Ketchikan Gateway Borough School District Natural Disasters and Weather Extremes
The chance of earthquake damage in Ketchikan Gateway Borough School District is much lower than Alaska average and is much lower than the national average. The risk of tornado damage in Ketchikan Gateway Borough School District is about the same as Alaska average and is much lower than the national average.
Earthquake Index, #51
| Ketchikan Gateway Borough School District | 0.00 |
| 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, #7
| Ketchikan Gateway Borough School District | 0.0280 |
| 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, #3
| Ketchikan Gateway Borough School District | 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 Ketchikan Gateway Borough School District 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 6 volcanoes are found in or near Ketchikan Gateway Borough School District.
| Distance (miles) | Name | Region | Latitude | Longitude | Elevation (foot) | Type | Status | Last Eruption |
| 17.2 | Behm Canal-Rudyerd Bay | Alaska-SE, United States | 55.32 | -131.05 | 500 | Cinder cone | Holocene | Unknown |
| 68.1 | Crow Lagoon | Canada, Canada | 54.7 | -130.23 | 335 | Pyroclastic cone | Holocene | Undated, but probable Holocene eruption |
| 72.2 | Tlevak Strait-Suemez Is. | Alaska-SE, United States | 55.25 | -133.3 | 50 | Volcanic field | Holocene | Undated, but probable Holocene eruption |
| 90.2 | Iskut-Unuk River Cones | Canada, Canada | 56.58 | -130.55 | 1880 | Cinder cone | Radiocarbon | Last known eruption 1800-1899 |
| 97.0 | Hoodoo Mountain | Canada, Canada | 56.78 | -131.28 | 1820 | Subglacial volcano | Holocene | Undated, but probable Holocene eruption |
| 99.6 | Duncan Canal | Alaska-SE, United States | 56.5 | -133.1 | 15 | Unknown | Holocene | Undated, but probable Holocene eruption |
Historical Earthquake Events
No historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Ketchikan Gateway Borough School District.
No historical earthquake events found in or near Ketchikan Gateway Borough School District.
Historical Tornado Events
No historical tornado events that had recorded magnitudes of 2 or above found in or near Ketchikan Gateway Borough School District.
No historical earthquake events found in or near Ketchikan Gateway Borough School District.
* 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.