Although there is increasing evidence that fluids may play a significant
role in the earthquake rupture process, direct observation of fluids in active fault
zones remains difficult. Since the presence of an electrically conducting fluid, such
as saline pore water, strongly influences the overall conductivity of crustal rocks,
electrical and...
Magnetotelluric exploration has been used to image along strike variations in the electrical resistivity structure of the San Andreas Fault at Parkfield, California. A low resistivity wedge extending to a depth of several kilometers is continuous over a horizontal distance of 8 km. The base of the wedge is coincident...