Big-quake aftershocks still rock Japan
Print Edition
Four years after a magnitude 9 earthquake shook northern and eastern Japan, the region is rocked by tremors at more than double the average rate of the decade before the disaster, a report from the Japan Meteorological Agency shows.
In the latest 12 months there were 737 quakes registering at least 鈥1鈥 on the Japanese intensity scale of 1-7 in the quake zone, which runs about 500 kilometers from Tokyo鈥檚 eastern suburbs up the northeast coast nearly to the northern tip of Honshu island. From 2001 to 2010, data shows, the annual average was 306.
The agency warns that there remains a risk of large aftershocks in the region, which includes the area of the wrecked Fukushima nuclear plant. Scientists say that while the quakes are getting weaker, the numbers are still a concern. Last month alone there were 64 quakes of magnitude 4 or higher in the quake zone. While the Japanese scale measures the intensity of shaking on the surface, with the lowest reading of 鈥1鈥 felt only slightly if at all, magnitude measures the amount of energy released by a quake.
鈥淚n general, when there are a lot of small quakes that means it鈥檚 easier for there to be a larger one as well,鈥 said Shinji Toda of Tohoku University鈥檚 International Research Institute of Disaster Science in Sendai. 鈥淥f course, we can鈥檛 say when.鈥
While the report focused on the northeast, all of Japan is effectively a quake zone where three tectonic plates intersect, generating about one-fifth of the world鈥檚 magnitude 6-plus quakes. In November, a magnitude 6.8 tremor rocked the central Nagano prefecture, injuring 13. Toda said areas such as Fukushima and northwest Akita prefecture, which sits outside the region hit directly by the March 11 quake, are still feeling the impact.
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