Tag

Tohoku

All articles tagged with #tohoku

Powerful M6.9 quake jolts northern Japan; no tsunami warning issued
world2 months ago

Powerful M6.9 quake jolts northern Japan; no tsunami warning issued

A magnitude-6.9 earthquake struck northern Japan with an epicenter about 50 km offshore from Iwate Prefecture. Hashikami in Aomori reported upper-6 shaking, while parts of Iwate logged upper-5; no tsunami warning was issued. The tremor paused the Tohoku Shinkansen and prompted a government task force. Officials said there are no reported casualties or nuclear facility abnormalities as of now, though there were elevator entrapment reports and the defense minister ordered aerial reconnaissance as a precaution. This is a developing story.

Deep-Earth Wave Shifts Japan 6mm East After Tohoku Quake
earth-science2 months ago

Deep-Earth Wave Shifts Japan 6mm East After Tohoku Quake

GPS data show an eastward, step-like ground shift of up to 6 millimeters across nearly all of Japan about 15 minutes after the 2011 magnitude-9 Tohoku quake. Researchers say a large ScS seismic wave traveled deep into Earth, reflected off the core, and returned to the surface, reactivating plate boundaries and causing the uniform shift—a first suggested observation of this type of wave influencing the surface and with implications for understanding aftershock hazards across subduction zones.