Introduction to Shear Wave Splitting

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# Introduction to Shear Wave Splitting - PowerPoint PPT Presentation

Introduction to Shear Wave Splitting. Erin Elliott Guofeng Yuan February 26, 2010. Outline. Concept Definitions History Applications Common Misunderstandings Conclusions . What is Shear Wave Splitting?.

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### Introduction to Shear Wave Splitting

Erin Elliott

Guofeng Yuan

February 26, 2010

Outline
• Concept
• Definitions
• History
• Applications
• Common Misunderstandings
• Conclusions
What is Shear Wave Splitting?
• When a polarized shear-wave enters an anisotropic medium, it splits into two quasi shear-waves (fast and slow).
Shear Wave Splitting (Seismic birefringence)

http://garnero.asu.edu/research_images/anis/garnero_splitting.gif

Definitions
• Microcrack
• Azimuthally Aligned
• Polarization Diagrams
Microcracks

Crack density

Azimuthally Aligned
• the angles that the arrivals or waves make with a reference point are all equal.
• The waves are approximately parallel:

http://en.wikipedia.org/wiki/Azimuth

Polarization Diagrams(Hodograms)
• Displays a 2-D projection of the trajectory of a point moving in space.
• a cross plot of two components of motion over a time window.