Different kinds of seismic sources Green’s function and ...web.gps.caltech.edu/classes/ge162/Ge162_Slides_March1st.pdf · Summary • Different kinds of seismic sources • Green’s
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Summary
• Different kinds of seismic sources
• Green’s function and Representation Theorem
• GFs for several important cases – Acoustic, homogeneous whole space, explosion
– Elastic homogeneous whole space, point forces
Difficulties for “Internal” Sources
• Wave equation not satisfied everywhere – Discontinuity of displacement
– Boundary conditions unknown
• Kinematic description – Distributed slip along fault, u(x, t)
1920s~1960s
Can we find body forces that are equivalent to earthquake faulting, in terms of producing the same seismic responses everywhere?
YES!!!
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