乌什地震台体应变不同频带对干扰因素的响应特征

RESPONSE CHARACTERISTICS OF BODY STRAIN IN DIFFERENT FREQUENCY BANDS TO INTERFERENCE FACTORS ON WUSHI STATION

形变观测台站建立在地壳表层,处于各圈层的分界面上,不同程度的受到各种影响因素的影响,为研究乌什体应变不同频带对干扰因素的影响特征。利用谱分析研究乌什体应变包含的主要周期成分,并利用别尔采夫滤波及一般多项式拟合分解等方法将乌什体应变测值序列进行分解,研究不同频带下乌什体应变受气温、气压及固体潮的影响因素。结果表明:①水位是乌什体应变月波频带的主要影响因素;②乌什体应变年频带的主要影响因素是温度,且乌什体应变相位滞后气温约314 d;③气压对乌什体应变的影响频带介于潮汐与月波频带之间;④各影响因素与体应变之间均具有较强的线性相关性。

Deformation observation station is established on the surface of the Eart h’s crust,at the interface of various layers,and is affected to varying degrees by various influencing factors.To study the influence characteristics of different frequency bands of Wushi body strain on interference factors.Using spectral analysis to study the main periodic components of Wushi body strain,and using methods such as Bertsev filtering and general polynomial fitting decomposition to decompose the Wushi body strain measurement sequence,the factors affecting Wushi body strain under different frequency bands such as temperature,atmospheric pressure,and solid tide are studied.The results indicate that:①water level is the main influencing factor of the monthly wave frequency band of Wushi body strain;②The main influencing factor of the annual frequency band of Wushi body strain is temperature,and the phase lag of Wushi body strain is about 314 days behind the temperature;③The frequency band of the influence of atmospheric pressure on the strain of the Wushi body is between the tidal and lunar wave frequency bands;④There is a strong linear correlation between various influencing factors and body strain.