摘要
应用最大熵谱法分析昌黎地电阻率频谱成分特征,结果表明,地电阻率整点值存在明显日变特征,24 h全日波最强,半日波和1/3日波周期成分次之,主要受气温和固体潮影响。气温升高引起地电阻率下降,固体潮引起地下深层承压水位的日扰动变化,导致地电阻率变动。地电阻率日均值存在显著的"冬高夏低"准年变周期,与降雨量有关,利用褶积滤波法可以较好的去除降雨对地电阻率的影响。
The spectrum characteristics of diurnal and annual variation have been identified by maximum entropy method, based on georesisticity data at Changli Seismic Station, Hebei Province. The study shows that the amplitude of the 24 h diural wave is the largest in georesistivity diural variation, followed in turn by the 12 h semidiural wave and 8 h periodic wave. Georesistivity diural variation is mainly affected by temperture and solid tide. The temperture arising can cause georesistivity to decline. The solid tide can cause disturbance of confined water level, which leads to changing of georesistivity. Georesistivity has significant annual period of higher in winter and lower in summer, which was controlled by rainfall. We can remove the effect of rainfall from georesistivity by convolution filtering method.
出处
《地震地磁观测与研究》
2016年第1期57-62,共6页
Seismological and Geomagnetic Observation and Research
基金
国家自然科学基金(41274079)
中国地震局青年震情跟踪工作任务(2015010403)
关键词
地电阻率
日变
年变
固体潮
降雨量
georesistivity
diurnal variation
annual variation
solid tide
rainfall
