Publication Date:
1981-01-01
Description:
Using the two-station-method, average fundamental mode surface-wave velocities and attenuation coefficients have been determined in the Atlantic Ocean. The average Rayleigh-wave attenuation coefficients decrease from 3.04 × 10-4 km-1 at a period of 15 sec to about 0.40 × 10-4 km-1 at the longer periods. The average Love-wave attenuation coefficients, in the period range 26 to 100 sec, vary from a value of about 2.20 × 10-4 km-1 at the shorter periods to a minimum value of 0.92 × 10-4 km-1 at the longest period. Backus-Gilbert inversion theory applied to the attenuation data yields an average Q-1 β model for the Atlantic that shows a clear and well-developed low-Q zone situated approximately between 40 and 220 km depth. The maximum Q-1 β value (~ 13 × 10-3) occurs at 100 km depth. © 1981, The Seismological Society of Japan, The Volcanological Society of Japan, The Geodetic Society of Japan. All rights reserved.
Print ISSN:
0022-3743
Electronic ISSN:
1884-2305
Topics:
Geosciences
Permalink
