GEOSCI 100 Lecture Notes - Lecture 27: Fault Scarp, Subduction, Seismometer
9 May 2018
School
Department
Course
Professor
5/3/18
Earthquakes
*Seismology - the science of earthquakes
*The Ring of Fire - a major area in the basin of the Pacific Ocean where many earthquakes and
volcanic eruptions occur
*Earthquakes - sudden release of energy in crust that creates seismic waves
*P-waves - compressional waves that travel through
rock
- primary wave, the first wave to arrive
anywhere → fastest seismic waves
- Have a push/pull motion -- push and pull
particles in the direction of their path
- Go through solids and liquids
- Body waves because they move through the
interior of the earth
Lecture Slideshow Slide #16
*S-waves - secondary waves that travel at about half the speed of P waves. They push material at
right angles to their path of travel
- Also called a Shear wave (a strike-split motion)
- Only go through SOLIDS
- Body waves because they move through the interior of the earth
Lecture
Slideshow Slide #18
Document Summary
*the ring of fire - a major area in the basin of the pacific ocean where many earthquakes and volcanic eruptions occur. *earthquakes - sudden release of energy in crust that creates seismic waves. *p-waves - compressional waves that travel through rock primary wave, the first wave to arrive anywhere fastest seismic waves. Have a push/pull motion -- push and pull particles in the direction of their path. *s-waves - secondary waves that travel at about half the speed of p waves. They push material at right angles to their path of travel. Also called a shear wave (a strike-split motion) Body waves because they move through the interior of the earth. The ground surface moves in a rolling, elliptical motion. *the three different types of seismic waves are recorded by seismographs. The waves travel at different speeds and arrive at the seismograph at different times.
