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    【题目】当地时间2015年9月16日19时54分，智利伊亚佩尔西北部海域发生8.2级强地震，震源深度约20公里。据此回答下列各题。

    【1】地震发生时，地面上人们的感觉是（ ）

    A. 只有上下颠簸 B. 只有左右摇晃

    C. 先上下颠簸，后左右摇晃 D. 先左右摇晃，后上下颠簸

    【2】此次地震的震源位于（ ）

    A. 软流层 B. 岩石圈 C. 下地幔 D. 地核

    【答案】

    【1】C

    【2】B

    【解析】试题分析：

    【1】地震发生时，由于纵波的传播速度快，传到地面的时间略早。横波的传播速度慢，到达地面的时间略晚。地面上人们的感觉是先上下颠簸，后左右摇晃，C对。A、B、D错。

    【2】地震是地球内部能量 向外释放过程中，岩石圈中的岩层断裂错动，引起地面的震动或位移。根据材料中的震源深度，约20千米，地壳平均厚度约17千米，陆壳平均厚度约33千米，此次地震的震源位于岩石圈，B对。 软流层没有岩层错动，A错。地震发生与下地幔、地核关系不大，C、D错。

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