The EMSLAB electromagnetic sounding experiment.

This paper is an announcement to the geophysical community of a major, multi-institutional electromagnetic sounding experiment called EMSLAB (for Electromagnetic Sounding of the Lithosphere and Asthenosphere Beneath the Juan de Fuca Plate). This effort was carried out in Washington and Oregon from east of the Cascade Mountains to the coast, and seafloor measurements continued to the Juan de Fuca spreading center 300 km offshore. A principal objective of EMSLAB was an investigation of the electrical structure of a subducting slab using seafloor and land measurements. A secondary objective was studies of tidal and other large scale ocean flow.