Shear-wave Splitting Tomography in the Central American Mantle Wedge Geoffrey A. Abers Boston University J. Marino Protti, Victor Gonzalez OVSICORI Wilfried Strauch, Pedro Perez, Allan Morales INETER David L. Abt Karen M. Fischer, Laura Martin Brown University AGU 2005 Fall Meeting Session: T31D 12/7/05 0900 TUCAN Tomography Under Costa Rica And Nicaragua NSF- Margins
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Shear-wave Splitting Tomography in the Central American Mantle Wedge
TUCAN T omography U nder C osta Rica A nd N icaragua NSF-Margins. David L. Abt Karen M. Fischer, Laura Martin Brown University. AGU 2005 Fall Meeting Session: T31D 12/7/05 0900. Shear-wave Splitting Tomography in the Central American Mantle Wedge. Geoffrey A. Abers - PowerPoint PPT Presentation
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Shear-wave Splitting Tomography in the Central American Mantle Wedge
Geoffrey A. AbersBoston UniversityJ. Marino Protti, Victor GonzalezOVSICORIWilfried Strauch, Pedro Perez, Allan MoralesINETER
David L. AbtKaren M. Fischer, Laura MartinBrown University
AGU 2005 Fall MeetingSession: T31D12/7/05 0900
TUCAN
Tomography
Under
Costa Rica
And
Nicaragua
NSF-Margins
TUCAN Seismic Array
• 48 IRIS/PASSCAL Broadband Seismic Stations
• 20 Month Deployment (August 2004 - March 2006)
• Close Station Spacing (10 - 50 km)
• Excellent Data Recovery Rate (>95%)
Shear-wave Splitting Tomography
Shear-wave Splitting Tomography
Why Central America?
• Large along arc geochemical variations
• Different melting environments?
• Compare geochemical models with seismic imaging results (e.g., VP, VS, VP/VS, Q, Anisotropy)
STUDY AREA
e.g., Carr (1984); Carr et al. (2003); DeMets (2001); Roggensack (2001); Walker et al. (2001)
NOAA National Geophysical Data Center
Shear-wave Splitting Tomography
Objective:
Method:
Preliminary Results & Implications…
Help constrain flow, melt and volatile distribution by modeling anisotropic structure in the wedge