GEOL 240Lg 1st Edition Lecture 15 Outline Current Lecture I Interpreting Seismograms Just What Happened in that Earthquake Anyway II Maps III Diagram of Seismograms continuation Current Lecture I Topic Earthquake Focal Mechanisms II Earthquake focal mechanisms displayed as these characteristic beach ball plots are a simple way of representing the types of faults in areas of active tectonics III This display gives a brief introduction to interpreting the beach ball patterns conventionally illustrated on maps IV Move the cursor over the index on the left to see the diagrams V Seismologists refer to the direction of slip in an earthquake and the orientation of the fault on which it occurs as the focal mechanism VI They use information from seismograms to calculate the focal mechanism and typically display it on maps as a beach ball symbol VII This symbol is the projection on a horizontal plane of the lower half of an imaginary spherical shell focal sphere surrounding the earthquake source A
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