Kīlauea, the most active of Hawaii’s volcanoes, has erupted dozens of times since Western observers began keeping records in the early 1800s, and it spent 35 nearly continuous years erupting from a single vent between 1983 and 2018. Mauna Loa, its massive neighbor, averages an eruption roughly every five to six years over its recorded history, though gaps of a decade or more are common. Beyond these two headline volcanoes, eruption frequency drops steeply: Hualālai last erupted in 1801, Haleakalā on Maui has not erupted in several centuries, and the older islands in the chain are considered extinct. The picture that emerges is not a single “Hawaii eruption rate” but a spectrum shaped by each volcano’s age, plumbing, and position over the hotspot that feeds them all.
Kīlauea’s Relentless Pace
Kīlauea is one of the most active volcanoes on Earth by almost any measure. Its historical record stretches back to at least 1823, when the first European visitors reached the summit and were told stories by Native Hawaiians describing centuries of prior activity. Since then, eruptions have come in rapid succession, sometimes overlapping. The most striking modern example was the Puʻu ʻŌʻō eruption on the middle East Rift Zone, which started in 1983 and continued with only brief pauses until the dramatic 2018 lower East Rift Zone event shut it down.1Nature Communications. The cascading origin of the 2018 Kīlauea eruption and implications for future forecasting That 35-year run poured out enough lava to cover tens of square kilometers and added new land to the island’s coastline.
Even when Kīlauea is not in a decades-long eruption, quiet spells tend to be short. Statistical analysis of its historical record shows that eruptions behave as largely random events with no clear periodic cycle. Large-volume eruptions tend to be followed by somewhat longer rest periods as the shallow magma reservoir refills, but small eruptions can follow one another in quick succession.2Journal of Volcanology and Geothermal Research. Patterns of historical eruptions at Hawaiian volcanoes The practical upshot is that predicting exactly when Kīlauea’s next eruption will start is extremely difficult, but the odds of it staying quiet for more than a few years at a stretch are historically low.
Mauna Loa and the Alternating Supply
Mauna Loa, the world’s largest active volcano by volume, erupts less often than Kīlauea but still frequently by global standards. Over its recorded history it has averaged an eruption roughly every five to six years, though there was a notable 38-year pause between 1984 and its most recent eruption in late 2022. That long silence made the 2022 event front-page news, but Mauna Loa’s historical record includes several quiet stretches of a decade or more, so the gap was unusual but not unprecedented.
One of the more interesting findings from the historical record is that Kīlauea and Mauna Loa appear to trade off. When one volcano is particularly active, the other tends to be quieter. The longest recorded rest periods for each volcano line up with bursts of activity at the other, suggesting the two share a deep magma source that splits its output between them. Analysis of eruption rates and volumes is consistent with a roughly constant but alternating magma supply and a magma reservoir beneath Mauna Loa about five times larger than Kīlauea’s.2Journal of Volcanology and Geothermal Research. Patterns of historical eruptions at Hawaiian volcanoes That larger reservoir helps explain why Mauna Loa eruptions, though less frequent, tend to produce bigger lava flows.
How Magma Supply Controls the Pace
The engine behind all Hawaiian volcanism is a plume of unusually hot rock rising from deep in the Earth’s mantle beneath the Pacific Plate. As the plate creeps northwest at a few inches per year, each volcano eventually drifts off the hotspot and its magma supply dwindles. But even for a volcano sitting squarely over the plume, the supply is not perfectly steady.
During sustained eruptions at Kīlauea, magma moves from a deep source through the volcano’s plumbing at a rate of about 0.09 cubic kilometers per year. At other times the supply fluctuates. After a large rift-zone eruption drains the summit reservoir, the refilling rate initially spikes and then tapers off. Measurements from several refilling episodes in the 1960s showed annual supply rates ranging from 0.02 to 0.18 cubic kilometers, bracketing that long-term average.3Journal of Geophysical Research: Solid Earth. Variations in magma supply rate at Kilauea Volcano, Hawaii Those swings matter because a faster refill means pressure builds sooner, which can trigger the next eruption earlier than expected.
Supply can also surge over longer timescales. Between 2003 and 2007, the magma flowing into Kīlauea at least doubled, bringing dramatic changes in eruptive behavior and new vents. Rising carbon dioxide emissions pointed to a mantle-level cause rather than something happening in the volcano’s shallow plumbing. The finding suggests the hotspot itself can pulse over periods of just a few years, not only over millions.4Nature Geoscience. A mantle-driven surge in magma supply to Kīlauea Volcano during 2003–2007 For eruption frequency, this means the tempo can shift faster than the long-term averages imply.
Can Eruption Timing Be Predicted?
