6.1 Quake Off Iwate; No Tsunami, Nuclear Sites Normal
Get the Geopolitics newsletter
Daily geopolitics — wars, elections, sanctions, the diplomatic moves that move markets. Free.
- Japan Meteorological Agency reported a 6.1-magnitude earthquake at 5:21am local time on June 28 in the Pacific off Iwate prefecture, at a depth of about 40km, with no tsunami warning issued.
- The quake measured lower 5 on Japan's seismic intensity scale of 7 in parts of Aomori and Iwate prefectures, according to the agency.
- Tohoku Electric Power Co. reported no abnormalities at the Higashidori nuclear power plant in Aomori or the Onagawa nuclear power complex in Miyagi Prefecture following the tremor.
- Japan Nuclear Fuel Ltd. also confirmed no abnormalities at the Rokkasho nuclear fuel reprocessing plant in coastal Aomori Prefecture.
- The June 28 quake comes three days after a stronger 7.2-magnitude earthquake on June 25 struck the same region off Iwate at a depth of 44km, measuring upper 6 on the seismic intensity scale in Hashikami, Aomori Prefecture.
- The June 25 quake injured at least 10 people, disrupted bullet train services, and forced schools to temporarily close, per Kyodo News.
Why it matters: This is the second significant earthquake in three days off Iwate — a 7.2-magnitude on June 25 that injured 10 and disrupted rail and schools, followed by a 6.1 on June 28 that nonetheless triggered safety checks at three nuclear facilities (Higashidori, Onagawa, Rokkasho). The back-to-back seismic activity in the same offshore zone keeps north-eastern Japan's nuclear infrastructure under repeated operational scrutiny even at moderate magnitude.
