2020年1月19日新疆伽师MS6.4地震烈度分布及房屋震害特征

以2020年1月19日伽师M S6.4地震现场烈度调查结果为基础,综合余震分布、发震构造及仪器烈度值等研究成果,确定了本次地震的烈度分布。此次地震极震区烈度为Ⅷ度(8度),Ⅵ度(6度)区及以上总面积为7599 km 2。分析各个烈度区内不同结构房屋的震害,结果表明,震害较重房屋主要是由于这些房屋年久失修,施工质量不高,缺乏必要的抗震措施等自身原因造成的,其中没有抗震措施的砖木结构房屋是震害主体。随着新疆地区农村房屋的抗震性能提高,在以后的地震烈度调查中,需要现场调查人员依据不同结构房屋的破坏等级及平均震害指数等参数综合判定调查点的烈度值,在没有明显震害的低烈度区,仪器烈度值将会成为烈度图绘制的重要依据。

SEISMIC INTENSITY DISTRIBUTION AND HOUSE DAMAGE CHARACTERISTICS OF JIASHI Ms 6.4 EARTHQUAKE IN XINJIANG ON JANUARY 19TH,2020

Based on the field intensity survey results of Jiashi M S6.4 earthquake on January 19,2020,and the scientific results of aftershock distribution,seismogenic structure and instrument intensity value,the intensity distribution of this earthquake is determined.The intensity of the epicentral area of this earthquake is VIII degree(8 degree),and the total area of VI degree(6 degree)area and above is 7599 km 2.The results show that the buildings with different structures in each intensity area are mainly caused by their own reasons,such as the long time of disrepair,the low quality of construction and the lack of necessary anti-seismic measures.With the improvement of seismic performance of rural houses in Xinjiang,in the future seismic intensity survey,it is necessary for the field investigators to comprehensively determine the intensity value of the survey points according to the damage level of different structural houses and the average earthquake damage index and other parameters.In the low intensity area without obvious earthquake damage,the instrument intensity value will become an important basis for the intensity map drawing.