Transcript for Computer Animation of Loma Prieta Aftershocks, segment 09 of 12


This is a map view of the Loma Prieta rupture zone. Aftershocks occurred under both the San Andreas Fault and the smaller Sargent fault. The earthquakes on the Calaveras Fault are normal activity for the Calaveras and are not aftershocks.

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You are still looking at a map view of the aftershock zone, but you will now swing your viewpoint down to a cross section view from the side. Watch the aftershocks thin almost to a line as we pass through the aftershock plane.

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This oblique view shows the aftershock zone from the southeast. In the following animation you will fly over the trace of the San Andreas, keeping your focus centered on the main shock. As you arc up and over the aftershocks, you are looking down along the plane of the fault which dips about seventy degrees from horizontal. From this viewpoint it is clear that many of the aftershocks correlate more with the Sargent fault than with the San Andreas. The complete flight over the length of the rupture zone is repeated twice.

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