36.25 –89.51 6.8 1.6 2003/02/24 08:29:27.00 35.99 –90.05 7.4 2.3 2003/02/28 08:15:12.00 36.53 –89.56 7.6 1.5 2003/03/04 07:00:27.00 35.88 –89.98 19.5 1.7 2003/03/04 10:51:52.00 36.26 –89.46 7.3 1.5 2003/03/09 07:45:18.00 35.68 –90.28 2.6 1.3 2003/03/13 13:43:32.00 36.29 –89.48 6.3 1.5 2003/03/17 13:03:21.00 36.53 –89.6 6.6 1.5 2003/03/18 17:19:42.00 36.27 –89.53 8.8 1.5 2003/03/18 22:00.56.00 36.37 –89.55 9.4 1.7 2003/03/21 00:49:50.00 36.53 –89.65 11 1.6 2003/03/23 08:05:13.00 36.58 –89.58 7.6 1.8 2003/03/23 09:46:40.00 36.49 –89.54 7.2 1.5 2003/03/28 03:19:10.00 36.5 –89.57 9.4 1.3 2003/03/28 09:01:22.00 36.39 –89.51 7.6 1.8 2003/03/29 08:52:55.00 36.51 –89.56 8.5 1.1 2003/03/31 04:11:37.00 36.5 –89.55 7.1 1.8 2003/04/01 04:20:16.00 36.61 –89.9 9.4 1.5
Page 1 and 2: Observed Seismicity (Earthquake Act
Page 3 and 4: Contents Executive Summary.........
Page 5 and 6: Executive Summary Although it has n
Page 7 and 8: Data Evaluation and Analysis 3 stal
Page 9 and 10: Discussion 5 Figure 2. Recordings o
Page 11 and 12: Discussion 7 Table 3. Seismic and s
Page 13 and 14: Discussion 9 Figure 9. Seismic reco
Page 15 and 16: North Discussion 11 91° 38° 88°
Page 17: Appendix A 13 Appendix A: Providing

Observed Seismicity - University of Kentucky

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