The myth and reality of the Japanese earthquake 日本大地震的神秘与真相
BACK in January, Japanese seismologists warnedthat the tectonic plates colliding beneath the PacificOcean off the north-east coast of Japan were poisedto slip catastrophically. By their reckoning, there wasa 99% chance of an earthquake of magnitude 8.0occurring off the Miyagi coast, and a 90% chance ofone off Ibaraki prefecture, within the next 30 years.They were surprised only by the sheer size of the magnitude 9.0 monster that was unleashedwhen the plates at last let go on March 11th.
早在今年一月的时候,日本地震学家就曾警告说太平洋洋底日本东北海岸下的板块相互冲撞会导致造成倾斜、引起灾难。根据他们的估计,30年内,宫城县海岸附近发生8.0级大地震的可能性为99%,而茨城县海岸附近的几率则为90%。3月11日板块终于释放能量、发生9.0级强震,地震学家仅仅惊讶震级如此之高。
It seems that, on occasions, the rupture along this particular type of reverse fault can jump acrossgaps and other boundaries along the fissure, linking up with other parts of the fault to extendthe breach alarmingly. The traditional fault-segmentation model used in seismology does notallow for this. But on that fateful Friday, when the North American plate slid over the Pacificplate along a subduction zone running 130km off the Pacific coast of northern Japan,the shock leapt from the first segment to a second and on to a third, extending the fault zonesome 400km and increasing its intensity more than 30-fold. With all the action taking placeonly 24km down, the seabed was thrust violently upwards, triggering huge waves.
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