Research press release


Nature Geoscience

Wedged between plates

東京の下にある太平洋テクトニック・プレートの断片は、この地域で繰り返し起きる大地震の原因かもしれないとNature Geoscience(電子版)に発表された研究が示している。断片はそこで接する様々なテクトニックプレートと混ざってプレート間の摩擦を増加させ地震発生段階が進む。


A fragment of the Pacific tectonic plate beneath Tokyo may be the source of recurring large earthquakes in this region, according to research published online this week in Nature Geoscience. The fragment is jammed between the various tectonic plates that interact there, increasing friction between the plates and setting the stage for earthquakes.

Shinji Toda and colleagues found the discrete fragment by analysing the location and distribution of hundreds of thousands of past earthquakes that have occurred beneath central Japan. They suggest that the fragment broke off the Pacific plate as a result of the resistance of large submarine volcanoes that were present on the plate as it subducted.

The identification of this fragment further complicates the tectonic picture of central Japan, which sits at the boundary of several tectonic plates.

doi: 10.1038/ngeo318


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