USA.com / Alaska / Anchorage County / Natural Disasters and Weather Extremes

Anchorage County Natural Disasters and Weather Extremes

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The chance of earthquake damage in Anchorage County is much higher than Alaska average and is much higher than the national average. The risk of tornado damage in Anchorage County is about the same as Alaska average and is much lower than the national average.

Topics:Earthquake Index Volcano Index Tornado Index Other Weather Extremes Events Volcanos Nearby Historical Earthquake Events Historical Tornado Events

Earthquake Index, #3

Anchorage County	6.68
Alaska	3.28
U.S.	1.81

The earthquake index value is calculated based on historical earthquake events data using USA.com algorithms. It is an indicator of the earthquake level in a region. A higher earthquake index value means a higher chance of an earthquake.

Volcano Index, #16

Anchorage County	0.0024
Alaska	0.0226
U.S.	0.0023

The volcano index value is calculated based on the currently known volcanoes using USA.com algorithms. It is an indicator of the possibility of a region being affected by a possible volcano eruption. A higher volcano index value means a higher chance of being affected.

Tornado Index, #4

Anchorage County	0.00
Alaska	0.01
U.S.	136.45

The tornado index value is calculated based on historical tornado events data using USA.com algorithms. It is an indicator of the tornado level in a region. A higher tornado index value means a higher chance of tornado events.

Other Weather Extremes Events

A total of 11 other weather extremes events within 50 miles of Anchorage County were recorded from 1950 to 2010. The following is a break down of these events:

Type	Count	Type	Count	Type	Count	Type	Count	Type	Count
Avalanche:	0	Blizzard:	0	Cold:	0	Dense Fog:	0	Drought:	0
Dust Storm:	0	Flood:	3	Hail:	5	Heat:	0	Heavy Snow:	0
High Surf:	0	Hurricane:	0	Ice Storm:	0	Landslide:	0	Strong Wind:	0
Thunderstorm Winds:	0	Tropical Storm:	0	Wildfire:	2	Winter Storm:	0	Winter Weather:	0
Other:	1

Volcanos Nearby

A total of 6 volcanoes are found in or near Anchorage County.

Distance (miles)	Name	Region	Latitude	Longitude	Elevation (foot)	Type	Status	Last Eruption
432.9	Aniakchak	Alaska Peninsula, United States	56.88	-158.17	1341	Caldera	Historical	Last known eruption 1900-1963
466.8	Black Peak	Alaska Peninsula, United States	56.53	-158.8	1032	Stratovolcano	Radiocarbon	Last known eruption B.C. (Holocene)
500.1	Veniaminof	Alaska Peninsula, United States	56.17	-159.38	2507	Stratovolcano	Historical	Last known eruption 1964 or later
518.7	Kupreanof	Alaska Peninsula, United States	56.02	-159.8	1895	Stratovolcano	Historical	Last known eruption 1964 or later
528.5	Unnamed	Alaska Peninsula, United States	55.93	-160	1555	Cinder cone	Holocene	Undated, but probable Holocene eruption
576.4	Dana	Alaska Peninsula, United States	55.62	-161.22	1354	Stratovolcano	Radiocarbon	Last known eruption B.C. (Holocene)

Historical Earthquake Events

A total of 56 historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Anchorage County.

Distance (miles)	Date	Magnitude	Depth (km)	Latitude	Longitude
39.9	1909-09-19	7.4	N/A	60.6	-149.3
47.7	1911-09-22	6.9	60	60.5	-149
27.1	1951-06-25	6.3	128	61	-150
18.8	1965-05-11	5.8	58	61.4	-149.6
39.9	1966-10-07	5.7	56	61.6	-150.1
47.5	1984-08-14	5.7	20	61.86	-149.1
30.9	1931-01-27	5.6	N/A	60.75	-149
44.3	1966-09-01	5.2	77	61.8	-149.6
26.1	1977-04-12	5.1	39	60.8	-149.22
30.5	1979-11-14	5.1	57	61.38	-150.09
18.8	1978-01-06	4.9	45	60.91	-149.38
16.6	1982-05-05	4.8	63	61.25	-149.75
40.9	1984-03-14	4.8	67	61.7	-149.86
47.1	1983-10-14	4.8	38	61.85	-149.52
45.9	1970-07-30	4.7	24	60.6	-148.6
15.6	1964-04-16	4.6	30	61.4	-149.2
22.5	1984-09-29	4.6	62	61	-149.84
35.7	1981-05-05	4.4	64	61.66	-149.66
12.8	1982-07-10	4.3	59	61.17	-149.66
42.1	1984-08-14	4.2	24	61.77	-148.97
25.5	1966-01-18	4.1	46	61.5	-148.9
31.5	1964-04-14	4.1	N/A	61.57	-149.76
37.8	1964-09-23	4.1	33	61.6	-150
14.2	1979-03-14	4	41	60.98	-149.39
17.6	1969-05-14	3.9	40	61.2	-149.8
21.1	1984-02-26	3.9	43	61.38	-149.75
23.2	1964-09-13	3.9	33	61.4	-149.8
32.5	1983-04-22	3.9	72	61.49	-150.01
42.3	1984-04-15	3.9	63	60.68	-148.54
4.6	1985-10-05	3.8	44	61.24	-149.23
22.3	1966-12-16	3.8	65	61.5	-149.3
22.6	1970-07-04	3.8	40	61.5	-149.4
24.8	1979-11-15	3.8	49	61.26	-150
31.1	1970-12-28	3.8	47	61.6	-149.6
31.1	1983-04-10	3.8	52	61.48	-149.97
34.7	1985-02-17	3.8	39	61.62	-149.77
44.6	1984-01-03	3.8	62	61.74	-149.94
45.7	1965-07-15	3.8	64	61.8	-148.8
46.3	1971-06-17	3.8	65	61.8	-149.8
26.8	1968-09-24	3.7	50	61.44	-149.87
31.4	1971-04-02	3.7	47	61.4	-150.1
40.7	1980-07-05	3.7	49	61.61	-150.11
43.1	1984-08-14	3.7	15	61.78	-148.93
43.3	1970-05-10	3.7	55	61.7	-150
7.7	1973-04-06	3.6	39	61.2	-149.5
15.4	1979-01-27	3.6	49	60.96	-149.38
39.2	1983-05-15	3.6	54	61.65	-149.93
42.4	1985-11-14	3.6	7	61.67	-150.04
4.5	1972-02-25	3.5	45	61.2	-149.4
23.0	1978-07-13	3.5	40	61.11	-149.95
25.2	1984-03-07	3.5	33	61.06	-148.56
25.2	1985-11-20	3.5	40	61.47	-149.73
27.5	1977-01-25	3.5	37	60.98	-149.99
43.7	1983-08-19	3.5	25	60.64	-149.96
44.1	1985-08-07	3.5	13	61.79	-148.89
45.8	1983-09-16	3.5	63	60.57	-149.82

Historical Tornado Events

No historical tornado events that had recorded magnitudes of 2 or above found in or near Anchorage County.

No historical earthquake events found in or near Anchorage County.

* The information on this page is based on the global volcano database, the U.S. earthquake database of 1638-1985, and the U.S. Tornado and Weather Extremes database of 1950-2010.