A. Ghosh, EAS, Georgia Tech Distribution of b-value in the Middle America Trench, near Nicoya Peninsula, Costa Rica Abhijit Ghosh A. V. Newman, A. M. Thomas,

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Presentation transcript:

A. Ghosh, EAS, Georgia Tech Distribution of b-value in the Middle America Trench, near Nicoya Peninsula, Costa Rica Abhijit Ghosh A. V. Newman, A. M. Thomas, G. T. Farmer School of Earth & Atmospheric Sciences Georgia Tech

A. Ghosh, EAS, Georgia Tech Outline of the talk Basics of plate tectonics Why this study is important What is b-value… Data processing and results Discussions Summary

A. Ghosh, EAS, Georgia Tech Plate tectonic map

A. Ghosh, EAS, Georgia Tech Plate boundaries

A. Ghosh, EAS, Georgia Tech Why this study is important Lowman and Montgomery, 1998

A. Ghosh, EAS, Georgia Tech Study area: Middle America Trench

A. Ghosh, EAS, Georgia Tech Earthquake catalog

A. Ghosh, EAS, Georgia Tech Seismic network and earthquake location 1-D global velocity model3-D local velocity model

A. Ghosh, EAS, Georgia Tech What is ‘b-value’… : frequency- magnitude distribution log 10 N = a – b. M M = Magnitude of earthquakes N = number of earthquakes equal or greater than M b = slope of the line a = intercept of the line (seismicity rate)

A. Ghosh, EAS, Georgia Tech b-value in the study area b = 1.29±0.03 a = 6.19±0.1

A. Ghosh, EAS, Georgia Tech Spatial variation of Mc

A. Ghosh, EAS, Georgia Tech Spatial variation of b-value

A. Ghosh, EAS, Georgia Tech b-value error

A. Ghosh, EAS, Georgia Tech Interpretation Norabuena et al., 2004

A. Ghosh, EAS, Georgia Tech Summary b-value varies spatially in the Middle America Trench (MAT), near Nicoya Peninsula Anomalously low b-value zone detected May indicate locked part of MAT Supported by independent geodetic model b-value mapping may be used to identify locked portion of subduction zone

A. Ghosh, EAS, Georgia Tech