Kilauea volcano (Hawai'i): strong seismic swarm suggests magma intrusion at shallow depth, alert level raised
Tue, 24 Aug 2021, 17:4117:41 PM | BY: T
An intense earthquake swarm is in progress under the southern part of the Kilauea caldera, prompting the Hawaiian Volcano Observatory (HVO) to raise the alert status to "orange", as the earthquakes might indicate that magma is intruding at shallow depths and might lead to a new eruption in the near future.
Recent quakes under the caldera of Hawai'i's Kilauea volcano
The seismic swarm began on the evening of Aug 23, 2021, and is currently continuing. During the past 24 hours, there were more than 140 quakes detected in total, including 41 quakes of magnitudes 2.0 or higher. Most tremors occurred at shallow depths around 2-3 km under the surface.
A particularly strong sequence of earthquakes occurred at about 1:30 a.m., HST local time, with a magnitude 3.6 event at 1.36 a.m.
The Hawaiian reported that "The onset of the earthquake swarm was coincident with a change in the style of ground deformation at tiltmeters in the Kīlauea summit region, potentially indicating the shallow movement of magma beneath the south part of Kīlauea caldera."
"HVO will continue to monitor this activity closely and adjust the alert level accordingly."
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