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Slower than P waves but faster then surface waves.P waves=They push ( compress ) and pull ( expand ) rocks in the direction the wave travels. Also known as compression waves. Can travel through solids, liquids & gas. Fastest waves (arrive 1st to the seismograph)The order would be P,S,Surface.
How do scientist locate earthquakes?
(distance and directions)The difference in velocities of P waves provides a way to locate the epicenter.
Scientists use a travel-time graph, in which one needs at least 3 seismograph station data.
Where do most earthquakes occur ?
Most of these earthquakes occur around the outer edge of the Pacific Ocean. This zone is known as the circum-Pacific belt. Active earthquake area in this zone include Japan, the Phillipiness, chile, and Alaska’s Aelutian Islands.
Describe each of the different scale used to measure earthquakes. Which one measures intensity and which one measures magnitude? What is the difference between magnitude and intensity ?
Richter Scale=measures the magnitude of an earthquake. Based on the amplitude of the largest seismic wave. A ten fold system.
News reporters use this scale, but scientists no longer use this scale.