Fernando Martínez Torres (1,2) and Gavin Hayes (3) 1.RESESS Program-UNAVCO, 2.University of Puerto Rico at Mayaguez,

3.Unites States Geological Survey

Abstract The ability to visualize the geometry of subduction zones is essential for understanding aspects of the rupture process of an earthquake. In this study we are working with Slab 1.0, a three-dimensional model of global subduction zone geometries. In this study, we compare the existing models with models compiled from regional studies, gathered from geosciences literature, which may contain more accurate data and can thus help us to improve Slab 1.0.

Results Methods

!!!!!!!!!!!!!!!!!!!!!!!!!●!Identify published regional data and models. !!!!!!!!!!!!!!!!!!!!!!!!!●!Chose random points along the contour lines. !!!!!!!!!!!!!!!!!!!!!!!!!●!Digitize slab geometry ● Compare Slab 1.0 model to regional model.

Alaska

Slab 1.0 vs. Regional

Peru to Chile

Conclusion & Future work ●!By quantifying the differences between these models and by assessing the reasons for those differences we can identify areas where Slab 1.0 models can be improved. ●!This project is one step in a long term project ●!Add more regional data to Slab 1.0

Acknowledgements The RESESS program is administered by UNAVCO, a NSF and NASA funded research consortium, in partnership with Incorporated Research Institutions for Seismology (IRIS) and the United States Geological Survey (USGS) in Golden, Colorado. Funding for the RESESS program is provided by the NSF Grant GEO-OEDG #0503613. Special thanks to, Valerie Sloan (UNAVCO), Fran Boler (UNAVCO) and Jill McCarthy (USGS).

Figure courtesy of Hayes

Slab 1.0 … is a three-dimensional global model of subduction zone geometries.

Goal We digitize regional models for comparison with Slab 1.0, to improve Slab 1.0 if necessary.

Usually Regional Studies…

!!!!!!!!!!!!!!!!!!!!!!●!Use local networks !!!!!!!!!!!!!!!!!!!!!!●!Data are more complete !!!!!!!!!!!!!!!!!!!!!!●!The accuracy of event

locations is better because the source-receiver travel path is shorter !!!!!!!!!!!!!!!!!!!!!!!●!Regional studies may

employ additional techniques

Models are combine together

Results

North

South

Nicaragua to Panama

Comparison between Cross-section Slab 1.0 and regional model