中国大陆活动断裂大震复发间隔
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摘要
通过重新编制活动断层定量参数数据库,利用中国大陆活动断裂定量资料评估了中国大陆活动断裂(段)的大震复发间隔,给出了青藏、新疆、华北3个构造区的大震复发间隔分布特征。研究结果表明,青藏高原活动断裂M7.5级以上大震复发间隔远小于华北和新疆。青藏高原从几100a到2000a,而华北和新疆则从2000a到5000a。大震复发间隔与断层滑动速率成反比,边界断裂的大震复发间隔通常比块体内部断裂短,比例关系大体为1:1.5—2.0。大震复发间隔与断裂性质相关,走滑断层的复发间隔小于逆走滑断层,逆走滑断层小于逆断层,比例关系大体为1:1.5—2.5。现有的定量数据汇编成果和大震复发间隔估计以及统计结果,既可作为地震危险性分析的重要参数,又可作为构造类比研究的参考信息。
By recompiling quantitative parameters database, we reassessed the large earthquake recurrent intervals along active faults in mainland China. We also obtained the large earthquake intervals distribution characteristics of active faults in Qinghai-Tibetan, Xinjiang and Northern China. The results show that the recurrent intervals of MS 7.5 earthquake along active faults in Qinghai-Tibetan that is about several hundreds to 2000 years are much smaller than that of 2000 to 5000 years in Northern China and Xinjiang. The earthquake recurrent intervals are inversely proportional to the slip rate of faults. Generally, the large earthquake recurrent intervals of boundary faults are smaller than that of the faults within blocks, with a proportion about 1:1.5 to 2.0. The large earthquake recurrent intervals are also related to the type of faults, for example, strike slip faults have smaller recurrent intervals than that of reverse-strike slip faults, and reverse-strike slip faults have smaller recurrent intervals than that of reverse faults, with a proportion about 1:1.5 to 2.5. The recompiled quantitative parameter database may provide useful references not only for seismic hazard analysis, but also for the tectonic background study.
By recompiling quantitative parameters database, we reassessed the large earthquake recurrent intervals along active faults in mainland China. We also obtained the large earthquake intervals distribution characteristics of active faults in Qinghai-Tibetan, Xinjiang and Northern China. The results show that the recurrent intervals of MS 7.5 earthquake along active faults in Qinghai-Tibetan that is about several hundreds to 2000 years are much smaller than that of 2000 to 5000 years in Northern China and Xinjiang. The earthquake recurrent intervals are inversely proportional to the slip rate of faults. Generally, the large earthquake recurrent intervals of boundary faults are smaller than that of the faults within blocks, with a proportion about 1:1.5 to 2.0. The large earthquake recurrent intervals are also related to the type of faults, for example, strike slip faults have smaller recurrent intervals than that of reverse-strike slip faults, and reverse-strike slip faults have smaller recurrent intervals than that of reverse faults, with a proportion about 1:1.5 to 2.5. The recompiled quantitative parameter database may provide useful references not only for seismic hazard analysis, but also for the tectonic background study.
引文
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荆燕,任金卫,2004.利用活断层资料模拟中国大陆及其邻区晚第四纪地壳变形场.地震地质,26(1):71—90.
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谢富仁,张永庆,张效亮,2008.汶川M S
8.0级地震发震构造大震复发间隔估算.震灾防御技术,3(4):337—344.
张永庆,谢富仁,2007.活动断裂地震危险性的研究现状和展望.震灾防御技术,2(1):64—74.
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Schwartz D.P.and Coppersmith K.J.,1984.Fault behavior and characteristic earthquakes examples from the Wasatch and San Andreas fault zones.Journal of Geophysical Research,89:5681—5698.
Shimazaki K.and Nakata T.,1980.Time-predictable recurrence of large earthquake.Geophys.Res.Lett.,(7):279—282.
Wells D.L.and Coppersmith K.J.,1994.New empirical relationships among magnitude,rupture length,rupture width,rupture area,and surface displacement.Seismological Society of America Bulletin,84(4):974—1002.
高孟潭,卢寿德,2006.关于下一代地震区划图编制原则与关键技术的初步探讨.震灾防御技术,1(1):1—6.
荆燕,任金卫,2004.利用活断层资料模拟中国大陆及其邻区晚第四纪地壳变形场.地震地质,26(1):71—90.
任俊杰,张世民,冉洪流,2008.活断层定量资料在大震年发生率评定中的应用.震灾防御技术,3(3):282—291.
谢富仁,张永庆,张效亮,2008.汶川M S
8.0级地震发震构造大震复发间隔估算.震灾防御技术,3(4):337—344.
张永庆,谢富仁,2007.活动断裂地震危险性的研究现状和展望.震灾防御技术,2(1):64—74.
Basili R.,Valensise G.,Vannoli P.,Burrato P.,Fracassi U.,Mariano S.,Tiberti M.M.,Boschi E.,2008.The Database of Individual Seismogenic Sources(DISS),version3:summarizing20years of research on Italy's earthquake geology,Tectonophysics,doi:10.1016/j.tecto.2007.04.014.
Frankel A.,Mueller C.,Barnhard T.et al.,1995.National Seismic Hazard Maps:Documentation June1996.U.S.Geological Survey Open-File Report96-532,Denver:U.S.Geological Survey,1—110.
Frankel A.,Petersen M.,Mueller C.et al.,2002.Documentation for the2002Update of the National Seismic Hazard Maps.Open-file Report02-420,Washington DC:U.S.Geological Survey,2—31.
Petersen M.D.,Frankel A.D.,Harmsen S.C.et al.,2008.Documentation for the2008Update of the United States.
Schwartz D.P.and Coppersmith K.J.,1984.Fault behavior and characteristic earthquakes examples from the Wasatch and San Andreas fault zones.Journal of Geophysical Research,89:5681—5698.
Shimazaki K.and Nakata T.,1980.Time-predictable recurrence of large earthquake.Geophys.Res.Lett.,(7):279—282.
Wells D.L.and Coppersmith K.J.,1994.New empirical relationships among magnitude,rupture length,rupture width,rupture area,and surface displacement.Seismological Society of America Bulletin,84(4):974—1002.
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