ATTEMPT TO DETECT COMBINATION TONES BETWEEN THE EARTH'S FREE OSCILLATION AND THE EARTH TIDE

• Main Authors: タナカ トシユキ, フルモト ムネヨシ, ナワ カズナリ, Toshiyuki TANAKA, Muneyoshi FURUMOTO, Kazunari NAWA
• Format: Report
• Language: English
• Published: Faculty of Science, Kanazawa University 1997
• Subjects: nonlinear elasticity; the earth's free oscillation; the earth tide; combination tone; Syowa Station; Antarc*; Antarctica
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2839; http://id.nii.ac.jp/1291/00002839/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2839&item_no=1&attribute_id=18&file_no=1

When there are two oscillations in a nonlinear system, new oscillations called combination tones appear. We try to detect combination tones between the earth tides and the earth's free oscillations using the long-period seismograms of the Bolivian great deep earthquake on June 9,1994 recorded by a broad band seismometer and a superconducting gravimeter installed at Syowa Station in Antarctica. The results suggest that combination tones between the free oscillations and the semidiurnal tide exist.