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美国太空总署（NASA）周二（23日）公布，火星探测车“洞察号”的超灵敏地震试验仪（SEIS），在火星执行任务时探测到相信为火星地震（Marsquake）的震动信号，是NASA首次在另一星球上，录得地震学上的震颤。

洞察号自去年11月登上火星，展开为期2年的地震学任务。喷气推进实验室指，疑似火星地震的信号于本月4日录得，相等于地球的黎克特制2.5级地震。科学家仍在分析数据，以全面地确定导致信号的来源，但相信震颤来自火星的内部，而非由地壳上的力量如风等所产生。

震动能被探测，是因为火星与地球相比非常宁静。火星并没有地壳板块，而地震活动是由冷却和收缩过程所产生，当这过程中的力量累积并变得强大，便足以破坏地壳。另外，SEIS在上月14日、4月10日及11日，测到数次类似但更微弱的信号。

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