A Time-Domain Electromagnetic Survey of the East Rift Zone, Kilauea Volcano,Hawaii.

摘要

The purpose of the time-domain electromagnetic survey is: (1) to give greater insight into interpretation techniques of time-domain electromagnetic data;and (2) to present a more complete picture of the geologic structure and hydrology of the Rift,with special emphasis on its geothermal potential. To interpret the time-domain electromagnetic data: (1) the maximum-received voltages are converted to apparent resistivities and mapped; (2) the received transients are matched with a catalog of asymptotic curves; (3) theoretical layered-earth curves are calculated and the transients are again matched;and (4) a least-squares-fit computer program gives a more exact interpretation. A comparison of time-domain electromagnetic results with the results of conventional DC dipole mapping surveys shows that both measurements essentially provide the same resistivity information. Time-domain electromagnetic surveys provide resistivity versus depth information as well.