EARTHQUAKES by dont worry about it

earthquakes happen because..

brendangb1003 — 2015-03-24 18:16:07 UTC

Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little. They don't just slide smoothly; the rocks catch on each other. The rocks are still pushing against each other, but not moving.

vocabulary

brendangb1003 — 2015-03-24 18:19:19 UTC

earthquake

any seismic vibration of Earth caused by the rapid release of energy

fault

crack along which movement takes place

elastic rebound

sudden energy release that goes with fault movement

focus

point of origin of an earthquake

epicenter

point on Earth's surface directly above an earthquake's focus

friction

a force that opposes the sliding motion between objects that are in contact

stress

the force per unit area that acts on a material

compressive stress

mass is squeezed or shortened

tension stress

mass is stretched or lenghtened

brendangb1003 — 2015-03-24 18:23:07 UTC

brendangb1003 — 2015-03-24 18:26:10 UTC

The spot underground where the rock breaks is called the focus of the earthquake. The place right above the focus (on top of the ground) is called the epicenter of the earthquake.

later in the process

brendangb1003 — 2015-03-24 18:28:43 UTC

After a while, the rocks break because of all the pressure that's built up. When the rocks break, the earthquake occurs. During the earthquake and afterward, the plates or blocks of rock start moving, and they continue to move until they get stuck again.

brendangb1003 — 2015-03-31 18:03:50 UTC

two plates colliding.

brendangb1003 — 2015-04-07 17:58:20 UTC

earthquake

brendangb1003 — 2015-04-07 18:00:37 UTC

earthquake damage

the largest earthquake recorded since 1900

brendangb1003 — 2015-04-07 18:02:49 UTC

chile

may 22, 1960

the magnitude is 9.5

the earthquake is responsible for 5,700 deaths

facts about earthquake

brendangb1003 — 2015-04-07 18:08:47 UTC

Almost 80% of all the planet's earthquakes occur along the rim of the Pacific Ocean, called the "Ring of Fire"; a region that encircles the Pacific Ocean and is home to 452 volcanoes (over 75% of the world's active and dormant volcanoes).

facts

brendangb1003 — 2015-04-07 18:11:18 UTC

each year cali has roughly 10,000 earthquakes each year.

brendangb1003 — 2015-04-07 18:14:00 UTC

fault line

brendangb1003 — 2015-04-07 18:15:31 UTC

A fault line is the surface trace of a fault, the line of intersection between the fault plane and the Earth's surface. Since faults do not usually consist of a single, clean fracture, geologists use the term fault zone when referring to the zone of complex deformation associated with the fault plane

brendangb1003 — 2015-04-07 18:21:03 UTC

elastic rebound

brendangb1003 — 2015-04-07 18:22:37 UTC

focus

brendangb1003 — 2015-04-07 18:24:15 UTC

epicenter