Abstract
The VLBI geodetic networks have recently detected a shortening rate of about 6.2 cm/y in the baseline lengths between Kashima station on the Northeast Honshu Arc and the Pacific stations. In the northern part of the Mariana Trough, a change of the backarc spreading rate has been demonstrated through magnetic anomaly analysis. The backarc spreading commenced at about 3.5 Ma with a half spreading rate of 2.5 cm/y, and it has decreased to about 1 cm/y toward the present. These new data are consistent with the first law of the convergence rate of plates proposed by Otsuki (1989), thus supporting its validity.
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