What is inside here?. Process of Investigation: Teams of Seismologists develop a model of earth’s interior which is to compared to one developed by teams.

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Presentation transcript:

What is inside here?

Process of Investigation: Teams of Seismologists develop a model of earth’s interior which is to compared to one developed by teams of theoreticians.

Theoreticians Seismologist Hypothesis: the simplest solution to the question “What is beneath our feet” is a homogeneous Earth, or one comprised entirely of rock

Seismologist Your task is to help test this hypothesis by analyzing a set of seismograms from a real earthquake to determine how long it takes for the seismic waves released from an earthquake to arrive at various points on Earth’s surface.

Theoreticians Your task is to help test this hypothesis by creating a model of the Earth, using the known velocity of seismic waves in rock ~ 11km/s to predict how long it should take seismic waves to reach various distances around Earth.

Earth’s surface Center of the Earth Scale model of a homogeneous Earth Right Left 180 o

140°

Seismologists Theoreticians

REPLACE WITH YOUR OWN DATA Sample set shown

How does this anomaly in the data translate back to Earth?

Measure the geocentric angle from the epicenter to the anomaly in the data (108 degrees for example). Use your ruler to connect the epicenter to the mark you just drew on Earth’s surface.

Next, repeat this procedure to the bottom of the circle

Like a tree making a shadow, something is blocking the energy. Can we tell what it is?

Cut out this shape from you model

Lay the cut out from Earth A on top of Earth B and trace along its edges (indicated with orange)

Next, rotate the cut out and continue to trace its edges