Preliminary Definition of Geophysical Regions in Western Eurasia

摘要

We present a regionalized crustal model of Western Eurasia, WEA. The model is constructed using results from published studies and maps of geological and geophysical parameters in this region, and was developed in conjunction with the updated regionalization of Middle East and North Africa by Walter et al. (2000). As this is the first realization of our Eurasian modeling effort, we have limited ourselves to only twelve broad regions. Particular attention has been given to identifying the boundaries for each region. The main use of this model will be to assist in monitoring the Comprehensive Nuclear Test Ban Treaty (CTBT). Specifically, this model will help us to calibrate and predict the travel time and amplitudes of various regional seismic phases and to locate events accurately. Our model based approach allows us to readily calibrate both the seismic and the aseismic parts of western Eurasia. Each region is specified by an one- dimensional model of compressional and shear velocities, densities and layer thicknesses.