Kilauea is one of the most active volcanoes on Earth, and yes, it poses real dangers. As of early 2026, the USGS has Kilauea at a WATCH alert level with an ORANGE aviation color code, meaning the volcano is actively erupting. But the risks go well beyond lava. Earthquakes, toxic air, explosive blasts, and even tsunamis are all part of the hazard profile for this volcano and the communities around it.
That said, the type of danger depends entirely on where you are and what the volcano is doing at any given time. Here’s what each risk actually looks like.
Lava Flows Are the Most Visible Threat
Kilauea’s lava flows are slow-moving enough that they rarely kill people directly, but they can erase entire neighborhoods. During the 2018 eruption on the lower east rift zone, lava inundated 14 square miles of land and destroyed 1,839 structures. Homes, roads, and utilities were buried under rock that will take decades to clear, if it ever is.
The USGS divides the Big Island into nine lava flow hazard zones. Zone 1, which covers Kilauea’s summit and rift zones, is the most dangerous because that’s where lava first breaks the surface. Zone 2, immediately downslope of the rift zones, faces high risk as well since lava naturally flows downhill from Zone 1. Some residential subdivisions, including parts of lower Puna, sit squarely in these high-hazard areas. There’s no state law requiring the hazard zone map to be used in land-use decisions, though insurance companies and mortgage lenders sometimes factor it in.
Volcanic Air Pollution Is a Chronic Health Risk
When Kilauea is erupting, it releases large quantities of sulfur dioxide that react with sunlight, oxygen, and moisture to form volcanic smog, locally called “vog.” This hazy air can blanket the western side of the Big Island and drift to neighboring islands for weeks or months at a time.
During a period of increased volcanic emissions in 2008, when ambient sulfur dioxide levels averaged 75 parts per billion (roughly three times higher than the preceding weeks), researchers found significant increases in medical visits for cough, headache, sore throat, and acute airway problems. The airway effects were especially severe among young Pacific Islanders, who had more than six times the odds of visiting a clinic for breathing problems compared to low-exposure periods. People with asthma or other respiratory conditions are particularly vulnerable, and vog episodes can persist for the entire duration of an active eruption.
Earthquakes Under Kilauea Can Be Severe
Kilauea doesn’t just produce lava. The movement of magma through underground chambers and rift zones generates constant seismic activity, and the volcano sits on geologically unstable ground. The south flank of the island is being compressed and pushed laterally by rift zone intrusions, and this creates conditions for large tectonic earthquakes that can reach magnitude 8.
The numbers paint a clear picture of how often this happens. Magnitude 5.5 or greater earthquakes occur roughly every 3 to 5 years in south Hawaii. Magnitude 7 events happen every 29 to 44 years on average. Magnitude 8 quakes, the most destructive, have a recurrence interval of roughly 120 to 190 years. According to USGS seismic hazard maps, the peak ground acceleration on Kilauea’s mobile south flank is comparable to what you’d find near the San Andreas Fault in California. For residents, that means real structural risk to buildings, roads, and infrastructure.
Explosive Eruptions Are Rare but Possible
Most people picture Kilauea as a gently oozing volcano, but it has a history of violent explosive eruptions. The most notable modern example occurred in 1924, when a rapid draining of the summit lava lake lowered the magma column enough that groundwater rushed into superheated rock beneath the crater. The resulting steam explosions hurled boulders weighing several tons out of Halemaumau crater.
This type of event, called a phreatic eruption, requires a specific combination of conditions: a large volume of magma must drain from the summit reservoir, and magma near the surface must be removed quickly enough to allow groundwater contact with extremely hot rock. Neither condition alone is sufficient. Large magma transfers happened in 1955 and 1960 without any explosion, and the lava lake drained in 1922 and 1923 without triggering steam blasts. It takes both factors together. This makes explosive events at Kilauea uncommon, but when the conditions align, the results can be lethal within a mile or more of the summit.
Flank Collapse and Tsunami Risk
Perhaps the least appreciated danger is the slow seaward movement of Kilauea’s south flank, a massive block of rock known as the Hilina Slump. This flank is gradually sliding toward the ocean, and when it moves suddenly, it generates tsunamis.
In 1975, a magnitude 7.2 earthquake caused a 40-kilometer segment of the south coast to drop 3.5 meters almost instantly. The resulting tsunami reached heights of 12 to 15 meters and killed two people who were camped near the shore. A full catastrophic flank collapse, where a large section breaks away entirely, is far less likely. Geological evidence suggests events like that happen only once every 100,000 to 200,000 years across the Hawaiian island chain. But smaller, more frequent displacements like the 1975 event actually pose a greater cumulative risk to coastal populations. Tsunamis generated by flank movement are, in fact, a bigger threat to human life than lava flows, which tend to destroy property but move slowly enough for evacuation.
Hazards for Visitors at the National Park
Hawaii Volcanoes National Park draws millions of visitors, and the terrain itself is a hazard. Hardened lava fields are uneven, razor-sharp, and deceptively fragile in places. Hundreds of mechanical injuries occur each year in the park, including lacerations, fractures, sprains, and abrasions from falls on rough lava surfaces. Walking on lava at night is especially risky. One visitor died in the late 1980s after falling on uneven lava while hiking back to his car from a flow front after dark.
Lava benches, the platforms of new land formed where lava enters the ocean, are another serious hazard. They look solid but are structurally unstable and can collapse without warning into the sea. A photographer died in 1993 when a bench gave way beneath him. Ground cracks, some hidden by vegetation, and pockets of volcanic gas near vents add to the risks. Staying on marked trails and obeying park closures eliminates most of these dangers, but the environment is genuinely unforgiving if you venture off designated paths.
How Kilauea Is Monitored
Kilauea is one of the most closely watched volcanoes in the world. The USGS Hawaiian Volcano Observatory operates a network of 25 instruments on and around the volcano, including 8 seismometers to detect earthquakes and tremor, 4 GPS stations that track ground deformation down to millimeters, 3 gas monitoring stations that measure sulfur dioxide output, 2 tiltmeters that detect swelling or deflation of the summit, and 8 cameras providing continuous visual monitoring. During the February 2026 eruption, observatory updates were being issued multiple times per day, tracking fountain heights (which reached over 500 feet), lava volumes exceeding 10 million cubic yards, and tiltmeter deflation readings in real time.
This monitoring network gives scientists hours to days of warning before most eruptions begin, based on patterns of increasing earthquake activity, ground swelling, and gas emissions. It doesn’t make eruptions predictable in a precise sense, but it means residents and visitors typically have time to respond before lava reaches populated areas.