According to the Philippine Institute of Volcanology and Seismology (Phivolcs), a 6.1-magnitude quake struck the northern Philippine provinces including the capital city, Manila on March 20, 2011 at 4:26PM.
The Institute located the epicenter of the 39-KM deep tectonic quake at 122 kilometers northeast of Laoag City.
Philvolcs also reported that the quake was felt at Intensity 5 in Pasuquin and Pagudpud Ilocos Norte; Intensity 4 in Calayan Island and Paoay, Ilocos Norte; Intensity 3 in Basco, Batanes; Sinait, Ilocos Norte and the towns of Gonzaga and Calamaniogan in Cagayan, and Manila City; and Intensity 2 in Baguio City.
Aftershocks are also expected according to the institute's bulletin of the said seismic activity.
There has been no damages reported.