DOC PREVIEW
NAU GLG 112 - Measuring Earthquake Size
Type Lecture Note
Pages 2

This preview shows page 1 out of 2 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 2 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 2 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

GLG 112 1st Edition Lecture 14Outline of Last Lecture I. Seismic WavesA. Body Waves1. P-waves (primary)a. Speedb. Movement c. What we feel2. S-waves (secondary)a. Speed b. Movementc. What we feelB. Surface wavesII. Measuring seismic wavesOutline of Current Lecture I. Magnitude (quantitative)A. Richter scale1. How is it calculated?2. What is it based on?3. Problems B. Moment Magnitude Scale 1. How is it calculated?2. What is it based on?II. Earthquake intensity (qualitative)Current LectureThe magnitude of an earthquake is measured quantitatively in two ways. The Richter scale is the first scale that was used to measure earthquake magnitude. It takes oneseismogram and measures two things. It measures the difference of P and S wave arrival time (i.e. the distance from the epicenter). It also measures the amplitude of the greatest shaking. The Richter scale is based on the amount of shaking and the logarithmic scale (i.e. each increase in magnitude=ten times more shaking). There are a couple problems with this scale. First, it only works with small earthquakes. Second, it doesn’t work with different rock types (i.e.it basically only works in southern California).These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.The Moment Magnitude Scale is the updated scale. It is calculated by the size of the fault, the amount of slip, and the rock strength. It is based on the cause of the earthquake and the energy release. For each increase in magnitude there is about 32 times more energy. The intensity of an earthquake is measured


View Full Document

NAU GLG 112 - Measuring Earthquake Size

Type: Lecture Note
Pages: 2
Download Measuring Earthquake Size
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Measuring Earthquake Size and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Measuring Earthquake Size 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?