Monthly Seismicity Report For December 1, 2017 to December 31, 2017

During December 2017, the Alaska Earthquake Center located 2960 earthquakes within the state. Of these, twelve were larger than or equal to magnitude 4.0. 13 events were felt. The largest earthquake located in Alaska this month was a light earthquake of magnitude 4.8 that occurred on December 9 at 18:37:33.759 UTC (December 9, 09:37:33.759 AKST), 57 miles SW of Atka.

Notable Events in Descending Order of Magnitude

December 9 at 18:37:33.759 UTC (December 9, 09:37:33.759 AKST), Ml 4.8, 51.51N -174.95W, depth=25.5 km:
A light earthquake was located in ANDREANOF ISLANDS, ALEUTIAN IS..
This earthquake was:
57 miles ( 91 km) SW of Atka
77 miles (124 km) ESE of Adak
138 miles (223 km) WSW of Amukta Pass

December 23 at 19:11:02.365 UTC (December 23, 10:11:02.365 AKST), Ml 4.6, 54.95N -160.38W, depth=26.4 km:
A light earthquake was located in ALASKA PENINSULA.
This event was felt in Sand Point.
This earthquake was:
27 miles ( 43 km) S of Sand Point
77 miles (123 km) E of King Cove
79 miles (127 km) SSE of Nelson Lagoon

December 4 at 10:23:35.867 UTC (December 4, 01:23:35.867 AKST), Ml 4.4, 55.83N -155.99W, depth=56.0 km:
A light earthquake was located in SOUTH OF ALASKA.
This earthquake was:
98 miles (158 km) ESE of Chignik
103 miles (166 km) ESE of Chignik Lagoon
103 miles (166 km) SW of Akhiok

December 28 at 14:58:41.435 UTC (December 28, 05:58:41.435 AKST), Ml 4.3, 52.51N -174.46W, depth=187.8 km:
A light earthquake was located in ANDREANOF ISLANDS, ALEUTIAN IS..
This earthquake was:
24 miles ( 39 km) NNW of Atka
103 miles (165 km) ENE of Adak
104 miles (168 km) W of Amukta Pass

December 3 at 04:35:29.162 UTC (December 2, 19:35:29.162 AKST), Ml 4.3, 52.20N -175.68W, depth=167.8 km:
A light earthquake was located in ANDREANOF ISLANDS, ALEUTIAN IS..
This earthquake was:
47 miles ( 76 km) ENE of Adak
63 miles (101 km) W of Atka
156 miles (251 km) W of Amukta Pass

December 27 at 11:39:36.093 UTC (December 27, 02:39:36.093 AKST), Ml 4.3, 52.16N -169.90W, depth=25.7 km:
A light earthquake was located in FOX ISLANDS, ALEUTIAN ISLANDS.
This earthquake was:
69 miles (111 km) SW of Nikolski
90 miles (144 km) E of Amukta Pass
182 miles (293 km) E of Atka

December 1 at 02:47:40.628 UTC (November 30, 17:47:40.628 AKST), Ml 4.2, 60.25N -152.67W, depth=103.3 km:
A light earthquake was located in SOUTHERN ALASKA.
This event was felt in Homer, Anchor Point, and Anchorage.
This earthquake was:
37 miles ( 60 km) WNW of Ninilchik
44 miles ( 71 km) NW of Anchor Point
44 miles ( 71 km) W of Clam Gulch

December 26 at 02:47:32.838 UTC (December 25, 17:47:32.838 AKST), Ml 4.2, 51.14N 178.30W, depth=8.9 km:
A light earthquake was located in RAT ISLANDS, ALEUTIAN ISLANDS.
This earthquake was:
40 miles ( 65 km) SW of Amchitka
131 miles (211 km) SE of Buldir Is
208 miles (335 km) ESE of Shemya

December 10 at 02:58:46.663 UTC (December 9, 17:58:46.663 AKST), Ml 4.2, 52.12N -167.13W, depth=27.3 km:
A light earthquake was located in FOX ISLANDS, ALEUTIAN ISLANDS.
This earthquake was:
92 miles (148 km) SE of Nikolski
124 miles (199 km) SSW of Unalaska
125 miles (201 km) SSW of Dutch Harbor

December 30 at 11:43:16.278 UTC (December 30, 02:43:16.278 AKST), Ml 4.1, 63.80N -149.02W, depth=7.1 km:
A light earthquake was located in CENTRAL ALASKA.
This event was felt in Healy, Cantrell, and Fairbanks.
This earthquake was:
4 miles ( 7 km) SSW of Healy
18 miles ( 29 km) NNW of Denali Park
29 miles ( 46 km) N of Cantwell

December 4 at 23:37:22.748 UTC (December 4, 14:37:22.748 AKST), Ml 4.1, 51.63N -172.65W, depth=20.0 km:
A light earthquake was located in ANDREANOF ISLANDS, ALEUTIAN IS..
This earthquake was:
57 miles ( 92 km) SSW of Amukta Pass
77 miles (123 km) ESE of Atka
172 miles (277 km) E of Adak

December 19 at 00:10:15.019 UTC (December 18, 15:10:15.019 AKST), Ml 4.1, 59.85N -136.74W, depth=2.9 km:
A light earthquake was located in SOUTHEASTERN ALASKA.
This earthquake was:
43 miles ( 69 km) NW of Klukwan
57 miles ( 91 km) WNW of Skagway
62 miles (100 km) NW of Haines

This report was compiled by N.Kozyreva.

The data in this report are preliminary and subject to revision. Most of the earthquake parameters have been determined by the Alaska Earthquake Center, with supplemental data provided by the USGS National Earthquake Information Center, Box 25046, Denver Federal Center MS 967, Denver, CO 80225. The data are released on the condition that none of the cooperating agencies may be held liable for any damages resulting from its authorized or unauthorized use.

For more information on earthquakes and seismology, contact the AEC at (907)-474-7320.