EARTH SCIENCE
EARTHQUAKES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
By scientist looking around to see where the most damage was created.
|
|
|
By making triangles on a map.
|
|
|
By calculating the difference between the P and S waves in arrival times and determining the distances from at least 3 seismic stations.
|
|
|
By drawing 3 or more random sized circles on a map to see where they intersect.
|
Detailed explanation-1: -Triangulation can be used to locate an earthquake. The seismometers are shown as green dots. The calculated distance from each seismometer to the earthquake is shown as a circle. The location where all the circles intersect is the location of the earthquake epicenter.
Detailed explanation-2: -Finding the Distance to the Epicenter Measure the distance between the first P wave and the first S wave. In this case, the first P and S waves are 24 seconds apart. Find the point for 24 seconds on the left side of the chart of simplified S and P travel time curves and mark that point.
Detailed explanation-3: -Three or more seismograph stations are needed to locate the epicenter of an earthquake through triangulation . Using the arrival-time difference from the first P wave to the first S wave, one can determine the distance from the epicenter, but not the direction.
Detailed explanation-4: -Seismologists use a method called triangulation to locate an earthquake’s epicenter. This method uses the speeds and travel times of seismic waves to determine the distance to the earthquake epicenter.
Detailed explanation-5: -Can the location of an epicenter be determined from the distance between one seismic station and the epicenter? If not, what information is needed? No, you need at least three or more seismic stations.