Sonic Properties of Deep Sea Cores from the North Pacific Basin and Their Bearing on the Acoustic Provinces of the North Pacific

摘要

Two hundred and fifty long piston cores of deep-sea sediments from the North Pacific have been analyzed and predictions of their acoustic properties are given. Maps are included that outline submarine physiography, and the regional distribution of turbidites, volcanic ashes and sub-bottom reflecting horizons. Tentative statements are made about the reflectivity of the floor of the North Pacific based solely on a survey of bottom materials. Reliable reflectors occur within a broad zone at the periphery of the North Pacific Basin. They extend 800 miles seaward of Japan, 600 miles southeast of the Kamchatka Peninsula, 400 miles south of the Aleutian Islands, and 1100 miles due west of Oregon. A narrow zone of sub-bottom reflectors (turbidites) surrounds the Hawaiian Ridge. It is at least 80 to 135 miles wide on each side of the ridge. (Author)