Locating and Measuring Earthquakes

Objectives:

    1.    Define magnitude and the Richter scale.

    2.    List ways to make your classroom and home more earthquake safe.

    3.    Explain how a seismograph is used to record earthquake waves and locate an earthquake's epicenter.

Vocabulary words:

    seismologist    seismograph      seismogram     magnitude    tsunamis

Resources:

    Link to USGS home page

Notes: (10-2)

 

As we discussed earlier, earthquakes occur all throughout the day (~1 every 10seconds) because the Earth is undergoing continual change as its plates drift atop the asthenosphere.  Seismology is the study of seismic waves (earthquakes).   Although the study of earthquakes have increased our understanding of the plates and their movements, the measuring equipment remains relatively simple.

 

Richter scale:

322 = 1024  

Richter Scale Graphic Representation

(www.sdgs.usd.edu/images/maps/ quake/RichterScale.gif)

Movement magnitude:

Locating the earthquake:

  triangulation

 

(earthquake.usgs.gov/4kids/learning/ images/triangulation.gif)