The U.S. Geological Survey's Hawaiian Volcano Observatory reported a magnitude 4.0 aftershock at 5:26 a.m. centered about 12 miles northwest of Kawaihae. That was almost exactly at the origin of the smaller of Sunday's 6.7 magnitude and 6.0 magnitude earthquakes that did tens of millions of dollars worth of damage to Big Island schools, roads, water systems and Kawaihae Harbor.

A second, smaller aftershock also registered at 6:57 a.m.

Janet Snyder, public relations specialist for the county, said she fielded a phone call following the aftershock this morning from a distraught Pa'auilo resident.

"He was in tears. Basically, he was afraid that his house would collapse because the posts had separated so much from the piers," Snyder said. "He definitely did not feel safe enough to live in it."

The aftershocks also caused further damage to the Paniolo Club Condomiums in Waikoloa, where residents evacuated a dozen units in a three-story building because of what appeared to be major structural damage to the walls supporting the beams that hold up the vaulted ceilings.

"With the tremors this morning, we've seen additional damage in our unit and in our walkway, more cracks," said Jennifer Halley, a member of the condominium board of directors.

More than 100 people have also called the county Civil Defense officers over the past two days to report damage to homes and businesses, and county Deputy Engineer Jiro Sumada said four homes have been "red-tagged" so far by inspectors, meaning the occupants cannot return because the structures are unsafe.

Those homes include one in Kapa'au in North Kohala, one in Paauilo, one in Kona and one in Kawaihae, he said.