摘要
基于2013年四川芦山M_(S)7.0地震宏观调查点、调查烈度和强震仪记录数据,采用四川省地震局强震动监测技术组计算得到的各台仪器烈度值,绘制了芦山M_(S)7.0地震宏观调查点与调查烈度等震线和仪器烈度等值线分布图,分析了芦山M_(S)7.0地震的仪器烈度与调查烈度的对应关系。结果表明:仪器烈度与调查烈度有较好的对应关系,仪器烈度Ⅵ度点在调查烈度Ⅵ度以上区域总体占比为88.24%,仪器烈度Ⅶ度点在调查烈度Ⅶ度以上区域内总体占比为81.82%;仪器烈度的等值线高值范围可较好展示出地震灾害的程度;仪器烈度区的空间分布特征可表征芦山M_(S)7.0的发震断裂的控制作用,仪器烈度的等值线区总体呈现沿龙门山断裂带方向相对于垂直方向衰减慢;仪器烈度的等值线区发震断裂上盘影响范围相对发震断裂下盘影响范围大;仪器烈度分布与调查烈度分布既有对应关系又存在差异,这在震后短时间内灾区的震灾信息尚不清楚的情况下,能够快速对可能的震害涉及范围、人员伤亡分布、经济损失和生命线工程等损失作出预估,仪器烈度分布可以为应急救援决策、救灾方案制定和救灾力量部署等工作提供重要依据。
Based on the recorded data obtained from macro survey points,survey intensity and strong motion instrument observation of the M_(s)7.0 Lushan earthquake in 2013,the instrument intensity values at each strong motion station were calculated by the strong motion monitoring technical team of Sichuan Earthquake Agency.The macro survey points were plotted on the isoseismal distribution map of the published survey intensity.The isoseismal distribution map of the instrument intensity was derived from the strong motion records and further calculated.We compared and analyed the relationship between the instrument intensity and the survey intensity of the M_(S)7.0 Lushan earthquake.The results show that:The instrument intensity and the survey intensity shows a good correspondence.The instrument intensity points of VI degrees are included in the area with the survey intensity of VI degrees,and the overall proportion reaches 88.24%.The instrument intensity points of Ⅶ degrees are included in the area above the survey intensity ofⅦ degrees,and the overall proportion reaches 81.82%.The regional scope and extent of the serious disasters caused by the earthquake can be well delineated by the contour range of the instrument intensity.The spatial distribution characteristics of the instrument intensity area are consistent with the control role of the seismogenic fault of the M_(s)7.0 Lushan earthquake.The attenuation of the intensity along the Longmenshan fault zone is slower than that in the vertical direction.The phenomenon is generally shown by the isoline area of the instrument intensity.The influence range of the hangingwall of the seismogenic fault is larger than that of the footwall,which is reflected by the isoline area of the instrument intensity.The control effect of the M_(s)7.0 Lushan seismogenic fault is also reflected in the spatial distribution map of the investigated intensity area.There are both correspondence and difference between instrument intensity distribution and survey intensity distribution.Considering that the earthquake disaster information in the disaster area might not be clear in a short time after the earthquake,the earthquake disaster situation in the disaster area can be quickly studied and judged after the earthquake.The possible earthquake disaster coverage,distribution of casualties,economic losses,lifeline engineering and other losses can be effectively estimated by local instrument intensity.The important basis of instrument intensity distribution is urgently and rapidly provided for emergency rescue decision-making,disaster relief plan formulation,disaster relief force deployment,and so on.
作者
杜方
李俊
江鹏
朱永莉
李萍萍
苏金蓉
梁明剑
吴江
DU Fang;LI Jun;JIANG Peng;ZHU Yongli;LI Pingping;SU Jinrong;LIANG Mingjian;WU Jiang(Sichuan Earthquake Agency,Sichuan Chengdu 610041,China;Zhejiang Earthquake Agency,Zhejiang Hangzhou 310000,China)
出处
《四川地震》
2023年第1期1-11,共11页
Earthquake Research in Sichuan
基金
四川省紧急地震信息服务创新团队(201801)
地震科技星火计划项目(XH211103)
西藏拉萨地球物理国家野外科学观测站研究课题(NORSLS21-04)
地震动力学国家重点实验室开放基金课题(LED2020B02)共同资助。
关键词
芦山M_(S)7.0地震
调查烈度
仪器烈度
强震动
地震灾害
the M_(S)7.0 Lushan earthquake
investigation intensity
instrument intensity
strong motion
earthquake disaster
