Earthquake & Volcano Monitor — 2026-04-23
Kīlauea volcano in Hawaii is forecast to begin its 45th eruptive episode imminently, with USGS models pointing to April 22–23 as the most likely window for lava fountaining. In Utah, a swarm of small earthquakes struck Kanosh on April 19, prompting an official statement from the Utah Geological Survey. Meanwhile, global earthquake activity on April 22 recorded roughly 200 events worldwide, with the largest reaching M5.6.
Earthquake & Volcano Monitor — 2026-04-23
Seismic Activity
Utah Swarm: Kanosh Earthquake Sequence
On the morning of April 19, 2026, residents of southern Millard County, Utah, experienced a series of small earthquakes near the town of Kanosh. The Utah Geological Survey (UGS) released an official statement on April 21 classifying the activity as an earthquake swarm — a common geologic phenomenon that, while unsettling to locals, does not necessarily signal a larger impending event. UGS seismologists emphasized that these specific events fit the recognized pattern of a swarm rather than a foreshock sequence.
Global Earthquake Activity: April 22, 2026
Tracking data from EarthquakeTracker recorded approximately 200 earthquakes worldwide on April 22, with the largest event reaching magnitude 5.6. Live earthquake maps continue to update in near real-time as aftershocks from last week's M7.7 Sanriku earthquake off northeastern Japan persist.
Japan M7.7 Aftershock Sequence
The New York Times interactive tracker, updated as recently as April 23 at 3:23 a.m. Japan time, confirms that aftershock activity from the April 20 M7.7 earthquake off Japan's northeastern coast remains ongoing. The tracker documents seismic events within 100 miles and seven days of the mainshock.
Volcanic Watch
🔴 Kīlauea (Hawaii) — Alert Raised to WATCH; Episode 45 Imminent
The Hawaiian Volcano Observatory (HVO) elevated Kīlauea's alert level from ADVISORY to WATCH on Tuesday, April 21, following detection of shallow earthquakes beneath the south rim of Halemaʻumaʻu crater and localized ground deformation in the south caldera region.
USGS forecast models based on summit inflation indicate that Episode 45 lava fountains are likely to occur between April 22 and April 26, with April 22 or 23 identified as the most probable start dates based on current data.
🟠 Great Sitkin (Alaska) — ORANGE/WATCH
As of April 22, 2026 (19:15 UTC), the Alaska Volcano Observatory (AVO) maintains a ORANGE/WATCH alert for Great Sitkin volcano in the Aleutian Islands. A slow eruption of lava within the summit crater continues. This status has been in effect since July 23, 2021, reflecting the prolonged low-level effusive activity at the site.
Global Eruption Context
The Smithsonian Institution's Global Volcanism Program reports 40 volcanoes with continuing eruptions as of its most recent update (through March 31, 2026). Typically, around 20 volcanoes are actively erupting at any given time.
April 21 Volcano News Roundup
According to Volcano Earth's April 21 update, tremor activity at Piton de la Fournaise (Réunion Island) has ended, while slow but steady magma accumulation continues beneath Svartsengi in Iceland. Additional monitored volcanoes include Ruapehu (New Zealand), Stromboli (Italy), Campi Flegrei (Italy), and volcanoes in California and Colombia.
Earth Science
No peer-reviewed research findings published after April 21, 2026 were available in today's research results. For the most current scientific publications on seismic and volcanic hazards, readers may consult USGS, the Global Volcanism Program, and preprint servers directly.
Coverage period: April 22–23, 2026. All times in UTC unless otherwise noted. Earthquake data subject to revision as analysis continues.
This content was collected, curated, and summarized entirely by AI — including how and what to gather. It may contain inaccuracies. Crew does not guarantee the accuracy of any information presented here. Always verify facts on your own before acting on them. Crew assumes no legal liability for any consequences arising from reliance on this content.
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