Seismic Waves Flashcards
seismology
study of earthquake and earthquake waves
Seismic waves
- waves of energy caused by the sudden break-ing of rock within the earth or an explosion.
- energy that travels through the earth and is recorded on seismographs
is directly located above the hypocenter or focus.
epicenter
triangulation method
seismologists use this to determine the epicenter of an earthquake
PHIVOLCS
Philippine Institute of Volcanology and Seismology
the government agency responsible for providing us with knowledge about earthquakes.
Philippine Institute of Volcanology and Seismology or PHIVOLCS
number of seismic network across the philippines
104 seismic stations
two major kinds of seismic waves
body wave and surface wave
Body wave
- ## Travels through the interior of the earth
Body wave
- Arrives before the surface waves emitted by an earthquake
- Of a higher frequency than surface waves
Surface wave
- Travels only through the crust
- Of a lower frequency than body waves.
Surface wave
- Easily distinguished on a seismogram as a result
Surface wave
- Almost entirely responsible for the damage and destruction associated with earthquakes
types of body wave
P-wave (Primary) and
S-wave (Secondary)
P-wave
- The fastest kind of seismic wave
- The first to βarriveβ at a
seismic station - Can move through solid
rock and fluids - also known as compressional waves
S-wave
- ** main cause** of destruction during an earthquake.
- The second wave you feel
in an earthquake - Slower than a P wave
-
only move through
solid rock, not through
any liquid medium -
Move rock particles up
and down, or side-to-side*
types of surface wave
Love wave and
Rayleigh wave
Love wave
- Itβs the fastest surface
wave and moves the
ground from side-to-side - Produces entirely
horizontal motion
Rayleigh wave
- Rolls along the ground - side-to-side in the same direction that the wave is moving
- Because it rolls, it moves the ground up and down, and, which can be much larger than the other waves
- Most of the shaking felt from an earthquake is due to the Rayleigh wave
named after love wave
A.E.H Love or Augustus Edward Hough Love
named after Rayleigh wave
John William Strutt, Lord Rayleigh
direction of wave propagation
particles move in the same direction that the wave is moving in, which is the direction that the energy is traveling in
