龙门山断裂带晚第四纪以来大型古地震滑坡时空分布规律与古地震事件反演

我国地震活动强烈，强震区范围广且地震滑坡灾害严重。2008年汶川Ms8.0地震和2013年芦山Ms7.0地震表明，以往对龙门山断裂带地震危险性的认识明显不足。当前，关于汶川地震滑坡机理及震后灾害链等方面的研究较多，而有关古地震滑坡及相关古地震事件反演的研究还很少。以龙门山断裂带的大型古滑坡为研究对象，综合分析汶川地震滑坡、古地震滑坡和古地震探槽信息，拟开展龙门山断裂带晚第四纪以来大型古地震滑坡时空分布规律与古地震事件反演的研究，具体研究内容包括：1）大型古滑坡的地貌学识别与空间分布规律；2）大型古地震滑坡的多学科判定与时间序列特征；3）基于古地震滑坡和汶川地震滑坡数据的古地震年代序列与强度反演；4）基于古地震滑坡和古地震探槽相互验证的大震复发周期厘定。相关研究成果可为龙门山地区的地震预测预报、地震危险性区划和重大工程建设选址提供科学依据，具有重要的理论意义和社会经济价值。

China has strong earthquake activity, wide distribution of high intensity and catastrophic earthquake-induced landslides. The occurrence of the 2008 Wenchuan Ms 8.0 earthquake and the 2013 Lushan Ms 7.0 earthquake show that the previous acknowledge on the seismic risk of the Longmenshan fault zone is rather insufficient. Nowadays, many studies focus on the mechanism of earthquake-induced landslides and their hazard chains, but few on the paleoseismic landslides and their reversion on related paleoearthquakes. Aiming at large paleolandslides, integrating information from landslides induced by the Wenchuan earthquakes and by paleoearthquakes and the paleoseismic trenches, the project intends to restore the spatial-temporal distribution of large paleoseismic landslides and make inversion on the paleoearthquakes since late Quaternary in the Longmenshan fault zone. The specific researches include: 1) geomorphologic identification and spatial distribution of the large paleolandslides; 2) multidisciplinary recognition of seismic origin of the large paleolandslides and definition of their temporal sequences; 3) temporally paleoseismic sequences and magnitude inversion on the basis of data from landslides induced by Wenchuan earthquakes and by ancient events; 4) determination of recurrence interval of large earthquake on the mutual verification of paleoseismic landslides and paleoseismic trenches. The relevant results can provide scientific basis for earthquake prediction, seismic risk zoning and location of major projects in Longmenshan area, being important theoretical significance and social-economic value.