Numerical Modeling of Pn Geometric Spreading and Empirically Determined Attenuation of Pn and Lg Phases Recorded in Eastern Kazakhstan
Abstract
The overall goal of this work is to estimate the detection and location capability of actual and hypothetical networks of stations and arrays in and around the Soviet Union. These estimates require the simulation of the detection and location capability of the networks. This report summarizes two studies of important issues involved in the normalization of the simulations. The first is a theoretical study of the dependence of Pn geometric spreading on the velocity gradient in the upper mantle. This is important because most methods for estimating Pn attenuation require assumptions regarding geometric spreading. The second study is an empirical parameterization of regional wave spectra recorded near the eastern Kazakhstan nuclear explosion test site. The results are compared to results from a similar parameterization of data recorded by the NORESS array in Norway. Data recorded by the NORESS and ARCESS arrays are plentiful and provide an excellent basis for normalizing the simulations. Data recorded in eastern Kazakhstan are relatively few at this time, but can be used to see if the NORESS/ARCESS data can be used as a reasonable representation of conditions in this area. (KR)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1989
- Accession Number
- ADA216864
Entities
People
- Thomas J. Sereno Jr.
Organizations
- Leidos