Triangulation Finding earthquake’s epicenter using seismograms! In Class Activity (working with shoulder partner is A – OK!)

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Presentation transcript:

Triangulation Finding earthquake’s epicenter using seismograms! In Class Activity (working with shoulder partner is A – OK!)

Focus – the place deep in the crust where the earthquake begins (source of primary and secondary waves)

Epicentre – the surface location directly above the focus (source of surface waves)

Let’s say station #1 knows the earthquake happened 200 kms away.

But 200 kms in what direction?

If a second station reports it as 75 kms away, they can draw a circle and see where it intercepts the first circle.

But that still doesn’t pinpoint the location – it could have happened at either spot where the two circles touch.

But a third station removes all doubt as to where it happened.

Three seismographs are needed to pinpoint the source of an earthquake.

Nomograph Finding Magnitude

In class activity We’re going to find an epicentre of an earthquake in San Francisco Lesson 12 Paper and Pencil activity Let’s do 1 st one together! Walk through it. You and shoulder partner can quietly work on the last 2 seismograms What is the average magnitude of this San Francisco earthquake? Please raise hand when finished. If I saw your work, you can try the links at the bottom of wikispace (Virtual Earthquake)