DYNAMIC SUBDUCTION PROCESS OF LOCAL PLATE REVEALED BY IBARAKI EARTHQUAKE SEQUENCE OF 1982 IN JAPAN
Diao Guiling
Wang Qincai
Li Qinzu
Chen Shaoxu
Zhang Sichang
Fu Rongshan
Abstract：The kinematics and dynamics of plate tectonics are the frontal subjects in geoscience, and the strong earthquake occurred along the plate boundary results directly from plate movement. By analyzing Ibaraki earthquake sequence, it has been found that the focal fault plane has a special image of grading expansion and adjustment along the directions of strike and dip, respectively. With the consideration of strike, dip and slip directions of focal mechanism, we have confirmed that Ibaraki earthquake is a thrust fault earthquake occurred under the Japan Trench. The cause of the earthquake sequence is discussed in the paper. The study on the temporal-spatial distribution of the earthquake sequence with a time scale which is between the year-scale spatial geodetic data and the second-scale moment tenser of the strong earthquake has indicated the dynamic process of Pacific plate subduction under the Eurasia plate. According to the average slip distance of earthquake and the velocity of plate movement, it is predicted that a strong earthquake might occur in recent years.
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Publication Date：2001-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 136-142 )