Writing in the January 4 issue of Science, Paul Silver of the Carnegie Institution's Department of Terrestrial Magnetism and former postdoctoral fellow Mark Behn (now at Woods Hole Oceanographic Institution) point out that most of today's subduction zones are located in the Pacific Ocean basin.

研究者指出97视频免费在线，今天我們大多數(shù)的俯沖帶位于太平洋大洋盆地。

Terrestrial magnetism abnormality easy result in compass error but make the machine ship fan sail.

地磁異常容易造成羅盤失誤而使機船迷航在线不卡精品。

Imamura (Ref. 1 , p. 346), a well-known seismologist, wrote as follows in 1937:" attacked with every resource at their command the various problems bearing on earthquake prediction, such as earth tiltings and earth pulsations, variation in the elements of terrestrial magnetism, variation in underground temperatures, variation in latitude, secular variation in topography, etc., but satisfactory results were not obtained".

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