基于震源机制解的新疆地区地震烈度衰减关系研究

SEISMIC INTENSITY IN XINJIANG BASED ON FOCAL MECHANISM SOLUTION RESEARCH ON ATTENUATION RELATIONSHIP

收集1716—2022年130次有烈度数据的破坏性地震事件,补充近期新疆区域破坏性地震烈度数据,对124幅地震烈度图,281对烈度圈长、短轴数据进行分类整理。采用数学方法拟合了新疆地区不同时间节点、不同震源机制解地震烈度衰减模型。研究发现,在烈度衰减过程中,走滑型和逆断型地震略有不同,不同的地震震源破裂性质会影响烈度衰减关系的长短轴,因此,我们可以将其作为修正因子,用于快速评估地震灾害的烈度影响场,在地震发生后,修改和完善烈度圈的长短轴数据,以便更准确地进行评估。

Collect 130 destructive earthquake events with intensity data from 1716 to 2022,supplement the recent destructive earthquake intensity data in Xinjiang,and classify 124 seismic intensity maps and 281 pairs of intensity circle long and short axis data.The mathematical method is used to fit the seismic intensity attenuation model of different time nodes and different focal mechanisms in Xinjiang.It is found that in the process of intensity attenuation,strike-slip and reverse-fault earthquakes are slightly different.Different seismic source rupture properties will affect the long and short axes of intensity attenuation relationship.Therefore,we can use it as a correction factor to quickly evaluate the intensity influence field of earthquake disasters.After the earthquake occurs,the long and short axis data of the intensity circle can be modified and improved to evaluate more accurately.