【摘要】 芦山地震是龙门山断裂带南段的一次破裂,其性质为角度较低的逆断层,破裂未通到地表,没有形成连续而规模显著的地震断层,但存在断续的地表形变,如公路10~20 cm的垂直位移等,显示地壳缩短及次级构造的微弱变形。本次地震形成了滑坡、崩塌、地裂缝、砂土液化等地震地质灾害。除了同震形成的滑坡和崩塌,震动和变形造成岩土体的松动和不稳定,震后地质灾害成为灾区潜在的威胁。更多还原

【Abstract】 Lushan earthquake MS=7.0 on April 20 is another rupture of Longmenshan Fault in the eastern margin of Tibetan plateau after Wenchuan earthquake MS=8.0 with over 80 thousand dead and missing.The seismogenic fault of Lushan is a low angle thrust fault which did not reach the surface during this quake,and no significant earthquake fault was found on the surface of the macro epicenter.However,small deformation traces such as 10~20 cm offsets of the road scattered along the buried seismogenic fault,indicating the crust shortening and tiny deformation of the secondary structures of the seismogenic tectonics.Landslides,rock falls,collapses as well as fissures and liquefactions were found in the heavy shocked area.Besides the co-seismic landslides and collapses,more potential ones induced by the loosed and unstable rocks and soils shocked during the quake will be a big trouble to the quaked area.更多还原