Here are the steps to finding an earthquake epicenter using three seismograms: 1. Determine the epicenter distance from three different seismographs. The longer the time between the arrival of the P-wave and S-wave, the farther away is the epicenter. So the difference in the P- and S-wave arrival times determines the distance between the epicenter and a seismometer. 2. Draw a circle with a radius equal to the distance from the epicenter for that seismograph. The epicenter is somewhere along that circle. Do this for three locations. Using data from two seismographs, the two circles will intercept at two points. A third circle will intercept the other two circles at a single point. This point is the earthquake epicenter (Figure 1.1). Of course, its been a long time since scientists drew circles to locate an earthquake epicenter. This is all done digitally now. but its a great way to learn the basics of how locating an epicenter works. Three circles drawn from three seismic stations each equal to the radius from the station to the epicenter of the quake will intercept at the actual epicenter. Click image to the left or use the URL below. URL:
Here are the steps to finding an earthquake epicenter using three seismograms : 1 . Determine the epicenter distance from three different seismographs . The longer the time between the arrival of the P - wave and S - wave , the farther away is the epicenter . So the difference in the P- and S - wave arrival times determines the distance between the epicenter and a seismometer . 2 . Draw a circle with a radius equal to the distance from the epicenter for that seismograph . The epicenter is somewhere along that circle . Do this for three locations . Using data from two seismographs , the two circles will intercept at two points . A third circle will intercept the other two circles at a single point . This point is the earthquake epicenter ( Figure 1.1 ) . Of course , its been a long time since scientists drew circles to locate an earthquake epicenter . This is all done digitally now . but its a great way to learn the basics of how locating an epicenter works . Three circles drawn from three seismic stations each equal to the radius from the station to the epicenter of the quake will intercept at the actual epicenter . Click image to the left or use the URL below . URL :
in order to locate the epicenter of an earthquake, you need the distance to the epicenter from at least __________ stations.
in order to locate the epicenter of an earthquake , you need the distance to the epicenter from at least _ _ _ _ _ _ _ _ _ _ stations .
three
three