By USGS/HVO Staff
HAWAI'I ISLAND, Hawaii – The U.S. Geological Survey's Hawaiian Volcano
Observatory (HVO) has recorded more than 100 earthquakes in a swarm
that began around 1:17 a.m., HST, on Wednesday, February 22, 2012. The
earthquakes are located about 5 km (3 mi) north-northwestof Kilauea
volcano's summit, near Namakanipaio in Hawai'i Volcanoes National
Park, at depths of 2–5 km (1–3 mi).
The largest earthquakes of the ongoing swarm have been a magnitude-4.1
quake at 9:02 p.m. last night and a magnitude-4.3 quake at 3:52 a.m.
this morning. These earthquakes were widely felt on the Island of
Hawai'i.
As of 9:00 a.m. Friday, the USGS "Did you feel it?" Web site (
earthquake.usgs.gov/eqcenter/dyfi/ ) had received 74 felt reports for
the 9:02 p.m. earthquake and more than 60 felt reports for the 3:52
a.m. event.
The initial magnitude of the 9:02 p.m. earthquake was estimated at 4.1
by HVO's automated softwaresystem, but then increased to
magnitude-4.3. After close review by HVO seismic analysts this
morning, the earthquake's magnitude has been calculated tobe 4.1.
The effects of the early morning magnitude-4.3 earthquake were evident
at the Hawaiian Volcano Observatory building, which is located less
than 4 km (2.5 mi) from the swarm's center. HVO staff noticed that a
few books andother items had fallen off shelves and some small ceiling
fixtures were dislodged. Several residents of the Volcano Golf Course
subdivision, located about 3 km (2mi) from the earthquake epicenter,
also reported items falling from shelves, causing some minor breakage.
As of this morning, the seismic swarm has also included 3 earthquakes
with magnitudes between 3.0 and 3.9, and 25 earthquakes with
magnitudes of 2.0 to 2.9. The magnitudes of another 88 located
earthquakes are between 1.0 and 1.9.
The earthquake swarm is located at the north end of the Ka'oiki Pali,
near the boundary between Mauna Loa and Kilauea volcanoes. This area
has experienced previous seismic swarms in 1990, 1993, 1997, and 2006,
each of which lasted from 1day to several weeks.
According to Jim Kauahikaua, HVO's Scientist-in-Charge, it's likely
that high rates of seismicity could continue in this area for several
days. He added that the earthquake swarm has not causedany obvious
changes in Kilauea's magma plumbing system or ongoing eruptions, but
that the magnitude-4.3 earthquake did cause a small rockfall in the
activevent located within Halema'uma'u Crater at the summit of
Kilauea.
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