Researchers have tested several models to see if Hawaiian eruption intervals follow predictable patterns. One approach asks whether the time until the next eruption is proportional to the size of the last one (the “time-predictable” model). Another asks whether the size of the next eruption is proportional to how long the volcano has been resting (the “size-predictable” model).5Journal of Geophysical Research: Solid Earth. A quantitative model for the time‐size distribution of eruptions Both models capture some real tendencies: bigger eruptions do tend to be followed by longer pauses, for instance. But overall, the eruption sequence at Kīlauea and Mauna Loa looks statistically close to random, with multiple overlapping processes governing timing so that no simple clock emerges.2Journal of Volcanology and Geothermal Research. Patterns of historical eruptions at Hawaiian volcanoes
What scientists can do is watch for precursors. Kīlauea’s summit undergoes episodic deflation-inflation cycles, where the ground surface sinks over hours to days as magma drains out, then rapidly reinflates as fresh magma arrives.6Journal of Volcanology and Geothermal Research. Implications of deflation-inflation event models on Kīlauea Volcano, Hawaiʻi Changes in the rhythm or amplitude of these cycles, along with earthquake swarms and gas emission spikes, give the Hawaiian Volcano Observatory hours to days of warning before most eruptions. That is not the same as predicting the date of the next eruption months in advance, but it is enough to issue alerts and evacuate if needed.
Satellite-based radar has added another layer. Measurements taken from orbit can detect centimeter-scale ground deformation across entire volcanic flanks. Early shuttle radar observations of Kīlauea in 1994 picked up deflation signals around the Puʻu ʻŌʻō vent spanning several kilometers.7Journal of Geophysical Research: Planets. Surface deformation and coherence measurements of Kilauea Volcano, Hawaii, from SIR‐C radar interferometry Modern satellite radar revisits the volcano far more frequently, creating a near-continuous map of where magma is accumulating underground and where the surface is subsiding.
The Less Active Volcanoes
Hawaii’s two most active volcanoes get most of the attention, but the island chain includes several others in various stages of winding down. On the Big Island itself, Hualālai last erupted in 1801 and is considered dormant rather than extinct; geologists expect it will erupt again, though possibly not for decades or centuries. Mauna Kea, also on the Big Island, last erupted roughly 4,500 years ago and is in a late postshield or possibly early quiescent phase.
Over on Maui, Haleakalā is the youngest volcano on an older island. Mapping and radiocarbon dating of its lava flows show that it has been erupting at a nearly constant rate for the past 13,000 years, producing between 0.05 and 0.15 cubic kilometers of lava per thousand years. That is roughly half the long-term rate seen during its earlier postshield period.8Journal of Geophysical Research: Solid Earth. Distribution, 14C chronology, and paleomagnetism of latest Pleistocene and Holocene lava flows at Haleakalā volcano, Island of Maui, Hawai’i: A revision of lava flow hazard zones The eruption frequency is similar to that of Hualālai, meaning an eruption every few hundred to a few thousand years. Haleakalā’s last eruption is estimated to have occurred sometime between the late 1400s and the early 1600s. It is definitely not extinct, but a visitor standing in its crater on any given day faces vanishingly small odds of seeing lava.
The Volcano Life Cycle
Every Hawaiian volcano goes through a predictable life arc as the Pacific Plate carries it away from the hotspot. During the shield stage, the volcano is directly over or near the plume and erupts prodigiously, building up roughly 80 to 95 percent of its total volume in fluid lava flows. Eventually, the volcano drifts far enough that the supply drops by about a factor of ten, and it enters the postshield stage, where eruptions become less frequent and the lava chemistry shifts.9U.S. Geological Survey Professional Paper. Growth and degradation of Hawaiian volcanoes
After the postshield stage, most volcanoes go quiet entirely for hundreds of thousands to millions of years. But some experience a surprise encore. Five Hawaiian volcanoes have undergone what geologists call rejuvenated-stage volcanism, where small eruptions resume after quiet periods ranging from about half a million to two million years.9U.S. Geological Survey Professional Paper. Growth and degradation of Hawaiian volcanoes These rejuvenated eruptions produce distinctive alkalic lavas and are typically small, but they can last long enough to build recognizable features. Diamond Head and Hanauma Bay on Oahu are products of rejuvenated volcanism that occurred long after the main shield-building phase ended. The eruptions that formed them were brief geologically, perhaps single events or short clusters, but they happened well after the island had been “done” by normal accounting.
This life cycle explains why eruption frequency varies so dramatically across the island chain. Kīlauea and Mauna Loa are in the shield stage and erupt constantly. Hualālai and Haleakalā are in late postshield or early quiescent phases and erupt every few centuries. The volcanoes on Oahu, Kauai, and the islands farther northwest are either extinct or capable of only sporadic rejuvenated activity separated by immense stretches of quiet. Drilling into Kīlauea’s flank has revealed an accumulation rate of about 4.4 meters of lava per thousand years over its history, a pace that may have increased in the most recent 50,000 years.10Geology. How old is Kīlauea Volcano (Hawai’i)? Insights from 40Ar/39Ar dating of the 1.7-km-deep SOH-1 core Compare that relentless buildup to the trickle at Haleakalā and the picture is clear: proximity to the hotspot is everything.
