1. Geotek Alaska, Inc., 907 Dowling Rd., Anchorage, AK 99511Email:
2. Now at United States Geological Survey, 4210 University Dr., Anchorage, AK 99508
3. Sensors & Software, 1040 Stacey Ct., Mississauga, ON L4W 2X8
4. Boise State University Department of Geosciences, 1910 University Dr., Boise, ID 83725