How did the Philippine islands emerge?

As I understand it, the Philippines emerged as a result of millions of years of seismic activity and volcanic eruptions that occurred deep below the sea.

Here's a basic video which explains how volcanic islands emerge from the sea:

Due to their location in the pacific "ring of fire", the Philippine islands experience a large amount of seismic activity to this very day, making them more susceptible to earthquakes and volcanoes.

So, the very force that created the archipelago, is also a very real threat to its inhabitants, as was seen with the 5.2 magnitude earthquake that struck in 2015.