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A Mathematical Model for Predicting Microseismic Signals in Terrain Materials

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Date

1973-06

Authors

Lundien, Jerry R.
Nikodem, H. J. (Hansjoerg J.)
Mobility and Environmental Systems Laboratory (U.S.)

Journal Title

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Publisher

Mobility and Environmental Systems Laboratory (U.S.)
U.S. Army Engineer Waterways Experiment Station

Abstract

The mathematical model presented herein allows the user to make predictions for the wave amplitude and frequency content of microseismic signals that would interact with a seismic intrusion detection device at the surface of the ground. These signals arc propagated as a result of a force applied to the surface of a medium (stress) which in turn causes a corresponding motion to travel away from the source. Efforts were made to keep the operation of the model as general as possible such that little restriction is placed on either the source of the seismic signal or the ground media through which the signal propagates. As a result, the source signal is needed in the form of a time domain stress signal at the points of contact on the ground. The ground media can have any seismic profile that can be approximated by a layered viscoelastic structure. Exwnples are given of two sites to illustrate the variation in predicted signals due to multiple mode Rayleigh wave propagation, varying damping factors, varying ranges from the source, and input stress signal shapes.

Description

Technical Report

Keywords

Microseisms--Mathematical models

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