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Earthquakes Resources

Page history last edited by coylem@... 12 years, 11 months ago

Earthquake Class Resources:

Textbook Connection:

Read Chapter 6

6.1 Earthquakes and Plate Tectonics

6.2 Recording Earthquakes

6.3 Earthquake Damage

Introduction to Earthquakes: Earthquakes.ppt

Introduction to Tsunamis: Tsunamis.ppt

World Map.pdf

Plot at least 60 Earthquakes from USGS list of significant earthquakes.doc

Your map should look a lot like this: Earthquake Map.pdf

Large Deep Earthquake Map.pdf

Earthquake Waves Explained

Virtual Earthquake Online Activity (Java required, Mac users only use latest version of Firefox) students must register with their class codes:

A Block Honors:  1786650

C Block Honors:   1786764

F Block:    1786884

-You must complete Activity 1 "Travel Times"

-Then complete Activity 2 "Epicenter and Magnitude"

-When finished take the quiz, first sign in using the code above and your name

Find the Fault

EARTHQUAKE TOWER PROJECT (overview/rules/regulations)

Richter Magnitude:

Most people have heard of the Richter Scale for measuring the 'size' or 'strength' of an earthquake. This scale is quantitative and based on the amount of energy released by an earthquake.

The inferred energy of a quake is a function of both the amplitude and the duration of a single wave. The seismogram below shows waves with a wide range of amplitude (up to +/- 350) and duration (the first big wave cycle - up, down, back to zero - started just after 8 minutes on the chart and ended nearly 40 seconds later; other waves lasted only seconds).

Seismogram

So when you do all the math, here is what you get.

One unit on the Richter Magnitude Scale corresponds to a tenfold increase or decrease in the amplitude of the wave on the seismogram - 350 in this example would become either 3500 or 35! This change, when summed over all the wavelengths and wave types, translates to a 30 times increase in energy.

Mercalli Intensity:

The Modified Mercalli Intensity Scale is a qualitative assessment of the kinds of damage done by an earthquake. To avoid confusion with the Richter Magnitude scale, the Mercalli scale is reported using Roman Numerals on a scale from I to XII.

Background on Earthquakes: