Lava Flow Hazard Zones
The below map shows lava-flow hazard zones for the five volcanoes on the Island of Hawaiʻi:
- Kīlauea (active, last eruption: 2018)
- Mauna Loa (active, last eruption: 1984)
- Hualalai (active, last eruption: 1801)
- Mauna Kea (dormant)
- Kohala (extinct)
Volcano boundaries are shown as heavy, dark bands, reflecting the overlapping of lava flows from adjacent volcanoes along their common boundary. Hazard-zone boundaries are drawn as double lines because of the geologic uncertainty in their placement.
Lava-flow hazard zones - Based on location of eruptive vents, past lava coverage, and topography
- Zone 1: Includes summits and rift zones of Kīlauea and Mauna Loa, where vents have been repeatedly active in historical time.
- Zone 2: Areas adjacent to and downslope of zone 1. In Zone 2, 15% to 25% of land has been covered by lava since 1800, and 25% to 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 (or) because of topography. In Zone 3, 1% to 5% of land has been covered since 1800, and 15% to 75% has been covered within the past 750 years.
- Zone 4: Includes all of Hualālai, where the frequency of eruptions is lower than that for Kīlauea 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 Kīlauea currently protected by topography.
- Zone 6: Two areas on Mauna Loa, both protected by topography.
- Zone 7: Younger part of domant volcano Mauna Kea. In this area, 25% of land was covered by lava in the past 10,000 years.
- Zone 8: Remaining part of Mauna Kea. Only a few percent of this area has been covered by lava in the past 10,000 years.
- Zone 9: Kohala Volcano, which last erupted more than 60,000 years ago.
Kīlauea Eruption Risk Assessment (KERA)
The Pacific Disaster Center prepared the Kīlauea Eruption Risk Assessment for Hawai‘i County as an in-kind service following the 2018 Kīlauea eruption.
The document identifies both volcanic multi-hazard exposure and vulnerabilities – such as access to transportation, socioeconomic status and household composition – for residents in or around lava zones 1 and 2 on Kīlauea and Mauna Loa.
The KERA will be followed by a more detailed volcanic risk assessment with results organized by Community Development Plan districts.
The island-wide volcanic risk assessment will examine the exposure of people, property, critical facilities/lifelines, environmental resources and cultural assets to the volcanic hazard. These results will then be used to inform the update to the County General Plan, County Multi-Hazard Mitigation Plan and Kīlauea Recovery Strategic Plan.