摘要
在塔吉克斯坦—新疆３５条全新世活断层中，２４条发生过２次以上古地震，发生７．０级以上古地震的平均复现期为３２４２±５５年。阿尔金活动断裂带是最活跃的断层，其古地震平均复现期为４１７±５５年。将每条活断层的古地震复现期与最后一次７．０级以上地震发生的时间相比，巴里坤纸房—秦大汉活断层、托里活断层、沙湾独山子—安集海活断层、霍尔果斯活断层及吐鲁番盆地中央活动断裂带为预警式活断层，有发生７．０级以上地震的危险，即未来北天山地震带与西准噶尔—阿尔泰地震带是有强震危险的地震带。这两条地震带的古地震复现期一般比南天山地震带与帕米尔—阿尔金山地震带长。４条地震带的古地震平均复现期为５８９±２年。
There are 35 Holocene active faults in Tadzhikistan and Xinjiang ofChina. 24 ofthem are related with paleoearthquake activity. Atleast2 paleoearthquakeseveroccurred on each ofthem . The av- erage recurrence period ofM≥7.0 events is about3 242±55 years.The Altun active faultzone is m ost active, justw ith a paleoseism ic recurrence period of417±55 years.Based on the com parative results ofthe paleoseism ic recurrence period ofevery active faultand the tim e ofits lastquake, the Zhifang- Qindahan faultin Balikun county, Tuoliactive fault, Dushanzi- Anjihaiactive fault in Shawan county,Huoerguosactive faultand centralactive faultzone in Turpan Basin are believed as prew arning activefaults, w ith the risk ofM≥7.0 earthquakes.Thism eansthatthere willbestrong earthquakes to occur in North Tianshan and w estJungeer-Altay seism ic zones.The recurrence peri- ods ofpaleoearthquakes on these 2 zonesare longer than those on South Tianshan and Pam ir- Al- tun seism ic zones. The average recurrence period ofpaleoquakes on these 4 seism ic zones is 589±2 years.Butthatin Tadzhikistan-Xinjiang is only 139±1 years.
出处
《内陆地震》
1998年第2期161-166,共6页
Inland Earthquake
关键词
地震危险性分析
古地震
活断层
地震活动
新疆
Seism ic risk analysis Paleoearthquake Earthquake recurrence period Holocene Activefault Xinjang Tadzhikistan
