MANILA - There is no significant rise of activity in the Philippine Trench, state seismologists said Wednesday, after several temblors jolted parts of Luzon, Visayas, and Mindanao in a span of three days.

State seismologists record about 20 earthquakes a day, some of which originate from subduction in the Philippine Trench, the world's third deepest point in the ocean, Phivolcs research specialist Henry Peñarubia told reporters.

But data shows that there is "no significant rise" in activity in the Philippine Trench, he said.

"'Yung mga narereport kasi 'yung mga may damage, yung mga may direct impact sa structure at sa tao [pero] marami talagang events sa region na yan. It's normal," he said.

(The quakes being reported are those that result to damage, those that have direct impact to structures and people, but there are really a lot of events in that region.)

Phivolcs gave the clarification hours after consecutive magnitude 4 quakes were recorded in Davao Oriental and Davao Occidental.

On Monday, a 6.1-magnitude tremor rattled several areas in Central Luzon and Metro Manila, while a 6.5-magnitude quake was recorded in Eastern Samar the following day.

Only the Davao Occidental and the Eastern Samar temblors were linked to movements in the Philippine trench, Peñarubia said. The two other quakes originated from local faults in Zambales and Davao Oriental.

WHAT TO DO IN CASE OF AN EARTHQUAKE