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Seismology: Love Waves and Earthquake Velocity Models, Slides of Geology
The concept of love waves in seismology, their velocity, and how they arrive first in oceans due to being faster than rayleigh waves. The document also mentions the use of inversion techniques by seismologists to determine velocity models that satisfy observed dispersion curves. The document also touches upon the non-uniqueness of models based on surface wave dispersion and references works by stein and wysession (2003) and park et al. (2005).
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2012/2013
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! C
C
0
( ") = K (
0 a
!^ ",^ r )
! V
s V s ( r ) r 2 dr Kernel Earth model From δC/C to δVs/Vs(r): “inversion process”
Love wave group velocity is greater than for Rayleigh waves -‐> Love waves arrive first Both travel faster in the oceans than in the conTnents Seismologists use an inversion technique to determine velocity models that saTsfy observed dispersion curves
Low frequency surface waves and
Earth’s normal modes
From Stein and Wysession, 2003 Shallow earthquake Time in seconds x 100
- After Park et al.,