by: Makenna, Sydney, Lilyan, Alex
Definition of Earthquakes
why do they happen?: earthquakes are usually caused by rock underground that suddenly break along a fault line. This sudden release of energy cause the seismic waves that make ground shake when two blocks of rock or two plates are rubbing against each other. (sydney)
Location of Earthquakes
what are plate tectonics?: a they explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithosphere plates that move slowly over the underlying mantle. (alex)
what is the name of the scale? what is their intensity?: their main scale is called the "richter magnitude scale", which was developed by Charles F. Richter. It's intensity is magnitude that was less than 3.5 which was generally not felt but recorded. (Makenna)
Earthquakes Major Fault Lines
What should you do to protect yourself during an Earthquake?: in most situations, you will reduce your chance of injury if you cover your hands and neck with both arms, clasping your neck with your hands. if a dest or table is nearby, crawl beneath it while keeping one arm over your head. you can also hold on to your shelter or your head and neck until the shaking stops. be prepared to move with your shelter if the shaking shifts it around.(lilyan)
research somemajo earthquakes that have occurred. tell about them:
1-July 27, 1976- China, Tongshan- 255,000 official-7.5 (estimated death at about 655,000)
2- december 26, 2004- Sumatra, indonesia-227,898- 9.1- deaths from earthquakes and tsunamis.
3- december 16, 1920- china,gansu- 200,000-8.6-major fractures,longslides
4-november 1, 1755- portugal , lisbon- 70,000-8.7- great tsunami.
5- may 31,1970- peru- 66,000-7.9-$530,000,000 worth of damage, great rock slide, and floods(lilyan)