Images

A helicopter overflight the morning of April 9, 2025, at 7 a.m. HST provided views of the episode 17 lava fountaining at the summit of Kīlauea just a few hours before it ended. The lava fountains were supplying lava into a flow that covered much of the Halema‘uma‘u crater floor. The fountains also produced a towering outgassing plume above the summit.

A USGS IT Specialist presents a visualization of volcanic hazards derived via satellite radar systems. IT systems facilitating the swift and accurate production of such solutions will be vital to the success of NVEWS. USGS image. 

Helicopter overflight and a field visit by USGS Hawaiian Volcano Observatory geologists to the crater rim to observe the lava fountaining in episode 17 of the ongoing summit eruption of Kīlauea.

As the day progressed on April 8, despite continued lava fountaining at the south vent (background right), activity declined at the north vent (foreground left). This afternoon photo captured from the western rim of Halemaʻumaʻu crater—looking to the south—shows the north vent's lava pond fully crusted over and sitting lower within the spatter cone.

Following the onset of the Kīlauea summit eruption's seventeenth episode in the late evening of April 7, USGS Hawaiian Volcano Observatory geologists visited the southern rim of Halemaʻumʻau crater on the morning of April 8 to observe vent activity.

Episode 17 of the ongoing Halemaʻumaʻu eruption at the summit of Kīlauea began last night, April 7, with lava flows erupting from the south vent at 10:15 p.m. HST. Low lava fountaining (100 feet, or 30 meters) was active overnight and continues this afternoon, feeding a lava flow on the crater floor.  USGS photo by M. Zoeller. 

In the afternoon of April 8, USGS Hawaiian Volcano Observatory geologists visited the western rim of Halemaʻumaʻu crater to observe the ongoing Kīlauea summit eruption during its seventeenth episode. This telephoto view of the geologists shows them taking laser rangefinder measurements of lava fountains at the active eruptive vent below them within the crater.

This close-up thermal map shows the crater floor at the summit of Kīlauea just an hour after the end of episode 16 lava fountaining on April 2. This map provides a good example of the different zones of lava flow activity on the crater floor that have been observed in many of the eruptive episodes.

This set of thermal maps shows activity near the beginning and just after the end of episode 16 lava fountaining at the summit of Kīlauea. On April 1, lava fountaining was reaching over 200 meters (660 feet) and was beginning to produce a lava flow covering the western portion of the crater floor.

Aerial view of Kaluapele, the summit caldera of Kīlauea, hours after the end of episode 16 of the ongoing eruption in Halemaʻumaʻu. USGS photo by K. Lynn. 

USGS Hawaiian Volcano Observatory geologists captured this view during a monitoring overflight just after noon on April 2, 2025, following the end of episode 16 of the ongoing eruption in Halemaʻumaʻu.

USGS Hawaiian Volcano Observatory geologists landed briefly on the floor of Halemaʻumaʻu crater and captured this image of an active ʻaʻā lava flow. Episode 16 of the ongoing eruption at Kīlaeua summit had ended a couple of hours prior to this photo being taken, and several lava flows retained residual activity at the time of the monitoring overflight.

Episode 16 of the ongoing eruption in Halemaʻumaʻu stopped just after noon today, April 2, 2025. On a USGS Hawaiian Volcano Observatory monitoring overflight within the hours following its end, the crater floor was a patchwork of active and inactive lava flows.

During a monitoring flight on April 2, 2025, USGS Hawaiian Volcano Observatory geologists captured this aerial view of Halemaʻumaʻu, within Kaluapele (Kīlauea summit caldera), just after the end of episode 16 of the ongoing eruption.

During each eruptive episode in Halemaʻumaʻu, tephra is deposited on the crater rim downwind within the closed area of Hawaiʻi Volcanoes National Park. This sign for the Southwest Rift Zone of Kīlauea, which used to stand at least 6 feet (2 meters) above the ground surface, provides a visual for how thick the tephra deposit is at this location. USGS photo by K.

Episode 16 lava fountains were visible from Highway 11 in Kaʻū on April 1. In this view, the top of the lava fountain is just visible above Halemaʻumaʻu crater rim, and Uēkahuna (the highest part of the caldera rim) is visible to the left. USGS photo by K. Mulliken. 

Episode 16 lava fountains deposited tephra and Pele's Hair on Highway 11 in Kaʻū on April 1. In this photo, taken around 3:30 p.m. HST, the tephra and Pele's Hair is visible along the centerline and on the shoulder of the highway. USGS photo by K. Mulliken. 

USGS Hawaiian Volcano Observatory geologist captured this aerial view during a monitoring helicopter overflight of episode 16 at around noon on April 1, 2025.  The lava fountain feeds a lava flow from the western end of Halemaʻumaʻu.

The episode 16 eruption plume was transported north-northwest on April 1, over Highway 11 in Kaʻū. USGS Hawaiian Volcano Observatory volcanic gas specialists traversed under the plume on the highway in order to get a sulfur dioxide emission rate for episode 16.

Wind conditions during episode 16 of the Kīlauea summit eruption resulted in material from the lava fountains being deposited on Highway 11 on April 1. This photo shows the amount of material, including tephra and Pele's Hair, that had accumulated by 3:30 p.m. HST. A Hawaii County Civil Defense Agency message at 12:49 p.m.

Kīlauea summit eruption episode 16 lava fountain and its lava flow on April 1, 2025. The lava fountain was reaching heights of more than 650 ft (200 m) at times and feeding a lava flow that as of noon on April 1 reached about 2,300 ft (700 m) from its vent. The lava fountain was also depositing a tephra blanket to the northwest that was reaching Highway 11.