Hetta Geophysical Survey

The Hetta 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 in May 1992. A total of 1,707 line kilometers were collected covering 323.3 square kilometers. Line spacing was 200 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. The Hetta survey was flown for the American Copper & Nickel Company, Inc. and provided to DGGS by the Sealaska Corporation. The data were merged and released with the 1999 Ketchikan geophysical survey maps. 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_008_hetta_1992_vector_data	Vector data	52.0 M	Read me
Download gpr2020_008_hetta_1992_maps_prn_format	Plot files	75.8 M	Read me
Download gpr2020_008_hetta_1992_databases_geosoft	Linedata Geosoft format database	28.5 M	Read me
Download gpr2020_008_hetta_1992_images_registered	Image files	1.6 M	Read me
Download gpr2020_008_hetta_1992_grids_geosoft	Gridded data Geosoft format	4.2 M	Read me
Download gpr2020_008_hetta_1992_grids_ermapper	Gridded data ER Mapper	4.1 M	Read me
Download gpr2020_008_hetta_1992_kmz	Google Earth files	10.8 M	Read me
Download gpr2020_008_hetta_1992_documents	Adobe PDF files	1.4 M	Read me
Download gpr2020_008_hetta_1992_maps_pdf_format	Adobe PDF files	126.9 M	Read me
Download gpr2020_008_hetta_1992_profiles_stacked	Adobe PDF files	96.3 M	Read me
Download gpr2020_008_hetta_1992_ascii_data	ASCII tabular files	29.9 M	Read me

Publications

GPR 2020-8. Hetta electromagnetic and magnetic airborne geophysical survey data compilation. Supersedes the Ketchikan geophysics release from 1999
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 Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.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 Superseded by GPR 2020-5, GPR 2020-6, GPR 2020-7, and GPR 2020-8.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 1999-12B. 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 1999-2B. 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 1999-6B. 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 1999-7B. 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 1999-9B. 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 1999-10B. 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 1999-11C. 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 1999-16B. 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 1999-16E. 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 1999-15. 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 1999-3B. 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 1999-8B. 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 1999-12C. 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 1999-1B. 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 1999-4B. 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 1999-5B. 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.