A MAGNITUDE 4 earthquake shook Mountain Province at 11:34 a.m. yesterday, with the epicenter recorded around the town of Sagada. No aftershocks were expected and there were no immediate reports of major damages, according to the Philippine Institute of Volcanology and Seismology (Phivolcs). Earlier in the day, two other moderately strong tremors were monitored by Phivolcs: 4.2 in Tarragona, Davao Occidental and 5.1 in waters off Calayan, Cagayan.