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Kilauea volcano (Hawai'i): strong seismic swarm on Ka`oiki faults

Saturday Feb 25, 2012 08:42 AM | BY: T+P

Recent earthquakes at Kilauea volcano (as of 24 Feb 2012)
Recent earthquakes at Kilauea volcano (as of 24 Feb 2012)
An unusual seismic swarm is occurring near the summit of Kīlauea volcano, Hawai`i, and continues to increase as of today.
The Ka`oiki seismic swarm began about 5 km (3 mi) northwest of Halema`uma`u Crater on 21 February and has produced more than 1000 quakes so far.
Increased activity overnight included 4 magnitude 4+ earthquakes amongst more than 70 additional earthquakes in the past 24 hours. 78 earthquakes were strong enough to be located beneath Kilauea in the past day: 74 quakes were related to the earthquake swarm, 2 were within the upper east rift zone, and 2 were on south flank faults.
Some of the quakes were felt at the Hawai`i Volcano Observatory where the shaking caused books fall off shelves, and minor damage was reported at the Volcano Golf Course, which is the closest inhabited area located about 3 km from the earthquakes' epicentre. Many of these earthquakes were widely felt on-island, including at our Hawai`i office near Kīlauea's summit.
Swarms in this area typically indicate movement between Mauna Loa and Kīlauea volcanoes unrelated to magma migration, but continued long-term pressurization of Kīlauea's summit complicates the local stress field and may have some bearing on the current seismic activity. Similar swarms have occurred in 1990, 1993, 1997, and 2006, some of which lasted up to several weeks.
Links / Sources:
Previous news
Thursday, Feb 23, 2012
The new Smithsonian / USGS Weekly Volcanic Activity Report is out. Updates include: ... [more]
Saturday, Feb 18, 2012
Photos from our last tour to Guatemala (Jan 2012) - Pacaya, Atitlan, Santiaguito and Fuego volcano are now online! The next tours to Guatemala: 8-21 Dec 2012 and 22 Dec 12 - 4 Jan 13. [more]
Wednesday, Feb 15, 2012
The new USGS / GVP weekly activity updates report is now available. The summary: ... [more]

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