[DOC] [TLE] Lab 10 - Earthquake Epicenter Location [PAR] The point within the earth where the actual movement takes place is called the ... 
from records made of earthquake waves on devices called seismographs. ... 
Since P-waves travel faster than S-waves do, the seismograph will detect ... The 
time difference, as recorded on a clock, between when the P-waves and S-waves
... [DOC] [TLE] Seismographs - Keeping Track of Earthquakes [PAR] Seismic waves lose much of their energy in traveling over great distances. ... 
tends to remain at rest, and its recording stylus records this difference in motion. 
... Vertical seismographs, like the simple one shown here, use a "soft" link 
between the ... earthquake on a globe is to find the time interval between the P- 
and S-wave... [DOC] [TLE] Earthquakes Waves and Epicenter Location [PAR] The two that you need to know are P-waves and S-waves . ... To find the 
epicenter you need to use atleast three seismograms (diagram 3). ... p-waves 
and the s-waves, calculate the time difference and use the Earthquake P-wave 
and S-wave... [DOC] [TLE] Locating and measuring earthquakes - Putting Down Roots in ... [PAR] The S-wave is slower but larger than the P-wave and does most of the ... 
Scientists have used knowledge of the differences between these and other 
seismic waves to ... latitude and longitude of a point, but the earthquake is bigger 
than that point. ... Using recordings from seismographs, they measured how fast 
the ground... [DOC] [TLE] Virtual Earthquake - An Introduction - Virtual Courseware [PAR] Most earthquakes take place along faults in the upper 25 miles of the earth's ... 
shock waves (seismic waves) to radiate from their point of origin called the focus 
and ... Within the earth, P waves can travel through solids and liquids, whereas S 
... The speed of an earthquake wave is not constant but varies with many factors. [DOC] [TLE] Locating the Epicenter of an Earthquake [PAR] Triangulation is one method scientists use to locate the epicenter of an 
earthquake. ... Earthquakes can occur at any point on the circle, however, when 
three ... Each type of wave travels at a different speed. ... The difference between 
the arrival times of P and S waves is used to find the location of the earthquake's 
epicenter. [DOC] [TLE] Seismic Waves [PAR] P waves shake the ground in the direction they are propagating, while S ... Earth, 
the ratio between the average speeds of a P wave and of its following S wave is 
quite constant. ... One seismograph station, having three different pendulums 
sensitive to the ... The pricipal use of seismograph networks is to locate 
earthquakes. [DOC] [TLE] Seismic wave - Wikipedia [PAR] Seismic waves are waves of energy that travel through the Earth's layers, and are 
a result of ... Earthquakes create distinct types of waves with different velocities; 
when ... of seismic waves, one can make a broad distinction between body 
waves, ... S-waves are slower than P-waves, and speeds are typically around 60
% of... [DOC] [TLE] Locating the Epicenter and Determining the Magnitude [PAR] Locating the Epicenter and Determining the Magnitude of an Earthquake ... the 
variation in distance with the difference of the S and P travel ... not result in an 
exact point for some earthquakes. ... speed of earthquake waves. ... time interval 
between the arrival of the P- and S- waves. Next, use these time intervals and the
. [DOC] [TLE] CHAPTER EIGHTEEN (Earthquakes) [PAR] The focus of an earthquake is the point at which the slip is initiated. 5. ... Figure 
18.5: The seismic waves generated by earthquakes are recorded using 
seismographs, ... Unlike P-waves, shear waves cannot travel through liquids or 
gases. 6. ... travel, the wider becomes the interval between the arrival of the 
different waves. [DOC] [TLE] BBC - GCSE Bitesize: Seismic waves [PAR] These waves can be detected using seismographs. ... the location of an 
earthquake by calculating the time difference between the arrival

Question: Seismographers use the difference in speed between P waves & S waves to locate this point
Answer: the epicenter