Issued: April 20, 1999 Prepared by: Lalitha Rao No. 16- 99 The following is a list of significant earthquakes during the time period April 12- April 18, 1999 April 12 at 19:01 UTC (11:01 am ADT), mb 4.1, 52 N 39', 168 W 38', depth fixed at 33 km (21 mi): A light earthquake was located by NEIC in the Fox Islands region of Alaska about 22 mi ( 36 km) SSE of Nikolski 122 mi (196 km) SW of Unalaska 123 mi (198 km) SW of Dutch Harbor 144 mi (231 km) E of Amukta Pass 157 mi (253 km) SW of Akutan April 13 at 07:07 UTC (Apr.12, 11:07 pm ADT), ML 3.8, 54 N 43', 164 W 10', depth = 0 km (0 mi): A minor earthquake was located in the Unimak Island region of Alaska about 32 mi ( 51 km) WSW of False Pass 66 mi (106 km) WSW of Cold Bay 76 mi (123 km) ENE of Akutan 78 mi (125 km) WSW of King Cove 111 mi (179 km) ENE of Dutch Harbor April 13 at 07:32 UTC Apr.12, (11:32 pm ADT), ML 4.4, 54 N 44', 164 W 11', depth = 0 km (0 mi): A light earthquake was located in the Unimak Island region of Alaska about 32 mi ( 51 km) WSW of False Pass 66 mi (106 km) WSW of Cold Bay 76 mi (123 km) ENE of Akutan 78 mi (126 km) WSW of King Cove 111 mi (179 km) ENE of Dutch Harbor April 13 at 11:00 UTC (03:00 am ADT), ML 3.8, 54 N 44', 164 W 11', depth = 0 km (0 mi): A minor earthquake was located in the Unimak Island region of Alaska about 32 mi ( 52 km) WSW of False Pass 66 mi (107 km) WSW of Cold Bay 76 mi (123 km) ENE of Akutan 78 mi (126 km) WSW of King Cove 111 mi (179 km) ENE of Dutch Harbor April 13 at 20:04 UTC (12:04 pm ADT), mb 4.8, 53 N 43', 163 W 9', depth fixed at 33 km (21 mi): A light earthquake was located by NEIC in the Unimak Island region of Alaska about 79 mi (127 km) S of False Pass 99 mi (159 km) SSW of King Cove 103 mi (166 km) S of Cold Bay 111 mi (178 km) ESE of Akutan 139 mi (223 km) E of Dutch Harbor April 14 at 11:09 UTC (03:09 am ADT), ML 4.4, 53 N 56', 164 W 38', depth = 41 km (26 mi): A light earthquake was located in the Unimak Island region of Alaska about 48 mi ( 78 km) ESE of Akutan 77 mi (124 km) E of Dutch Harbor 78 mi (125 km) E of Unalaska 81 mi (130 km) SW of False Pass 116 mi (187 km) SW of Cold Bay April 18 at 15:06 UTC (07:06 am ADT), ML 5.4, 60 N 17', 151 W 42', depth = 55 km (34 mi): A moderate earthquake, felt in Homer, Palmer and Anchorage, was located in the Kenai Peninsula region of Alaska about 11 mi ( 18 km) WNW of Clam Gulch 15 mi ( 24 km) WSW of Kasilof 16 mi ( 26 km) N of Ninilchik 24 mi ( 39 km) SW of Kenai 26 mi ( 42 km) WSW of Soldotna _______________________________________________________________________________________________________________________________________________________ DATE TIME LATITUDE LONGITUDE DEPTH PREF. RMS SEH SEZ GAP PHASES MIN Q T REGION, OTHER MAGNITUDES, FELT REPORTS AND COMMENTS YEAR MO DY HR MN SEC DEG MIN DEG MIN KM MAG SEC. KM KM DEG P S DIS _______________________________________________________________________________________________________________________________________________________ 1999 4 12 0 40 42.84 62 10.00N 148 33.74W 37.2 1.3 0.17 1.97 3.76 132 11 6 42 B E CENTRAL AK. 1999 4 12 2 43 20.38 59 34.00N 152 40.20W 85.7 2.1 0.14 1.26 3.00 79 18 14 33 B E COOK INLET. 