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The objective of this work is to help improve seismic monitoring technology through the development and application of advanced multivariate inversion techniques to generate realistic, comprehensive, and high-resolution 3D models of the seismic structure of the crust and upper mantle that satisfy independent geophysical datasets. Our focus is on the region surrounding Iran from the east coast of the Mediterranean in the west, to Pakistan in the east, an area of prime importance to nuclear explosion monitoring (NEM), and a region with adequate calibration events to validate our model and to quantify its accuracy. Specifically, we plan to integrate surface-wave dispersion, receiver function, and satellite and ground-based gravity observations to help constrain the shallow seismic structure in the Arabian-Eurasian collision zone. Building on our earlier work combining receiver functions and surface wave dispersion, and surface-wave dispersion and gravity, we plan to continue to integrate geophysical data sets to create more compatible earth models. We also intend to explore geologically based smoothness constraints to help resolve sharp features in the underlying shallow 3D structure.