2020年唐山古冶5.1级地震前流体固体潮参数时空变化研究

以2020-07-12唐山古冶5.1级地震为例,探讨流体固体潮参数的时空分布特征与孕震的关系.收集2017-01～2020-07唐山古冶周边16 口井水位整点值资料,通过Baytap-G程序计算分析M2波与O1波潮汐参数,研究M2波潮汐因子随时间变化的趋势及空间分布情况.结果表明:1)唐山古冶地震前,震中附近井水位潮汐...

Study on Temporal and Spatial Variation of Fluid Solid Tide Parameters before the Tangshan Guye Ms5.1 Earthquake in 2020

In order to discuss the relationship between temporal and spatial distribution characteristics of fluid solid tidal parameters and earthquakes, we take the 2020 Tangshan Guye MS5.1 earthquake as an example. We collect and analyze the water level data of 16 wells around Guye from January 2017 to July 2020. The tidal parameters of O1 wave and M2 wave are analyzed by Baytap-G program. This paper mainly studies the trend and spatial distribution of M2 wave tidal factors. The results show that:1) The tidal factors of wells around the epicenter before the Guye earthquake in Tangshan show an upward trend, indicating stress accumulation. 2) Combined with the focal mechanism type of this earthquake, we conclude that the variation pattern of tidal factors in 16 wells around the epicenter is mainly affected by the direction of the main stress of the earthquake, and the tidal factor decreases with the compression in the east-west direction; similarly, the tidal factor increases with the extension in the north-south direction.