1999 4 12 3 6 3.24 62 15.72N 151 1.64W 79.3 1.6 0.29 5.15 11.19 99 17 6 42 D E CENTRAL AK. 1999 4 12 4 2 38.21 62 5.94N 148 46.93W 50.2 0.6 0.11 5.59 6.22 209 5 3 37 C E CENTRAL AK. 1999 4 12 4 5 29.63 61 15.43N 146 39.77W 30.5 1.0 0.23 1.10 2.18 85 13 7 23 A E PR WILLIAM SOUND. 1999 4 12 12 15 14.27 62 38.52N 149 49.93W 18.5 1.5 0.23 1.29 1.00 111 15 8 35 A E CENTRAL AK. 1999 4 12 14 40 1.70 63 25.28N 151 13.05W 12.1 2.3 0.28 1.99 1.62 108 18 7 21 A E CENTRAL AK. 1999 4 12 15 30 8.28 63 0.70N 150 26.31W 102.7 2.2 0.20 4.24 4.51 68 17 7 41 B E CENTRAL AK. 1999 4 12 15 48 37.38 62 7.65N 150 2.84W 49.0 2.3 0.27 2.94 3.91 51 18 5 33 B E CENTRAL AK. 1999 4 12 16 27 58.39 60 36.90N 149 7.59W 0.9 1.5 0.27 3.02 3.82 91 16 3 19 B E KENAI PEN. 1999 4 12 16 44 58.03 59 56.81N 152 29.96W 77.2 1.2 0.18 4.58 2.93 55 16 6 30 B E COOK INLET. 1999 4 12 19 1 33.73 52 38.76N 168 38.28W 33.0N 4.1mb R FOX ISLS. 1999 4 12 20 16 28.10 58 10.30N 151 14.20W 20.6 3.0 0.24 7.79 15.57 240 18 5 83 D E KODIAK IS REG. 1999 4 13 3 23 29.55 60 41.18N 151 33.44W 67.0 1.9 0.40 2.47 2.38 139 14 13 19 A E KENAI PEN. 1999 4 13 3 41 45.58 61 39.68N 149 48.80W 48.5 1.7 0.21 2.28 2.53 102 16 10 4 B E COOK INLET. 1999 4 13 7 7 49.45 54 43.42N 164 10.21W 0.0 3.8 0.14 0.47 0.60 141 20 9 6 A a UNIMAK IS. 1999 4 13 7 29 5.13 60 3.87N 152 23.08W 78.3 1.7 0.32 5.88 7.47 127 10 7 32 C E COOK INLET. 1999 4 13 7 32 32.31 54 43.69N 164 10.52W 0.0 4.4 0.14 0.89 1.05 147 21 5 6 A a UNIMAK IS. 1999 4 13 8 33 16.55 60 0.99N 153 28.56W 141.5 2.3 0.17 3.48 2.84 79 17 8 22 B E COOK INLET. 1999 4 13 10 1 47.49 61 36.03N 150 26.89W 57.2 1.7 0.53 3.53 5.00 136 15 10 31 C E COOK INLET. 1999 4 13 11 0 5.42 54 43.67N 164 10.83W 0.0 3.8 0.15 0.89 0.54 155 19 10 6 A E UNIMAK IS. 1999 4 13 16 3 9.61 59 43.66N 152 38.47W 82.8 1.2 0.24 4.96 5.67 151 11 8 34 C E COOK INLET. 1999 4 13 20 4 15.79 53 43.14N 163 9.12W 33.0N 4.8mb R UNIMAK IS. MS 4.7 (NEIS). 1999 4 13 21 2 44.75 63 28.74N 150 5.96W 131.3 3.2 0.25 2.00 3.12 68 15 12 10 B E CENTRAL AK. 1999 4 13 21 53 12.90 61 57.00N 150 30.21W 60.9 1.8 0.22 2.35 2.86 106 16 8 47 B E COOK INLET. 1999 4 14 11 1 38.13 59 50.66N 150 43.75W 30.4 1.7 0.28 1.55 2.26 138 15 9 13 A E KENAI PEN. 1999 4 14 11 9 2.26 53 55.93N 164 37.96W 41.4 4.4 0.14 5.94 9.24 199 21 12 60 C E UNIMAK IS. 1999 4 14 11 39 54.95 61 6.28N 149 9.70W 36.9 2.0 0.15 1.20 3.60 54 15 9 27 B E COOK INLET. 1999 4 14 12 16 44.69 59 39.85N 146 18.72W 0.0 2.5 0.27 3.32 6.90 113 15 8 26 C E GULF OF ALASKA. 1999 4 14 21 36 24.22 61 24.46N 146 53.54W 16.4 0.9 0.09 1.82 11.68 72 9 8 42 D E PR WILLIAM SOUND. 1999 4 15 6 48 0.67 64 12.06N 148 2.99W 0.0 2.3 0.32 1.10 99.00 61 14 6 51 D E CENTRAL AK. 1999 4 15 8 35 54.72 61 41.97N 148 8.07W 16.5 1.5 0.27 1.24 2.22 55 17 10 16 A E PR WILLIAM SOUND. 1999 4 15 13 42 54.34 60 20.00N 144 42.40W 19.0 1.5 0.15 1.93 1.29 115 14 5 6 A E CAPE YAKATAGA. 