2011 Nagano earthquake

The 2011 Nagano earthquake (長野県北部地震, Nagano-ken Hokubu Jishin) was an earthquake that occurred near the border between Niigata and Nagano prefectures at 3:59 JST on March 12, 2011. The depth of the hypocenter was 8 km and magnitude of the earthquake was MJMA 6.7.[1][2]

2011 Nagano earthquake
長野県北部地震
栄村大震災
2011 Nagano earthquake shakemap by JMA
2011 Nagano earthquake is located in Japan
2011 Nagano earthquake
UTC time2011-03-11 18:59
ISC event600540067
USGS-ANSSComCat
Local dateMarch 12, 2011 (2011-03-12)
Local time03:59 JTC
MagnitudeMJMA 6.7
Depth8 km (5 mi)
Epicenter36°59′6″N 138°35′48″E
Max. intensityJMA 6+
Casualties3 dead

The strongest shaking was felt in Sakae, Nagano, where a maximum JMA intensity of shindo 6+ was recorded. Thus, damage due to the earthquake was concentrated in Sakae, and so the earthquake is also called the Sakae earthquake (栄村大震災, Sakae-mura Daishinsai).[3][4] Three people were killed.[5]

Relationship with the Tōhoku earthquake

The earthquake occurred only around 13 hours after the Great East Japan Earthquake, the epicenter of which was located offshore in the Tōhoku region.[6][7] For this reason it is believed that the Nagano earthquake was a remotely triggered earthquake caused by the Great East Japan Earthquake.[8][9]

Since this earthquake occurred immediately after the Tōhoku earthquake, itself an event which caused unprecedented damage, the amount of coverage by mass media of the Nagano earthquake was less than that afforded to the Tōhoku earthquake.[10]

A magnitude 6.0 earthquake occurred in three days later in Shizuoka on March 15, 2011,[11] which was also considered to be an induced earthquake of the Tōhoku earthquake.[9]

References
  1. "気象庁｜報道発表資料". www.jma.go.jp. Retrieved 2021-05-04.
  2. "震度データベース検索". www.data.jma.go.jp. Retrieved 2021-05-04.
  3. "栄村大震災／被災状況 - 長野県 栄村". www.vill.sakae.nagano.jp. Retrieved 2021-05-04.
  4. "栄村地震（長野県北部地震） - 長野県 栄村". www.vill.sakae.nagano.jp. Retrieved 2021-05-04.
  5. "長野、栄村地震１０年で追悼 大震災翌日、３人関連死｜信毎web". 信毎web (in Japanese). 12 March 2021. Retrieved 2021-05-04.
  6. "長野県北部地震、東日本大震災と余震が誘発 京大など仕組み特定". 毎日新聞 (in Japanese). Retrieved 2021-05-04.
  7. "The Great East Japan Earthquake, 11th March 2011 | Features | SnowJapan". www.snowjapan.com. Retrieved 2021-05-04.
  8. "日本列島陸域における誘発地震活動について". 2015-04-26. Archived from the original on 2015-04-26. Retrieved 2021-05-04.
  9. 小項目事典, 日本大百科全書(ニッポニカ),デジタル大辞泉,ブリタニカ国際大百科事典. "東北地方太平洋沖地震とは". コトバンク (in Japanese). Retrieved 2021-05-04.{{cite web}}: CS1 maint: multiple names: authors list (link)
  10. "栄村大震災とは？ 3.11翌日の震度6強 「忘れられた被災地」の現状は". ハフポスト (in Japanese). 2017-03-13. Retrieved 2021-05-04.
  11. 平成23年3月15日22時31分頃の静岡県東部の地震について - JMA


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