Triangulation Method

You were asked to locate the epicenter of a recent earthquake. Which

correct sequence of events should you follow?

i. Determine the difference in the arrival time of S and P waves

recorded from each of the seismological stations.

ii. Use the triangulation method to locate the center.

iii. Obtain data from three different seismological stations.

iv. Determine the distance of the epicenter from the station.

• i, iii, ii, iv

• iii, i, iv, ii

• iii, iv, i, ii

• iv, ii, i, iii

You were provided with data showing the arrival time of the P and

S-waves recorded from three seismic stations. Which of these can

you possibly determine?

• the damage at the focus

• the distance to the earthquake

• the intensity of the earthquake

• the location of the epicenter

From the seismogram, the distance to the epicenter can be

determined by measuring ______________.

• the arrival time of surface wave

• the difference in the arrival times of the P and S-waves

• the ratio of the amplitude of the largest P and S-waves

• the speed of the surface wave

It is an elastic from the earth produced by an earthquake or other means.

• Microwaves

• Radiowaves

• Seismic Waves

• All of the Above

Locating an earthquake's epicenter is important because it will pinpoint _______.

• Active fault line

• Focus

• Plate boundary

• Another epicenter

These are cracks in the earth's crust along which there is a movement.

The point underground where an earthquake originates.

These are waves that always arrive after P waves at seismic recording station.

The point on the surface above the focus and place where the earthquake occurs on the earth's surface.

__________ is a method that uses distance information determined from 3 seismic stations to uniquely locate the epicenter of earthquake.