MAGNITUDE 1
The point inside Earth where an earthquake begins.
FOCUS
The point on Earth’s surface directly above the focus.
EPICENTER
A break or crack in Earth’s crust
FAULT
The shaking of the ground during an earthquake.
ground shaking
Huge ocean waves caused by an underwater earthquake.
tsunami
A device used to detect and record earthquakes.
SEISMOGRAPH
The scale used to measure the magnitude based on energy released.
Richter scale
When rocks and soil slide downhill after an earthquake.
landslide
The best safety action during shaking.
Duck, Cover, and Hold On
The kit you need to prepare before an earthquake.
go-bag or emergency kit
The giant slabs of crust that move and interact on Earth.
tectonic plates
The part of the house you should avoid because items might fall.
windows or glass areas
The agency that monitors earthquakes in the Philippines.
PHIVOLCS
The branch of science that studies earthquakes.
seismology
The instrument used to record earthquake waves.
seismograph
Before an earthquake, your family should practice this activity to know what to do.
earthquake drill
This scale measures the damage and effects of an earthquake.
Mercalli Intensity Scale
Type of earthquake caused by the movement of tectonic plates.
tectonic earthquake
Small earthquakes that occur near volcanic activity.
volcanic earthquakes
Fault where the hanging wall moves down relative to the footwall.
normal fault
A weak shaking caused by the movement of rocks underground.
tremor
These boundaries slide past each other and commonly create earthquakes.
TRANSFORM BOUNDARIES
One plate moves under another at this type of boundary.
subduction zone
Fault where two blocks slide past each other horizontally.
strike-slip fault
The fault in the Philippines that runs from Luzon to Mindanao and can create strong earthquakes.
Philippine Fault Zone