A News5 team that went to Mabini town encountered residents hurriedly loading their most vital necessities on jeepneys to seek safer ground.
Phivolcs director Renato Solidum said quake swarm, or events where local area experiences sequences of many earthquakes striking in a relatively short period of time, is common in areas, which were previously hit by an natural disaster.
The first took place 17 km to the west of Batangas neighbourhood at a depth of 40 km, said the US Geological Survey.
A wall had collapsed on a line of tricycles awaiting passengers. It originated one kilometer (km) southwest of Mabini, Batangas and was felt at Intensity 7.
A swarm of moderately sized earthquakes.
People gather outside the Basilica of the Immaculate Conception in Batangas City after twin quakes jolt Batangas province on Saturday, April 8, 2017.
The Philippine Institute of Volcanology and Seismology (PHIVOLCS) measured the first quake at magnitude 5.6, with its epicenter 2 kms northwest of Mabini.
Aftershocks are still possible after the swarm of quakes, he said, advising Batangas residents to remain in their homes. By April 5, at least 40 aftershocks were already recorded.
The quakes caused landslides, which blocked two roads and further damaged the old Taal Basilica as well as a hospital and several houses, officials told ABS-CBN television.
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Intensity 3 was felt in Makati City, Pasay City, Quezon City, Muntinlupa City, Malabon City, Mandaluyong City and Bacoor, Cavite. Tomas and Lemery Batangas; and Batangas City and Tagaytay City. Daet, Camarines Sur felt Intensity 2.
The USGS said the quakes occurred about 90 kms (55 miles) south of the capital Manila occurred over a period of about 20 minutes, sending people running out of buildings.
Department of Transportation Undersecretary Cesar Chavez said the Light Rail Transit and Metro Rail Transit 3 were on normal operations and there was no reported damage in both facilities.
In an urgent advisory issued after Saturday's quake, the PNR's Engr.
After the natural disaster, the Philippine National Railway issued an advisory to its train operators to take "extreme caution" of five kilometers per hour when passing Pandacan and Alabang bridges and "never allow two trains on said bridges". They were also instructed to "never allow two trains to pass under the same bridges at the same time".
"15 kph precaution on all other bridges until further advise", PNR Engineer Noli Tolentino said. A stronger natural disaster with a magnitude of 6.0 struck two minutes later in the same town.
Patients were brought out of a hospital amid alarm over aftershocks.
A team of Red Cross workers was dispatched to Batangas City to assist people experiencing fainting and dizziness.
Ironically, it was at the capitol where engineers advised retrofitting to ensure the building's stability after cracks were found at the accounting and budget offices.