Sitka County Natural Disasters and Weather Extremes
The chance of earthquake damage in Sitka County is much lower than Alaska average and is lower than the national average. The risk of tornado damage in Sitka County is about the same as Alaska average and is much lower than the national average.
Earthquake Index, #16
| Sitka County | 0.53 |
| 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, #11
| Sitka County | 0.0078 |
| 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
| Sitka 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 0 other weather extremes events within 50 miles of Sitka 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: | 0 | Hail: | 0 | 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: | 0 | Winter Storm: | 0 | Winter Weather: | 0 |
| Other: | 0 | ||||||||
Volcanos Nearby
A total of 3 volcanoes are found in or near Sitka County.
| Distance (miles) | Name | Region | Latitude | Longitude | Elevation (foot) | Type | Status | Last Eruption |
| 16.9 | Edgecumbe | Alaska-SE, United States | 57.05 | -135.75 | 976 | Stratovolcano | Radiocarbon | Last known eruption B.C. (Holocene) |
| 95.3 | Duncan Canal | Alaska-SE, United States | 56.5 | -133.1 | 15 | Unknown | Holocene | Undated, but probable Holocene eruption |
| 152.2 | Tlevak Strait-Suemez Is. | Alaska-SE, United States | 55.25 | -133.3 | 50 | Volcanic field | Holocene | Undated, but probable Holocene eruption |
Historical Earthquake Events
A total of 3 historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Sitka County.
| Distance (miles) | Date | Magnitude | Depth (km) | Latitude | Longitude |
| 25.8 | 1972-07-30 | 7.6 | 25 | 56.82 | -135.68 |
| 37.5 | 1966-03-25 | 4.7 | 22 | 56.6 | -135.4 |
| 32.8 | 1963-07-08 | 3.7 | 28 | 57 | -134.5 |
Historical Tornado Events
No historical tornado events that had recorded magnitudes of 2 or above found in or near Sitka County.
No historical earthquake events found in or near Sitka 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.