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Elastic Rebound Theory Relaxed Stressed (locked fault) Failure during Earthquake First Motions P-wave Radiation Pattern

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  • Elastic Rebound !

    Theory!

    Relaxed!

    Stressed!

    (locked fault)!

    Failure

    during

    Earthquake!

    First Motions!P-wave Radiation Pattern!

  • Radiation Patterns!•! In seismology we call the direction a

    receiver is from a source the azimuth:!

    source!

    receiver!

    North!

    The azimuth is always measured

    clockwise from North and varies

    between 0 and 360 degrees.!

  • •! Earthquake focal

    mechanisms will

    always have

    variations in

    polarity. Some

    stations will have

    first motion up,

    others first motion

    down.!

  • First Motions: Denali Earthquake!Earthquake Focal Mechanisms!

    Earthquake Focal Mechanisms! Earthquake Focal Mechanisms!

  • Earthquake Focal Mechanisms! Earthquake Focal Mechanisms!

    Earthquake Focal Mechanisms!