274：名無しさん＠１２周年：2012/01/03(火) 01:41:55.88 ID:Qi2alO9t0
元日の地震はやばいぞ。
http://www.jma.go.jp/jp/quake/20120101143715391-011428.html
マントルのなかで、沈んでいく太平洋プレートが折れた地震だよ。
M7.0
きわめて深い地震なので、地震波の伝わり方がおもしろく、
遠方ほどよく揺れている。
太平洋のプレートが斜めに沈み込む過程で、７００ｋｍほどの下部が高密度のマントル下部に押さえ込まれ、
プレートが沈み込めなくなっている状態なんだけど、１４時３０分頃、
地下３７０ｋｍで沈み込み側のプレートが破壊されて、一気に沈んで起こった地震だよ。
だから、いまプレートが沈み込む力に逆らっているのは、地殻表層の境界面に過ぎない。
時間あたりの沈み込み量がつっかえ棒を失って急増するので、次の大地震はすぐ起きるし、
浅い逆断層型になる。
とんでもないことになったなあ。
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