The capital of the Philippines was rocked Saturday by a 6.0 earthquake that struck in the early hours of the morning.

The Philippine Institute of Volcanology and Seismology said the quake was centered 27 miles southwest of San Antonio, Zambales at 3:31 a.m.

A reporter for the Philippine Daily Inquirer said the quake was so strong it shook him and his son out of bed.

“The bed shook, the speaker fell and dogs barked,” Dennis Eroa wrote.  “That was the first time I experienced that kind of quake here in Olongapo.”

Officials reported only minor structural damage throughout the region.

Seismologists say that the residents of the area were lucky that the quake struck so far underneath the sea bed that a tsunami was not created and damage on land would be minimal.