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四川新疆连发强震 专家:两次地震并不在同一个地震带上
中国日报网8月9日电 据新疆地震局消息,8日晚间至9日清晨,四川九寨沟和新疆精河县分别发生了7.0级和6.6级地震,专家分析,这两次强震虽不在同一地震带上,但动力源是由于印度板块向亚欧板块的挤压。两次较强地震连续发生,也再次说明2008年以来,中国一直处于地震相对频发期。
两次较强地震的连续发生是否有内在联系?中国地震台网中心研究员孙士鋐分析,从动力源上来说,这两次地震的动力源相同,大的背景都是由于印度板块向亚欧板块挤压。
“印度板块每年以4到5厘米的速度向亚欧板块俯冲挤压,使得青藏高原抬升,抬升过程中,青藏高原又向北向东推移挤压,这就造成青藏高原周边地震频发。”孙士鋐说,从具体地震带来说,这两次地震并不在同一个地震带上,九寨沟地震处于龙门山地震带,而新疆精河地震处于天山地震带。
“除了大的动力源相同,四川和新疆接连发生的这两次地震本身并没有实际联系,不过,地震活动都有‘成丛’的特点。”孙士鋐解释称,所谓“成丛”,就是一个大的区域内,地震会在一段时间内相对平静,一段时间内又相对活跃。四川、新疆接连发生较强地震,或许标注着中国又要进入地震相对活跃的一个时段。
(编辑:田阿萌 陈姝)
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