[题目][自然灾害与防治] 美国阿拉斯加地区是一个多地震的地区.据统计.阿拉斯加州几乎每年都有一次7级地震.每14年有一次8级或以上级别的地震.1964年3月27日南部的安克雷奇附近的威廉王子湾发生8．5级的强震.虽然其震级高.但造成的人员伤亡和经济损失较小(直接造成9人死亡.约5亿美元经济损失).(1)简析阿拉斯加地区多发地震的原因.(2)� 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】【自然灾害与防治】

美国阿拉斯加地区是一个多地震的地区。据统计，阿拉斯加州几乎每年都有一次7级地震。每14年有一次8级或以上级别的地震。1964年3月27日南部的安克雷奇附近的威廉王子湾发生8．5级的强震，虽然其震级高，但造成的人员伤亡和经济损失较小（直接造成9人死亡。约5亿美元经济损失）。

（1）简析阿拉斯加地区多发地震的原因。

（2）分析阿拉斯加地区地震一般造成人口伤亡和经济损失较小的原因。

【答案】（1）阿拉斯加地区地处板块交界地带（美洲板块与太平洋板块交界处）；地壳运动较活跃，因此地震多发。

（2）人口密度小，人类经济活动分散且规模小。

【解析】

试题分析：（1）考查地震多发的原因。阿拉斯加地区位于美洲板块和太平洋板块交界处，地壳运动活跃，多地震。

（2）考查灾情评价。灾害的损失从人员伤亡、财务损失、资源损失三方面分析，阿拉斯加地区地震人口伤亡少，是因为阿拉斯加纬度较高，人烟稀少。人类活动少，加上经济较落后，所以地震经济损失小。

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