the Modified Mercalli Scale epicenter dip P waves ... S waves .... Surface waves back and forth parallel to the direction of wave travel the 1906 San Francisco earthquake 1 normal 25% normal about 5 to 10 times per year the resistance to flow of a
liquid the resistance to flow of a liquid stay the
same stay the same stay the same mantle ... outer core P waves only increases A is 10X more
intense than B P waves directly below the epicenter
dip dip epicenter normal
variations in air pressure A A A A and C back and forth parallel to the direction of wave travel back and forth parallel to the direction of wave travel Charles Richter the area of the fault break Richter scale convergent plate boundaries normal faulting
shallow-focus earthquakes caused by normal faulting shallow-focus earthquakes caused by normal faulting New Madrid, Missouri,
1812 tsunami undersea earthquakes P waves Most earthquakes occur at plate boundaries An increase in the frequency of smaller earthquakes in
the region scientists can accurately predict the time and location of almost all earthquakes |