Ketchikan Geophysical Survey

The Ketchikan geophysical survey is located in southeast Alaska in the Ketchikan area, about 350 kilometers south of Juneau, Alaska. Frequency domain electromagnetic and magnetic data were collected with the DIGHEMV system from February to April 1999. A total of 4750.8 line kilometers were collected covering 1648.6 square kilometers. Line spacing was 400 meters (m). Data were collected approximately 30 m above the ground cover or tree canopy from a helicopter-towed sensor platform ('bird') on a 30-m-long line. The large trees and steep terrain resulted in an average ground clearance of 150 m. In the original 1999 release the Ketchikan survey was merged with data from several adjacent surveys (Kasaan, Hetta, and Dolomi). Map sheets and some of the other files in this data release contain data from adjacent or nearby surveys.

Available Data Metadata Overview
File Name	Data File Format	File Size	Info
Download gpr2020_005_ketchikan_vector_data	Vector data	51.1 M	Read me
Download gpr2020_005_ketchikan_maps_prn_format	Plot files	75.8 M	Read me
Download gpr2020_005_ketchikan_databases_geosoft	Linedata Geosoft format database	196.7 M	Read me
Download gpr2020_005_ketchikan_images_registered	Image files	5.9 M	Read me
Download gpr2020_005_ketchikan_grids_geosoft	Gridded data Geosoft format	5.5 M	Read me
Download gpr2020_005_ketchikan_grids_ermapper	Gridded data ER Mapper	5.4 M	Read me
Download gpr2020_005_ketchikan_kmz	Google Earth files	72.0 M	Read me
Download gpr2020_005_ketchikan_documents	Adobe PDF files	1.4 M	Read me
Download gpr2020_005_ketchikan_maps_pdf_format	Adobe PDF files	155.4 M	Read me
Download gpr2020_005_ketchikan_profiles_stacked	Adobe PDF files	335.2 M	Read me
Download gpr2020_005_ketchikan_ascii_data	ASCII tabular files	203.3 M	Read me

Publications

GPR 2020-5. Ketchikan electromagnetic and magnetic airborne geophysical survey data compilation. Supersedes GPR 1999-10A, GPR 1999-10B, GPR 1999-10C, GPR 1999-10D, GPR 1999-11A, GPR 1999-11B, GPR 1999-11C, GPR 1999-11D, GPR 1999-12A, GPR 1999-12B, GPR 1999-12C, GPR 1999-12D, GPR 1999-13, GPR 1999-14, GPR 1999-15, GPR 1999-16A, GPR 1999-16B, GPR 1999-16C, GPR 1999-16D, GPR 1999-16E, GPR 1999-16F, GPR 1999-16G, GPR 1999-16H, GPR 1999-17, GPR 1999-1A, GPR 1999-1B, GPR 1999-1C, GPR 1999-1D, GPR 1999-2A, GPR 1999-2B, GPR 1999-2C, GPR 1999-2D, GPR 1999-3A, GPR 1999-3B, GPR 1999-3C, GPR 1999-3D, GPR 1999-4A, GPR 1999-4B, GPR 1999-4C, GPR 1999-4D, GPR 1999-5A, GPR 1999-5B, GPR 1999-5C, GPR 1999-5D, GPR 1999-6A, GPR 1999-6B, GPR 1999-6C, GPR 1999-6D, GPR 1999-7A, GPR 1999-7B, GPR 1999-7C, GPR 1999-7D, GPR 1999-8A, GPR 1999-8B, GPR 1999-8C, GPR 1999-8D, GPR 1999-9A, GPR 1999-9B, GPR 1999-9C, and GPR 1999-9D.
GPR 1999-1C. Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-13. Portfolio of aeromagnetic and resistivity maps of selected areas near Ketchikan, southeastern Alaska. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-14. CD ROM containing gridded files and section lines of 1999 geophysical survey data for Ketchikan area, parts of the Craig, Dixon Entrance, and Ketchikan quadrangles, southeastern Alaska. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-9C. Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-11B. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-12A. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-12B. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-1D. Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-2A. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-2B. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-2C. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-2D. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-6A. Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-6B. Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-6C. Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-6D. Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-7A. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-7B. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-7C. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-7D. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-9A. Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-9B. Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-9D. Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-10A. Color shadow magnetic map of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-10B. Color shadow magnetic map of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-10C. Color shadow magnetic map of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-10D. Color shadow magnetic map of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-11A. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-11C. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-11D. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-16A. Total field magnetics and detailed electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, parts of Craig C-1 and C-2 quadrangles. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-16B. Total field magnetics and detailed electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, parts of Craig B-3 and B-4 quadrangles. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-16C. Total field magnetics and detailed electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, parts of Craig B-2 and B-3 quadrangles. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-16D. Total field magnetics and detailed electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, parts of Craig B-1 and B-2 quadrangles. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-16E. Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska (parts of Craig A-2 and A-3 quadrangles). Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-16F. Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska (parts of Craig A-1 and Ketchikan A-6 quadrangles). Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-16G. Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska (parts of Craig A-2 and Dixon Entrance D-2 quadrangles). Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-16H. Total field magnetics and detailed electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, parts of Ketchikan A-6, B-5, and B-6 quadrangles. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-15. CD-ROM containing profile and gridded data and section lines of 1999 geophysical survey data for Ketchikan area, parts of the Craig, Dixon Entrance, and Ketchikan quadrangles, southeastern Alaska. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-3A. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-3B. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-3C. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-3D. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-8A. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-8B. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-8C. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-8D. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-12C. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-12D. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-1A. Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-1B. Total field magnetics of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-17. Project report of the 1999 geophysical survey data for Ketchikan area, parts of the Craig, Dixon Entrance, and Ketchikan quadrangles, southeastern Alaska. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-4A. Flight lines of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-4B. Flight lines of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-4C. Flight lines of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-4D. Flight lines of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island. Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-5A. Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map A - Salt Chuck and Kasaan Peninsula, Prince of Wales Island (diazo film version). Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-5B. Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island (diazo film version). Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-5C. Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island (diazo film version). Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.
GPR 1999-5D. Total field magnetics and electromagnetic anomalies of selected areas near Ketchikan, southeastern Alaska, Map D - western and eastern parts, Gravina Island (diazo film version). Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.