4 8.2 Objective 1Identify the three types of seismic waves
5 Identify the three types of seismic waves The study of earthquake waves is called _________.The recording instrument is called a _______________.The record from a seismograph is called a _______________.A seismogram records the ______________ of the Earth.Tarbuck 6.6Tarbuck 6.7
6 Identify the three types of seismic waves have a __________ motion and have the _________ velocity of all waves.Tarbuck 6.8
7 Identify the three types of seismic waves Surface waveshave a complex motion and have the slowest velocity of all waves.Body wavesPrimary waves.also called _____ wavesP waves exhibit a _______________ (compression-rarefaction) motion.Primary waves travel through ________________________________.P waves have the ______________of all seismic waves.Identify the three types of seismic waves
8 Identify the three types of seismic waves Surface waveshave a complex motion and have the slowest velocity of all waves.Body wavesPrimary waves.also called P wavesP waves exhibit a push-pull (compressional) motion.Primary waves travel through solids, liquids, and gases.P waves have the greatest velocity of all seismic waves.Secondary (S) wavescreate a ___________ motion.only travel through ___________.velocity is ____________________________________.Identify the three types of seismic waves
9 8.2 Objective 2Explain how to locate the epicenter of an earthquake
10 Locating an Earthquake The focus is the place within Earth where Earthquake waves originate.Epicenteris the point on the surface directly above the focus.The epicenter is located using the ______________________________________________________, which can be related to distance.
11 Locating an Earthquake The focus is the place within Earth where Earthquake waves originate.Epicenteris the point on the surface directly above the focus.The epicenter is located using the difference in arrival times between P & S wave recordings, which can be related to distance.______________are needed to locate an epicenter.A circle equal to the epicenter distance is drawn around each station.The ___________ of the three circles is the epicenter.
12 Earthquake distribution Earthquake zones are closely associated with plate boundaries particularly ______________________________________________________________________________________________Shows distribution of earthquakes w/ > 5.0 magnitudebetween 1980 & 1990.
13 8.2 Objective 3Describe the different ways earthquakes are measured.
14 Earthquake intensity & magnitude Three scalesModified MercalliRichterMoment Magnitude
15 Earthquake intensity & magnitude Tarbuck Table 1_____________________ is a measure of the degree of earthquake shaking at a given locale based on the amount of damage.Intensity is most often measured by the ________________________________________
16 Earthquake intensity & magnitude is a concept introduced by Charles Richter in 1935.measured by the Richter scale ML based on the ____________________________________________________________Each unit of the Richter magnitude equates to roughly a ____ fold energy increase.____________________estimate adequately the size of very large earthquakes.Earthquake intensity & magnitude
17 Earthquake intensity & magnitude Moment Magnitude scalea ___________________magnitude measurementmeasures very large earthquakes.derived from the _______________________that occurs along a fault zone, the ___________ of the rupture surface, and _______________strength of the faulted rockLargest earthquakes