8.2 Measuring Earthquakes  A) Seismographs - instruments that record earthquake waves.  B) Seismograms electronically recorded ground motion made by.

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8.2 Measuring Earthquakes  A) Seismographs - instruments that record earthquake waves.  B) Seismograms electronically recorded ground motion made by seismographs. I. Instruments

Seismograph

Seismogram

II. Earthquake Waves 8.2 Measuring Earthquakes  A) Body Waves 1) P waves - Have the greatest velocity of all -Are push-pull waves that push (compress) and pull (expand) - Travel through solids, liquids, and gases

Earthquake Waves 8.2 Measuring Earthquakes S waves - Slower velocity than P waves - Travel only through solids

8.2 Measuring Earthquakes  Surface waves seismic waves, travel along Earth’s outer layer.

Seismic Waves

Locating an Earthquake 8.2 Measuring Earthquakes  Earthquake Distance Travel-time graphs from 3 or more seismographs can be used to find the exact location of an earthquake epicenter. The epicenter is located using the difference in the arrival times between P and S wave  Earthquake Direction

Measuring Earthquakes 8.2 Measuring Earthquakes Richter Scale  Richter Scale Based on the amplitude of the largest seismic wave. Increases 32 times each increase

Measuring Earthquakes 8.2 Measuring Earthquakes  Moment Magnitude Moment magnitude is the most widely used - estimates the energy released by earthquakes.

Earthquake Magnitudes

- The majority of all earthquakes that occur on Earth are found at or near plate boundaries. 8.2 Earthquake locations

Some Notable Earthquakes