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Today’s quakes near the eruption site (oldest in green, latest in red)

The eruption north of Grindavík has decreased a lot or even paused,with little activity visible on webcams and recent drone flights.

However, seismic activity continues. Seismic activity has subsided in the southern part of the magma tunnel, near Grindavík, but activity at the northern end of the magma tunnel continues at a similar intensity and has moved even further north in recent hours. This includes a magnitude 5 quake 6 km east of Vogar at 16.54 local time, which was felt widely in the area.
The seismic activity is now almost 9 km north of the northernmost fissure in this eruption sequence that formed in August 2024. The largest earthquakes have been about magnitude 3 and are clearly felt in Vogar, which is about 7 km NW of the activity.

Deformation measurements show that magma is still flowing from Svartsengi into the magma tunnel on the Sundhnúksgígar series. The seismic activity indicates that the magma is moving northeast. The seismic activity is at a depth of about 4-6 km and work is underway to analyze deformation data in that area. While seismic activity is still considerable and deformation is still being measured, the possibility of magma re-emerging at the Sundhnúk crater series or near the area of ​​greatest seismic activity must be considered.

Source: Icelandic Met Office (IMO)

Map of the lava from today’s eruption (image: IMO)

Lava overflowing from the north vent in Kilauea’s summit crater Halema’uma’u (image: USGS webcam)

Another lava-fountaining episode began in Kilauea’s Halemau’mau’u summit crater late evening at 10:57 p.m. HST local time on March 31 from the north vent. It is number 16 of the ongoing eruption began.

USGS reports that „Episode 16 was preceded by weak spattering in the north vent that began at approximately 5:20 p.m. HST on March 31, 2025. Since 6:00 p.m. HST, spattering became continuous and increased to low fountaining (15-30 feet or 5-10 meters high). Lava level gradually rose in the vent and is now overflowing out of the north vent cone onto the floor of Halemaʻumaʻu. Each of the prior 15 episodes ultimately involved significant lava fountaining, with the fountains of episode 15 exceeding 1,000 feet (305 meters) in height. High lava fountains are likely to follow the current dome fountaining and lava flows within 24 hours or less.

„Inflationary tilt on the UWD tiltmeter reached around 8 microradians since the end of the last episode, recovering about 90% of the tilt lost from episode 15. UWD tilt has flattened, but has not started deflating, at this time. Seismic tremor initially began increasing around noon HST on March 31, 2025, followed by a sharper increase around 4:30 p.m. HST the same afternoon. Tremor continues to steadily increase. Infrasound signals also strengthened beginning just before 6 p.m. HST when spattering became continuous and visible in north vent.

„Emissions of SO2 gas are elevated, and during recent episodes have reached 50,000 tonnes per day or more, and similar amounts of gas are expected to accompany any high fountaining activity that may occur during episode 16. Currently, winds at the summit are forecast to be weak, which may allow the plume of gas to spread around the summit region of Kīlauea. In addition, visitors to Hawaiʻi Volcanoes National Park and residents of adjacent areas may be exposed to Peleʻs hair and other small fragments of volcanic glass and tephra being carried in the plume, as they were during episode 15.

„Each episode of Halemaʻumaʻu lava fountaining since December 23, 2024, has continued for 13 hours to 8 days, and episodes have been separated by pauses in eruptive activity lasting less than 24 hours to 12 days.“