<p>An earthquake with a preliminary magnitude of 6.1 jolted Batangas province on the main Philippine island of Luzon on Sunday, the Philippine Institute of Volcanology and Seismology said.</p>.<p>The institute said the quake, which occurred at 5:50 am, hit at a depth of 132 km, about 21-km northwest of Calatagan town.</p>.<p>The tremor was also felt in Metro Manila and the provinces of Bulacan and Oriental Mindoro, Xinhua news agency reported.</p>.<p>There were no immediate reports of damage or casualties.</p>.<p>The institute added that the tectonic quake will trigger aftershocks and can cause damage.</p>.<p>The Philippines has frequent seismic activity due to its location along the Pacific "Ring of Fire".</p>
<p>An earthquake with a preliminary magnitude of 6.1 jolted Batangas province on the main Philippine island of Luzon on Sunday, the Philippine Institute of Volcanology and Seismology said.</p>.<p>The institute said the quake, which occurred at 5:50 am, hit at a depth of 132 km, about 21-km northwest of Calatagan town.</p>.<p>The tremor was also felt in Metro Manila and the provinces of Bulacan and Oriental Mindoro, Xinhua news agency reported.</p>.<p>There were no immediate reports of damage or casualties.</p>.<p>The institute added that the tectonic quake will trigger aftershocks and can cause damage.</p>.<p>The Philippines has frequent seismic activity due to its location along the Pacific "Ring of Fire".</p>