新疆可可托海—二台活动断裂带
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摘要
北北西走向的新疆可可托海－二台活动断裂带长１９０ｋｍ，为晚更新世晚期以来呈右旋逆走滑活动的断裂带，形成了额尔齐斯河与乌伦古河断错水系。该断裂带晚更新世晚期以来右错１ｋｍ左右，最大垂直错动１５ｍ；全新世晚期的右旋走滑速率为８．２３±０．４７ｍｍ／ａ。自晚更新世晚期以来该带发生过７期１７次古地震，平均复现期为１５１１±８９ａ。富蕴县喀依尔提拉分型盆地以南为古地震及１９３１年富蕴８级地震破裂段，长１５９ｋｍ，以北为未破裂段，长２５．５ｋｍ，喀依尔提拉分型盆地为构造障碍点。
The north-northwest trending Kokotokay-Ertai active fault zone in Xinjiang is 190 km long. It has been being a right lateral and reverse slip active fault zone since Late Epileis tocene,and it formed the dislocation drainage system of the Ertix river and the Ulungur riv er. Since Late Epileistocene, this fault zone has right-laterally offset as much as about 1 km,the largest vertical offset is as much as 15m. Its dextral strike-slip rate was 8. 23±0. 47 mm/a during later Holocene. From Later Epileistocene to now there have been 17 times of palaeoearthquakes in 7 stages on the fault zone. The average recurrence interval is 1511±89 a. The broken segment of the palaeoearthquakes and the Fuyun earthquake of 1931 (M8) is to the south of the Kayiert pull-out basin, which is 159 km long; the unbroken segment, is 25. 5 km long to the north of the basin, so the Kayiert Basin is a structural obstacle point.
The north-northwest trending Kokotokay-Ertai active fault zone in Xinjiang is 190 km long. It has been being a right lateral and reverse slip active fault zone since Late Epileis tocene,and it formed the dislocation drainage system of the Ertix river and the Ulungur riv er. Since Late Epileistocene, this fault zone has right-laterally offset as much as about 1 km,the largest vertical offset is as much as 15m. Its dextral strike-slip rate was 8. 23±0. 47 mm/a during later Holocene. From Later Epileistocene to now there have been 17 times of palaeoearthquakes in 7 stages on the fault zone. The average recurrence interval is 1511±89 a. The broken segment of the palaeoearthquakes and the Fuyun earthquake of 1931 (M8) is to the south of the Kayiert pull-out basin, which is 159 km long; the unbroken segment, is 25. 5 km long to the north of the basin, so the Kayiert Basin is a structural obstacle point.
引文
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