Posted by: mrborden | February 24, 2013

Week 24 Earthquakes

March 1 2013
QFD: 29.Trying to be someone else is a waste of the person you are.
?FD: How many seismographs does it take to find the epicenter of an earthquake?
Objective: 3d. Students know why and how earthquakes occur and the scales used to measure their intensity and magnitude
1) Draw and label the earthquake safe house

Then draw a floor plan of your house on the back of the paper
HW: Identify problem areas in your house concerning earthquake preparedness

Feb 28 2013
QFD: If you really want to do something, you’ll find a way. If you don’t, you’ll find an excuse.
?FD: Describe the difference between the focus and the epicenter of an earthquake in a few sentences
Objective: 3d. Students know why and how earthquakes occur and the scales used to measure their intensity and magnitude
1) finding the epicenter of an earthquake


Feb 27 2013
QFD: 11.Life is 10% of what happens to you and 90% of how you react to it.
?FD: What type of wave does not travel through liquids?
Objective: 3d. Students know why and how earthquakes occur and the scales used to measure their intensity and magnitude.
1) Quiz Earthquakes and Plate boundaries

1 The __________ of an earthquake is a qualitative measurement of the amount of DAMAGE caused by the earthquake.

A Richter scale
B magnitude
C intensity
D epicenter

2 The Mercalli scale, the Richter scale, and the European Macroseismic scale are ALL used to measure __________ of earthquakes.

A only the magnitude
C either the magnitude or the intensity
B only the intensity
D both the magnitude and the intensity

3 How many types of seismic waves does a seismogram illustrate?

A 1
B 3
C 4
D 10

4 Earthquakes most often happen along __________ faults.

A new
B small
C large
D existing

5 What is the minimum number of seismographs needed in order to find the exact location of an earthquake’s epicenter?

A 1
B 2
C 3
D None

6 An earthquake is produced when the slippage of rocks occurs at a weak point in the ground. What is that weak point called?

A focus
B epicenter
C fault
D foreshock

7 A tsunami that is triggered by an earthquake occurs when the __________.

A seafloor sediment is moved by oceanic currents
B seafloor is displaced vertically along a fault
C seafloor is drilled for oil
D subduction zones move along the seafloor

8 What is happening when an earthquake occurs on a convergent plate boundary?

A two plates are colliding together
B two plates are dividing apart
C two plates are grinding past each other in a side-by-side motion
D two plates move together to form a mid-ocean ridge

9 When reading a seismogram, which are the first waves to arrive?

A S waves
B surface waves
C P waves
D foreshocks

10 Which of the following faults was responsible for the 1906 San Francisco earthquake?

A San Jacinto
B San Andreas
C Oakland
D Simi Valley

11 What type of instrument is used to record earthquakes?

A seismograph
B magnitude graph
C surface wave graph
D intensity graph

12 Which of the following best describes an aftershock?

A larger and more devastating earthquakes that occur after the first initial earthquake
B smaller earthquakes that occur before a large earthquake
C smaller and weaker earthquakes that occur after a larger earthquake
D small earthquakes that occur along small fault systems

13 The epicenter of an earthquake is located __________.

A at the same depth of the focus
B directly under the focus
C directly above the focus
D beneath the earth’s crust

14 What scale is used for measuring the magnitude of small, shallow earthquakes by measuring the amplitude of the largest seismic wave?

A seismograph
B the Mercalli scale
C the European macroseismic scale
D the Richter scale

15 The Aleutian islands off the shore of Alaska are an arc-shaped chain of small volcanic islands called a volcanic island arc. Which type of convergent boundary process formed these islands?

A oceanic-continental
B continental-continental
C oceanic-oceanic
D seafloor spreading

16 Which of the following would be considered a convergent boundary?

A two oceanic plates spreading away from each other
B an oceanic lithosphere diving beneath another plate
C a continental plate spreading away from another continental plate
D a continental plate grinding along side another continental plate

17 Seafloor spreading happens along what type of plate boundary?

A convergent
B divergent
C San Andres
D subduction

18 Which of the following would happen if two oceanic plates converge?

A both plates would diverge away from each other
B continents would stop moving
C one would descend beneath the other
D both plates would stop moving

19 Which type of plate boundary would create a rift valley?

A divergent
B convergent
C transform
D uniform

20 Which of the following events would occur at a transform boundary?

A shallow focus earthquakes
C deep focus earthquakes
B volcanoes
D formation of a new sea floor

21 When two continental plates converge together, what type of geographic formation will be the result?

A rift valleys
B island arcs
C trenches
D folded mountains

22 A tectonic plate boundary that occurs when two plates grind past each other without the production or destruction of lithosphere is a __________.

A convergent boundary
B divergent boundary
C transform fault boundary
D major plate

23 Which of the following is a reason why the ocean floor is said to be relatively new?

A The rate of sea floor spreading is rapid enough to recycle the ocean floor in a 200 million year cycle.
B The ocean floor only appeared about 180 million years ago.
C The ocean floor was only discovered relatively recently.
D The rate of sea floor spreading is rapid enough to recycle the ocean floor in a 4 billion year cycle.

24 With the sediment from ocean drilling, scientists found that the youngest oceanic crust is located at __________.

A continental margins
B bottom of oceanic trenches
C ridge crests
D subduction zones

25 With evidence of seafloor spreading, __________ form at sites of plate convergence where one moving plate descends beneath another and plunges back into the mantle.

A hydrothermal vents
C mid-ocean ridges
B guyots
D deep ocean trenches

Feb 26 2013
QFD: You cannot change what you refuse to confront. Anonymous
?FD: Describe the 3 types of seismic waves?
Objective: 3d. Students know why and how earthquakes occur and the scales used to measure their intensity and magnitude.
1) video clip
2) activity on page 160/161 DUE TOMORROW

Feb 25 2013
QFD: “Love is an emotion experienced by the many and enjoyed by the few.” – Author Unknown
?FD: What is a seismograph?
Objective: 3d. Students know why and how earthquakes occur and the scales used to measure their intensity and magnitude.
1) check vocab
2) read/notes on Earthquakes

Deeper earthquakes carry more energy to the surface than Shallow Earthquakes
Seismic waves carry energy from the focus of an earthquake to the surface
The three types of seismic waves are:
P Waves (Primary waves) arrive first and travel through solids, liquids, and gases
Secondary Waves ( S waves) vibrate sideways and up and down, cannot travel through liquids but travel through solids and gases
Surface waves – l waves (love waves) cause damage on earth surface and travel outward from the epicenter

Scales Used to measure earth quakes:
Richter Scale – 1-10 scale that measures the seismic waves and determines the magnitude only of an earthquake 1 weakest 10 strongest
Mercalli scale – scale from 1-12 that details how earthquakes affect humans, buildings, and landforms on earths surface
Moment magnitude Scale – combination scale used by seismologists today that accounts for the total energy released during an earthquake ( each point on scale is 32X greater than previous number) Example A 3.0 is 32X stronger than a 2.0 the difference between a 3 and 5 is almost 1000 times greater


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