When Islands Stop Erupting for Good
Eventually every Hawaiian volcano drifts far enough from the hotspot that eruptions cease entirely. The island then begins to erode and subside. Research into the lifespan of volcanic ocean islands found that islands generally drown, slipping below sea level, when they migrate off the broad topographic swell created by the hotspot. For Hawaii, which sits on a relatively fast-moving plate, that swell residence time is on the order of ten million years or so.11PubMed Central. Hotspot swells and the lifespan of volcanic ocean islands The agreement between swell residence times and actual island lifespans across multiple hotspot chains suggests this is a general rule, not a coincidence. Northwest of the main Hawaiian Islands, the Emperor Seamount chain is the drowned graveyard of volcanoes that went through this same cycle tens of millions of years ago.
Over even longer timescales, the Hawaiian hotspot itself has not been perfectly steady. Volume calculations spanning the last 30 million years show a general increase in hot spot activity, with shorter oscillations on a roughly five-million-year cycle that may reflect internal dynamics of the mantle plume.12Journal of Geophysical Research: Solid Earth. Variations of the Hawaiian hot spot activity revealed by variations in the magma production rate That means the current era of vigorous volcanism on the Big Island is not necessarily representative of the hotspot’s entire history. The plume has had quieter periods and busier ones, and the eruption rates at any given time reflect not just a volcano’s position but also the plume’s mood, so to speak.
Lōʻihi, the Youngest Volcano
About 30 kilometers off the southeast coast of the Big Island, a submarine volcano named Lōʻihi Seamount is building itself up from the ocean floor. Its summit is still roughly 1,000 meters below the surface, so its eruptions go unseen by anyone on land. But Lōʻihi is the newest expression of the Hawaiian hotspot and will, given a few tens of thousands of years, eventually break the surface and become the next Hawaiian island.
Lōʻihi’s eruptions are not just gentle oozes of lava on the seafloor. Studies of scoria deposits on its northern cone show that explosive eruptions can occur even at great ocean depth when gas-rich magma undergoes a specific style of degassing that lets dissolved gases reinforce each other, driving the magma to high enough internal pressures to fragment violently.13Earth and Planetary Science Letters. Explosive submarine eruptions driven by volatile-coupled degassing at Lō`ihi Seamount, Hawai`i Seismic swarms detected from Lōʻihi in 1996 were intense enough to confirm that it is very much an active volcano, not just a warm bump on the seafloor. How often it erupts is poorly constrained because monitoring a deep submarine volcano is far harder than watching Kīlauea, but its position over the hotspot suggests it is in an early shield-building phase and likely erupts frequently by geological standards.
Hawaiian Oral Traditions as Eruption Records
The written record of Hawaiian eruptions only goes back to the 1820s, but the volcanic history extends much further thanks to Native Hawaiian oral traditions. Chants and stories involving Pele, the volcano deity, and her sister Hiʻiaka preserve descriptions of volcanic events that geologists have been able to match with physical evidence in the rock record. The two largest volcanic events since human settlement of Hawaii appear to be encoded in these traditions: a roughly 60-year-long eruption called ʻAilāʻau that blanketed large areas of Kīlauea’s north flank in the 15th century, and the subsequent collapse that formed Kīlauea’s summit caldera.14Journal of Volcanology and Geothermal Research. Hawaiian oral tradition describes 400 years of volcanic activity at Kīlauea
When the first European visitors arrived at Kīlauea’s summit in 1823, local Hawaiians shared accounts of the volcano’s behavior stretching back through the 18th century that are consistent with the Pele-Hiʻiaka narrative and with geological evidence. These oral records effectively extend the eruption chronology by about 400 years, filling in a gap that would otherwise be covered only by radiocarbon dating and lava-flow mapping. The consistency between the stories and the geology underscores that Hawaiian volcanoes have been erupting at a brisk pace for as long as anyone has been around to watch.
For Kīlauea in particular, the combined oral and written record paints a picture of a volcano that rarely takes a long break. The ʻAilāʻau eruption alone lasted decades, and the centuries since have been punctuated by frequent summit and rift-zone activity. Even the eruptions along Kīlauea’s lower East Rift Zone, which tend to be rarer than summit events, have occurred at least four times since the late 1700s, with each one producing substantial lava volumes.1Nature Communications. The cascading origin of the 2018 Kīlauea eruption and implications for future forecasting The 2018 eruption, which destroyed over 700 homes in the Leilani Estates subdivision, was the latest in that sequence and a reminder that infrequent does not mean unlikely on human timescales.