Chap C1.2

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Information about Chap C1.2

Published on February 21, 2008

Author: stviator4b

Source: slideshare.net

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Earthquakes Measurement

Earthquakes and How They Are Measured

How Earthquakes Occur earthquake: a vibration, or shaking, of Earth’s crust fault: found in the crust – a break along which rocks move rocks on either side of the fault move up/down, side/side, or both

earthquake: a vibration, or shaking, of Earth’s crust

fault: found in the crust – a break along which rocks move

rocks on either side of the fault move up/down, side/side, or both

earthquakes happen where plates are moving past each other rocks get stuck and don’t move plates continue to move – building pressure on rocks when enough pressure is put on the rocks, they break and the plates move suddenly the sudden movement causes vibrations in the Earth’s crust focus : the point underground where the movement first took place when rocks slip at focus, energy moves out in all directions through the rock around it epicenter: the point on the surface that is right above the focus the damage from the vibrations is caused by the release of energy at the epicenter

earthquakes happen where plates are moving past each other

rocks get stuck and don’t move

plates continue to move – building pressure on rocks

when enough pressure is put on the rocks, they break and the plates move suddenly

the sudden movement causes vibrations in the Earth’s crust

focus : the point underground where the movement first took place

when rocks slip at focus, energy moves out in all directions through the rock around it

epicenter: the point on the surface that is right above the focus

the damage from the vibrations is caused by the release of energy at the epicenter

How Earthquakes Are Measured energy from a earthquake travels as waves through the Earth energy can be measured in different ways seismograph: an instrument that records earthquake waves 2 main parts – a pen and paper covered rotating drum as the drum turns, the pen marks – when an earthquake happens the line gets jagged the more jagged the line, the stronger the earthquake

energy from a earthquake travels as waves through the Earth

energy can be measured in different ways

seismograph: an instrument that records earthquake waves

2 main parts – a pen and paper covered rotating drum

as the drum turns, the pen marks – when an earthquake happens the line gets jagged

the more jagged the line, the stronger the earthquake

the Mercalli scale : measures movement and damage that an earthquake causes scale uses Roman numerals from I to XII earthquake measuring III makes hanging objects swing back and forth earthquake measuring X causes brick buildings to crumble Richter scale : uses numbers 1 to 9 to measure the energy an earthquake releases earthquake measuring 3.0 releases 30 times the energy as an earthquake measuring 2.0 and 900 times the energy as an earthquake measuring 1.0

the Mercalli scale : measures movement and damage that an earthquake causes

scale uses Roman numerals from I to XII

earthquake measuring III makes hanging objects swing back and forth

earthquake measuring X causes brick buildings to crumble

Richter scale : uses numbers 1 to 9 to measure the energy an earthquake releases

earthquake measuring 3.0 releases 30 times the energy as an earthquake measuring 2.0 and 900 times the energy as an earthquake measuring 1.0

Summary fault in Earth’s crust is a break along which rocks move earthquake is the vibrations produced when energy builds up and is quickly released along a fault Mercalli and Richter scale measure earthquake intensity

fault in Earth’s crust is a break along which rocks move

earthquake is the vibrations produced when energy builds up and is quickly released along a fault

Mercalli and Richter scale measure earthquake intensity

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