Great
Earthquakes In Diverse Places
Hawaii: Scientists monitor swarm of 50 earthquakes near
Kilauea volcano
February 22, 2012
Volcano Community
50 earthquakes and counting on the Big Island as of Wednesday
morning
HAWAII VOLCANOES NATIONAL PARK, Hawaii: Scientists at the USGS
Hawaiian Volcano Observatory are keeping an eye on a swarm of
small earthquakes around the active Kilauea volcano.
In its morning status report, HVO wrote that there “is an ongoing
seismic swarm just northwest of the summit.”
From the Wednesday status report, updated at 7:29 HST:
A swarm of shallow earthquakes started after midnight last
night about 5 km (3 mi) northwest of Halema`uma`u Crater that was
ongoing as of this posting. Forty-eight earthquakes were strong
enough to be located beneath Kilauea: 39 quakes within the swarm
so far at a maximum rate of 6/hr (including a preliminary
magnitude-3.4 quake at 6:56 am), two deep quakes beneath the
southwest rift zone, two beneath the southeast summit caldera, one
within the upper east rift zone, four on south flank faults.
Seismic tremor levels were low and dropped slightly during
deflation.
Most of the quakes have been in the magnitude 2.0 vicinity, but a
few reached over 3.0.
Seismic activity on the rift zone is not rare, however this number
of small earthquakes is high for the present eruptive activity.