额尔齐斯活动断裂带
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摘要
额尔齐斯活动断裂带由５条活动断裂构成，自东向西撒开，延伸约６５０ｋｍ，具右旋走滑逆冲性质。该断裂带自更新世晚期以来均有活动，现今垂直错动速率为６．２５ｍｍ／ａ，右族走滑速率为５ｍｍ／ａ，总滑动速率为８ｍｍ／ａ；自更新世晚期以来右施及垂直错动量均达２０～６０ｍ。１９９０年斋桑７．３级地震、１９３１年富蕴８级地震及更新世晚期的古地震使斋桑—乌伦古断裂、玛因鄂博断裂和额尔齐斯河断裂发生破裂。其中玛因鄂博断裂从全新世中期以来就发生过３次古地震，平均复现期为２８４３±９２ａ。通过玛因鄂博断裂和额尔齐斯断裂的详细研究后认为，断裂带未破裂地段是未来发生大地震的可能地段。
Ertix active fault zone,consisting of five active faults with an extension of about 650 km from east to west,owns characteristics of right-handed strike-slip thrusting. The fault zone has been active since the Pleistocene. Up to now the vertical displacement rate is 6.25 mm/a,right-handed strike-slip rate is 5 mm/a,and total strike-slip rate is 8 mm/a. Since the end of Pleistocene both right-handed and vertical displacement reach 20～60 m. The earthquake of 7.3 grade happened in Zhaisang in 1990,that of 8 grade in Fuyun in 1931 and that of the late Pleistocene led to the fracturing of Zhaisang-Ulungu fault,Mayin Ebo fault and Ertix River fault. Three-time earth-quakes had happened since the middle Holocene on Mayin Ebo fault,with an interval of 2 843±92 a. A detailed study of Mayin Ebo fault and Ertix fault suggests the non-fractured sections of the fault zone be the possible area where large earthquakes may happen.
Ertix active fault zone,consisting of five active faults with an extension of about 650 km from east to west,owns characteristics of right-handed strike-slip thrusting. The fault zone has been active since the Pleistocene. Up to now the vertical displacement rate is 6.25 mm/a,right-handed strike-slip rate is 5 mm/a,and total strike-slip rate is 8 mm/a. Since the end of Pleistocene both right-handed and vertical displacement reach 20～60 m. The earthquake of 7.3 grade happened in Zhaisang in 1990,that of 8 grade in Fuyun in 1931 and that of the late Pleistocene led to the fracturing of Zhaisang-Ulungu fault,Mayin Ebo fault and Ertix River fault. Three-time earth-quakes had happened since the middle Holocene on Mayin Ebo fault,with an interval of 2 843±92 a. A detailed study of Mayin Ebo fault and Ertix fault suggests the non-fractured sections of the fault zone be the possible area where large earthquakes may happen.
引文
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