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2 earthquakes shake Hawaii island

By Craig Gima

POSTED:
LAST UPDATED: 02:10 p.m. HST, Aug 11, 2013



Two earthquakes near Volcano on the Big Island were widely felt this morning, but caused no major damage.

A magnitude 4.8 earthquake hit at about 5:54 a.m. about 10 miles south of Volcano at a depth of 20 miles, according to the United States Geological Survey. Its magnitude was initially estimated at 4.6.

It was followed by aftershocks, including a magnitude 3.4 earthquake at about 6:07 a.m. in the same location.

People from Captain Cook to Honolulu, 215 miles away, reported feeling the earthquake on the USGS "Did you feel it?" website.

The Pacific Tsunami Warning Center said no tsunami was generated by the earthquake on land.

Scientists said the earthquake was centered in the Hilina region of Kilauea Volcano. about 5 miles south of the summit, almost directly under the Kulanaokuaiki campground within Hawaii Volcanoes National Park.

Hawaiian Volcano Observatory scientists said the earthquake was likely caused by the weight of the island causing a shift in the earth's mantle.

"The earthquake likely occurred on a near-horizontal fault plane in the mantle, which has hosted earthquakes in this region before.  Despite their location near Kilauea’s summit, it’s unlikely that the earthquakes were volcanic in nature due to their depth, which is below, and offset from, the volcano’s known magma plumbing system,” said

Wes Thelen, the observatory's seismic network manager.






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