Telluric Survey At Clear Lake Area (Skokan, 1993)
Exploration Activity: Telluric Survey At Clear Lake Area (Skokan, 1993)
|Exploration Activity Details|
|Location||Clear Lake Area|
|Exploration Technique||Telluric Survey|
By far, the greatest effort in the area of Mount Konocti to understand the deep structure and hydrology was accomplished through use of a controlled source transient electromagnetic survey (Keller and Jacobson, 1983 ). A grounded-wire source of 1.1 km in length was energized with a current of 2000 A. Several hundred stations were occupied in an area of 42 miles by 60 miles (Fig. 7). The vertical component of the magnetic field was measured at each of these stations and a one-dimensional inversion technique was used. This one-dimensional inversion (Fig. 8 ) revealed in general a surficial resistive layer with a thickness of 1 km or more. A conductor was mapped beneath the resistive layer; the conductor appears to be associated with hot fractured rock saturated with water. The result was that electromagnetics was able to detail structure and map the hydrology at Mount Konocti. It is interesting that the conductive anomaly is deeper, not more shallow at Mt. Konocti. A conductor, but not a magma chamber, was successfully mapped.
- Catherine K. Skokan (1993) Overview Of Electromagnetic Methods Applied In Active Volcanic Areas Of Western United States