VOLCANOES
VOLCANO
an opening or vent in the earth’s
surface where hot gases, lava and
rock fragments are ejected.
PHILVOLCS
Philippine Institute of
Volcanology and Seismology.
Monitors volcanic and seismic
activities in the Philippines.
ACTIVE VOLCANOES
erupted within historical times
(within the last 600 years),
accounts of these eruptions were
documented by man; erupted
within the last 10,000 years
based on analyses of datable
materials.
POTENTIALLY ACTIVE VOLCANOES
morphologically young-looking
but with no historical records of
eruption.
INACTIVE VOLCANOES
no record of eruptions;
physical form is being changed
by agents of weathering and
erosion via formation of deep
and long gullies.
Why does the
Philippines
have many
volcanoes?
The Philippines sits on a
unique tectonic setting ideal
to volcano formation.
The archipelago is surrounded
by subducting plates as
manifested by the trenches
that are related to volcano
formation.