(2nd UPDATE) A magnitude 5.4 undersea earthquake struck northeast of Lubang in Occidental Mindoro early Sunday morning, with the tremor felt as far away as Metro Manila and nearby provinces, state agency Phivolcs said.

The tectonic quake struck at 3:18 a.m. at a depth of 76 kilometers.

Phivolcs initially measured the quake at magnitude 5.5 before later downgrading it to magnitude 5.4.

The tremor was recorded in the following areas:

Reported Intensities:

• Intensity IV - Makati City; City of Manila; Paranaque City
• Intensity III - Malabon City; Mandaluyong City; Pasay City; Pateros; Quezon City; Taguig City; Tagaytay City, Cavite; Calapan City, and Puerto Galera, Oriental Mindoro; Calatagan, and Lipa City, Batangas;

Instrumental Intensities:

• Intensity IV - Calatagan, Batangas; Malolos City, and San Ildefonso, Bulacan; Navotas City
• Intensity III - Calapan City, Oriental Mindoro; Talisay, Batangas; Bacoor City, and Tagaytay City, Cavite; Muntinlupa City; Guagua, Pampanga
• Intensity II - Magalang, Pampanga; San Juan City
• Intensity I - San Jose, Occidental Mindoro; Palayan City, and San Jose City, Nueva Ecija; Gumaca, Quezon; Baler, Aurora

Aftershocks are expected but no damage is forecast, Phivolcs said.

The United States Geological Survey (USGS), in a separate advisory, said the earthquake measured magnitude 5.3.

A USGS map showed the quake's epicenter just off Batangas province.