Electroseismic Determination of Soil and Rock Types.

摘要

A numerical inversion technique was developed for resistivity data but found to be unsuitable for application to data with large errors or data which does not conform closely to the assumptions in the technique. The theoretical development is included since it contains some innovations concerning the modeling of the electrical response of a media with variable resistivity. A field program was carried out to test the feasibility of the measurement of the electroseismic effect. The electroseismic effect is defined in this report as the change in resistivity induced during the passage of seismic waves. Measurements were made in the Wenner configuration at a single location in recent coastal plane sediments of central Georgia. Voltage variations were recorded which could be correlated with the seismic arrivals from two pounds of explosives at about 250feet. Using the theory developed in this report for its interpretation,the electrical response could be used to infer changes in resistivity at depth induced by seismic waves. Measurement of the electroseismic phenomenon is feasible but more research is needed to develop the interpretation theory and test the electroseismic response of different types of rocks.