# Friday, March 23 nd 1 Attendance 2 Go over Review Sheet Test Pass Back papers.

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Friday, March 23 nd 1 Attendance 2 Go over Review Sheet Test Pass Back papers

Da’ Lab When did the P-wave hit? When did the S-Wave hit? Subtract to get the difference. Use the chart to find the epicenter distance Mark the edge of the paper with the time difference Move paper to find the place where the two lines are that far apart. Look down to see the epicenter distance Use the safety compass to draw the circle - with the correct distance around the city.

Earthquakes The sudden shaking of the ground.

I. Earthquakes Are sudden trembling or movement of the ground There are over 1 Million Per year (1 per second) A major cause of earthquakes is faulting

Fault

I. Earthquakes Faulting – sudden movement of rock along planes of weakness in the earth’s crust Faults - planes of weakness in the Earth’s crust. Rock is stressed to the breaking point and the two halves have an elastic rebound. Great masses of rock suddenly scrape past one another.

Focus Epicenter

I. Earthquakes Focus - the point where the rock breaks. Epicenter - the point on the Earth’s surface directly above the focus. Analysis of seismic waves allows the determination of the location of epicenters.

Seismograph

Seismogram

II. Earthquake Waves When faulting occurs, vibrations called seismic waves spread out in all directions from the focus. Seismograph - a device that detects measures, and records the motions of the earth associated with seismic waves.

II. Earthquake Waves  Seismogram - the line that was recorded on paper by a seismograph  Magnitude - the total energy released by an earthquake

Richter Scale

Mercalli Scale

P-Waves Primary / Compressional First to arrive Fastest Can travel through Feverything: solids, liquids and air

S-Waves Secondary Waves Shear Waves Second to arrive Travels only through solids

Name Earthquake Vocabulary 1.Earthquake – 2.Faulting – 3.Fault- 4.Focus – 5.Epicenter – 6.Seismic- 7.Seismograph - 8.Seismogram - 9.Magnitude - 10.Richter Scale - 11.Mercalli Scale - 12.P-wave (primary) - 13.S-wave (secondary) -

Questions

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