05-22-2016, 06:04 PM
Why would they change? If you are at the vents (along the rift zones - Leilani/Kapoho) you're in zone 1. If you are in an area immediately adjacent to the vents (Pahoa/all points south of the East Rift Zone) you're in 2. If you are in an area that lava flows will inundate during a long lived eruption (HPP and all the other Puna subdivisions) you're in zone 3.
More precisely (from HVO's website at http://hvo.wr.usgs.gov/hazards/lavazones/main.html):
• Zone 1: Includes the summits and rift zones of Kilauea and Mauna Loa where vents have been repeatedly active in historic time.
• Zone 2: Areas adjacent to and downslope of active rift zones.
• Zone 3: Areas gradationally less hazardous than Zone 2 because of greater distance from recently active vents and/or because the topography makes it less likely that flows will cover these areas.
• Zone 4: Includes all of Hualalai, where the frequency of eruptions is lower than on Kilauea and Mauna Loa. Flows typically cover large areas.
• Zone 5: Areas currently protected from lava flows by the topography of the volcano.
• Zone 6: Same as Zone 5.
• Zone 7: 20 percent of this area covered by lava in the last 10,000 yrs.
• Zone 8: Only a few percent of this area covered in the past 10,000 yrs.
• Zone 9: No eruption in this area for the past 60,000 yrs.
A good map is at: https://en.wikipedia.org/wiki/Lava_Flow_...rd_Map.png
More precisely (from HVO's website at http://hvo.wr.usgs.gov/hazards/lavazones/main.html):
• Zone 1: Includes the summits and rift zones of Kilauea and Mauna Loa where vents have been repeatedly active in historic time.
• Zone 2: Areas adjacent to and downslope of active rift zones.
• Zone 3: Areas gradationally less hazardous than Zone 2 because of greater distance from recently active vents and/or because the topography makes it less likely that flows will cover these areas.
• Zone 4: Includes all of Hualalai, where the frequency of eruptions is lower than on Kilauea and Mauna Loa. Flows typically cover large areas.
• Zone 5: Areas currently protected from lava flows by the topography of the volcano.
• Zone 6: Same as Zone 5.
• Zone 7: 20 percent of this area covered by lava in the last 10,000 yrs.
• Zone 8: Only a few percent of this area covered in the past 10,000 yrs.
• Zone 9: No eruption in this area for the past 60,000 yrs.
A good map is at: https://en.wikipedia.org/wiki/Lava_Flow_...rd_Map.png