Lava-flow hazard zones

USGS Lava Hazard Zone definitions

• Zone 1 - Includes summits and rift zones of Kilauea and Mauna Loa volcanoes, where vents have been repeatedly active in historical time.
• Zone 2 - Areas adjacent to and downslope of zone 1. 15-25% of zone 2 has been covered by lava since 1800, and 25-75% has been covered within the past 750 years. Relative hazard within zone 2 decreases gradually as one moves away from zone 1.
• Zone 3 - Areas less hazardous than zone 2 because of greater distance from recently active vents and because of topography. 1-5% of zone 3 has been covered since 1800, and 15-75% has been covered within the past 750 years.
• Zone 4 - Includes all of Hualalai, where the frequency of eruptions is lower than that for Kilauea or Mauna Loa. Lava coverage is proportionally smaller, about 5% since 1800, and less than 15% within the past 750 years.
• Zone 5 - Area on Kilauea currently protected by topography
• Zone 6 - Two areas on Mauna Loa, both protected by topography
• Zone 7 - Younger part of Mauna Kea volcano. 20% of this area was covered by lava in the past 10,000 years.
• Zone 8 - Remaining part of Mauna Kea. Only a few percents of this area has been covered by lava in the past 10,000 years.
• Zone 9 - Kohala Volcano, which last erupted over 60,000 years ago.