The Ascension Island hydroacoustic experiment: purpose, data set features and plans for future analysis

• Main Authors: Harben, P E, Rock, D, Rodgers, A J
• Language: unknown
• Published: 2021
• Subjects: 58 GEOSCIENCES; 98 NUCLEAR DISARMAMENT; SAFEGUARDS; AND PHYSICAL PROTECTION; AMPLITUDES; ATLANTIC OCEAN; ATTENUATION; CALIBRATION; CTBT; ENERGY SOURCES; ISLANDS; MONITORING; South Atlantic Ocean
• Online Access: http://www.osti.gov/servlets/purl/13888; https://www.osti.gov/biblio/13888

Calibration of hydroacoustic and T-phase stations for Comprehensive Nuclear-Test-Ban Treaty (CTBT) monitoring will be an important element in establishing new operational stations and upgrading existing stations. Calibration of hydroacoustic stations is herein defined as precision location of the hydrophones and determination of the amplitude response from a known source energy. T-phase station calibration is herein defined as a determination of station site attenuation as a function of frequency, bearing, and distance for known impulsive energy sources in the ocean. To understand how to best conduct calibration experiments for both hydroacoustic and T-phase stations, an experiment was conducted in May, 1999 at Ascension Island in the South Atlantic Ocean. The experiment made use of a British oceanographic research vessel and collected data that will be used for CTBT issues and for fundamental understanding of the Ascension Island volcanic edifice.