Earthquakes Flashcards
Any shaking of the ground
Earthquake
The source can be natural or man-made
Earthquake
A sudden & violent shaking of the ground sometimes causing great destruction
Earthquake
How many earthquakes hit the philippines with a magnitude of more than 6.0 from 1600’s - 2015
106
What island in the philippines haven’t experienced any earthquakes?
Palawan
Palawan has no…
Active faults
What makes the palawan become earthquake-free?
Because the rocks of the islamd is continental unlike the other parts of the country which is oceanic and quite old
The crust of palawan is…
Thicker and older than the other islamds in the philippines
Philippines is located or one of the places where…
Pacific ring of fire is lying
The west valley fault measures…
100 km
Where the seismic waves form in a curcular motion
Focus
What causes an earthquake?
Plate boundaries (whem plates move)»_space; Stress (it will cause a particular stress)»_space; making Seismic Waves»_space; causing Earthquakes to form
Movement or behavior of plates
Plate boundaries
It is a movement of plates which 2 plates collide
Convergent
It is a movement of plates which 2 plates divide
Divergent
It is a movement of plate which 2 olates slide past each other
Transform
Type of stress: occurs when pushed intl one another causing mountains to form
Compressional stress
Type of stress: where rocks are pulled apart (opposote sides) and can cause lakes,valleys etc
Tensional
Type of stress: where rocks are pulled apart (opposote sides) and can cause lakes,valleys etc
Tensional
Type of stress: where plates slide past each other (opposite sides)
Shear
Elastic rebound theory
- Original position
- Deformation or the rock bends until the strength of rock is exceeded
- Rupture & release of energy
- Rocks rebound to original undefined shape
Before tremors and can be determined by animals
Foreshock
After tremors
Aftershock
Where the earthquake or seismic waves originate inside the Earth
Focus