1999 4 15 13 43 33.23 64 39.88N 149 26.85W 11.2 1.0 0.13 3.88 7.38 186 6 3 20 C E CENTRAL AK. 1999 4 15 17 22 20.24 60 43.87N 151 51.13W 80.0 2.5 0.33 1.42 1.96 53 19 11 34 A E KENAI PEN. 1999 4 15 20 26 50.34 62 19.13N 151 0.80W 72.3 1.1 0.42 9.17 7.83 229 9 5 40 C E CENTRAL AK. 1999 4 15 20 41 10.44 58 53.31N 152 48.36W 62.7 2.9 0.30 1.50 4.15 91 22 16 39 B E KODIAK IS REG. 1999 4 15 23 11 42.38 61 35.36N 149 48.91W 50.7 1.4 0.19 2.76 3.72 173 10 7 8 B E COOK INLET. 1999 4 16 1 18 13.03 60 22.36N 150 17.56W 39.0 2.2 0.34 1.30 5.25 102 15 10 53 C E KENAI PEN. 1999 4 16 2 16 54.01 61 58.10N 149 53.88W 44.1 1.9 0.32 1.46 2.36 66 17 11 35 A E COOK INLET. 1999 4 16 3 10 49.31 60 58.33N 146 58.93W 24.8 0.6 0.10 3.56 2.13 105 8 4 12 B E PR WILLIAM SOUND. 1999 4 16 4 55 28.57 55 46.37N 162 1.73W 14.3 2.6 0.40 5.77 2.06 289 11 9 8 C E ALASKA PEN. 1999 4 16 4 56 36.81 55 43.66N 161 54.92W 0.0 2.2 0.24 2.83 6.01 221 12 7 10 C E ALASKA PEN. 1999 4 16 8 6 25.20 61 2.43N 148 54.03W 9.8 1.9 0.29 1.13 2.77 56 16 13 37 B E PR WILLIAM SOUND. 1999 4 16 9 15 30.55 61 1.49N 146 28.13W 14.3 2.2 0.40 0.89 0.74 54 14 7 8 A E PR WILLIAM SOUND. 1999 4 16 9 46 17.22 62 33.07N 151 15.09W 93.5 2.7 0.23 3.33 4.72 87 16 11 53 B E CENTRAL AK. 1999 4 16 9 48 14.25 58 10.33N 155 21.19W 0.0 0.7 0.08 2.77 39.34 204 5 3 5 D a ALASKA PEN. 1999 4 16 10 18 22.95 61 33.11N 146 36.60W 9.0 1.3 0.17 0.99 3.02 46 18 12 37 B E PR WILLIAM SOUND. 1999 4 16 11 20 59.43 63 23.30N 150 57.86W 30.4 1.0 0.13 5.57 10.16 175 5 3 18 D E CENTRAL AK. 1999 4 17 3 5 21.28 59 51.75N 153 35.87W 146.2 3.7 0.23 1.74 2.59 66 21 11 31 B E COOK INLET. _______________________________________________________________________________________________________________________________________________________ DATE TIME LATITUDE LONGITUDE DEPTH PREF. RMS SEH SEZ GAP PHASES MIN Q T REGION, OTHER MAGNITUDES, FELT REPORTS AND COMMENTS YEAR MO DY HR MN SEC DEG MIN DEG MIN KM MAG SEC. KM KM DEG P S DIS _______________________________________________________________________________________________________________________________________________________ 1999 4 17 9 27 39.40 62 15.94N 150 12.04W 8.2 2.1 0.52 4.81 3.67 139 15 5 16 B CENTRAL AK. 1999 4 17 10 26 40.31 59 39.52N 152 32.35W 76.9 2.3 0.25 1.59 2.79 75 16 12 39 B E COOK INLET. 1999 4 17 13 0 4.37 63 7.50N 149 45.48W 90.9 2.0 0.22 2.61 2.06 71 16 11 18 B E CENTRAL AK. 1999 4 17 16 40 45.24 60 39.98N 143 14.71W 7.4 2.3 0.60 0.80 1.06 80 14 6 13 A CAPE YAKATAGA. 1999 4 17 18 49 27.93 60 52.25N 151 38.93W 79.1 1.7 0.19 4.27 7.25 72 17 10 27 C E KENAI PEN. 1999 4 17 19 21 13.06 59 56.05N 152 18.47W 65.0 2.0 0.26 3.37 5.40 135 15 6 40 C E COOK INLET. 1999 4 17 19 59 39.06 54 29.50N 162 13.74W 74.7 3.3 0.24 5.03 5.84 213 21 18 53 C E ALASKA PEN. 1999 4 17 20 55 1.25 59 45.44N 151 35.85W 57.8 2.7 0.31 1.33 2.77 53 21 16 11 B E KENAI PEN. 1999 4 17 22 9 8.36 59 13.86N 153 33.28W 107.1 3.1 0.19 2.92 3.21 94 17 14 14 B E COOK INLET. 1999 4 17 23 11 0.59 59 19.96N 151 54.15W 64.8 1.9 0.29 2.29 3.65 186 15 11 39 B E KENAI PEN.