岫岩陨石撞击坑的速度结构和抗震性能分析

发布时间：2018-05-07 07:48

本文选题：陨石撞击坑 + 地球物理场　；参考：《震灾防御技术》2015年04期

【摘要】：岫岩陨石撞击坑位于辽东半岛北部低山丘陵地区,直径1.8km,保存完好。由于陨石的撞击和此后的沉积作用在坑内形成了特殊的地貌、地质和地球物理环境,使坑内与坑外的介质在速度方面存在差异,尤其是湖相沉积的软弱淤泥层使得坑底上建造的房屋就像躺在一张巨大的海绵垫上一样,使人们常常感到有微震发生,表明坑底的软弱地层对地面的震动产生了放大作用,严重地影响了地基的稳定性,从而影响到地面建筑物的抗震性能。本文采用高分辨折射探测方法,获得了陨石坑内的速度结构和软弱地层的分布,分析了陨石坑地基的抗震性能,为坑内地基和地面建筑物的地震危险性评价提供了可靠的基础资料。
[Abstract]:The Xiuyan meteorite impact crater is located in the low hill and hilly region of the northern Liaodong Peninsula and is well preserved in diameter 1.8km. Due to the impact of the meteorite and the subsequent deposition, a special geomorphology is formed in the pit. The geological and geophysical environment makes the medium in the pit and outside the pits difference in velocity, especially the weak silt layer of lacustrine deposition. The houses built on the bottom are like lying on a huge sponge cushion, which makes people often feel the occurrence of microearthquakes. It shows that the weak strata at the bottom of the pit have a magnifying effect on the ground vibration, seriously affecting the stability of the ground and thus affecting the seismic performance of the ground buildings. This paper adopts the high resolution refraction detection method to obtain the seismic performance of the ground. The velocity structure and the distribution of the weak formation in the crater are obtained, and the seismic performance of the crater foundation is analyzed, which provides reliable basic information for the seismic hazard assessment of the ground and ground buildings.

【作者单位】：中国地震局地球物理勘探中心;
【基金】：国家自然科学基金项目(40774071和41174078)资助
【分类号】：P315.9;P185.83

【相似文献】