...Madagascar and the Madagascar Ridge, Mozambique Plateau, Mascarene Ridge, Chagos-Laccadive Ridge, 90°E Ridge, Broken Plateau, Kerguelen Plateau, and Prince Edward Crozet Plateau have granite continental crust and no seismic sources. On the other hand, the Mid-Indian Ridge, which runs north-south through the center, and the ridges that branch off to the southwest and southeast at its southern end, as well as the Carlsberg Ridge, which turns northwest and continues to the Gulf of Aden, have basaltic oceanic massifs and are shallow earthquake sources, and are considered to be ocean-floor spreading axes. These ridges are cut by six major north-south fracture zones and two or more east-west fracture zones. ... *Some of the terminology that refers to the "Carlsberg Ridge" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…マダガスカルをはじめ,南方に続くマダガスカル海嶺,モザンビーク海台,マスカリン海嶺,チャゴス・ラカディーブ海嶺,東経90度海嶺,ブロークン海台,ケルゲレン海台,プリンス・エドワード・クロゼ海台などは,花コウ岩質の大陸型地殻をもち,地震源をもっていない。他方,中央を南北に走るインド洋中央海嶺と,その南端で南西と南東へ枝分れする海嶺,あるいは北西へ転じてアデン湾に続くカールズバーグ海嶺は玄武岩質の海洋型地塊をもち,浅発地震源となっており,大洋底拡大軸と考えられている。これらの海嶺は南北性の,おもなものだけでも6本に及ぶ断裂帯,2本以上の東西性断裂帯で切られている。… ※「カールズバーグ海嶺」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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