Investigations of Joint Seismic and Electromagnetic Methods for Nuclear TestMonitoring

摘要

This study is designed to develop both linear and non-linear modeling methods forprediction of excitation of atmospheric and seismic disturbances from near surface explosions and earthquake sources in complex media which include strong lateral variability, randomness and non-linear response effects. Comparisons with observations are systematically pursued to evaluate these models and to develop source discrimination methods. In this report we describe examples of non-linear atmospheric excitation by near surface explosions which are carried to ionospheric heights in order to predict fluctuations in ionospheric electron densities and ionization layer positions. These predictions are compared to active EM monitoring by ground stations of ionospheric layer perturbations due to the large amplitude atmospheric waves from surface explosions. We also consider atmospheric turbulent coupling at the earth's free surface and investigate the high frequency seismic noise characteristics resulting from this source using combined seismic and atmospheric modeling. Discrimination of seismic sources, Atmospheric modeling, Seismic waves, Ionospheric waves, 3-D Modeling, Seismic noise.