Midday Mountains - Mahirusanchi

Japanese: 真昼山地 - まひるさんち
Midday Mountains - Mahirusanchi

Located on the border between Iwate and Akita prefectures, this non-volcanic mountain range is part of the Ou Mountains. Between Sengan Pass (894m) in the north and Shiraki Pass (602m) in the south, there are mountains such as Mt. Mokko (1278m), Mt. Waga (1439m), Mt. Yakushi (1214m), and Mt. Mahiru (1059m). It is made up of Tertiary sandstone, shale, and tuff, and small outcrops of volcanic rock and granite can also be seen.

On August 31, 1896 (Meiji 29), the Rikuu earthquake (magnitude 7.5) with its epicenter near Mahirudake caused the Wagagawa Fault on the Iwate Prefecture side and the Mahirudake Fault on the Akita Prefecture side.

[Kano Seiichi]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

岩手・秋田県境にあり、奥羽山脈の一部をなす非火山性山地。北の仙岩(せんがん)峠(894メートル)から南の白木(しらき)峠(602メートル)間にモッコ岳(1278メートル)、和賀岳(1439メートル)、薬師岳(1214メートル)、真昼岳(1059メートル)などの山々が連なる。第三紀層の砂岩、泥板岩、凝灰岩などからなり、火山岩や花崗(かこう)岩の小露頭も散見される。

 1896年(明治29)8月31日、真昼岳付近を震源地とする陸羽地震(マグニチュード7.5)により、岩手県側に和賀川断層、秋田県側に真昼岳断層が生じた。

[金野靜一]

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