Regional Director Olivia M. Luces said the OCD-RDRRMC has raised its alert status in all operation centers to ensure the proper monitoring, coordination and response to the affected areas and disseminated quake advisories since Saturday.
The USGS said the quakes occurred over a period of about 20 minutes.
A state of calamity means local officials can tap emergency funds and impose a price freeze on basic commodities.
Phivolcs said Intensity 7 was felt in Mabini, Batangas while Intensity 6 was felt in Calatagan, Nasugbu and Tingloy in Batangas.
The network also broadcast live footage of frightened commuters fleeing the passenger terminal at the port of Batangas, near the epicenters.
AP reported on Saturday that cracks could be seen in buildings in Mabini.
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The quakes caused power outages across the region but caused no casualties, Romina Marasigan, spokeswoman for the National Disaster Risk Reduction and Management Council, told AFP.
Intensity 5 was recorded at Batangas City, Lemery and Sto.
A Reuters reporter said feeling a tremor for over a minute in the Makati business district of Manila.
The Philippines sits on the highly seismically active zone "Pacific Ring of Fire" where many continental plates on the earth's crust keep colliding.
So far the institute has not received any reports of damage or casualties.
"It would be best if they will just stay inside their homes".
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The provincial disaster council also reported landslides in Agoncillo and Batangas City.
The USGS said the tremor struck 3:08 p.m. and 3:09 p.m. with an epicenter 13 km northeast of Mindoro province.
Aside from houses, hospitals were also damaged in the tremors.
House Deputy Speaker Raneo Abu, who represents Batangas' second district which was hardest hit by the quake, said his constituents are in "dire need of tents, food and water". "So there is no need to conduct relief operation", he also said.
Apart from the church, the municipal building also suffered a crack on the right side.
Employees, tenants and customers of two big malls in Lucena City were evacuated to the parking area while awaiting the advisory of local disaster agencies.
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Chief Inspector Glenn Valdepenas, jail warden, said they had to temporarily cancel the visiting hours due to the quakes.