鄂尔多斯块体北缘台站水管仪观测质量及同震响应对比分析

Comparison Analysis of Observation Quality and Co-seismic Response of Water Tube Tiltmeter in Seismic Stations on the North Edge of the Ordos Massif

摘要:

针对仪器运行状况和外界环境等影响观测质量的因素，以及台站所处地质构造不同对台站影响的问题，采用位于鄂尔多斯块体北缘的乌加河台、包头台、乌海台2015~2017年DSQ水管倾斜仪的观测资料，对比分析3个台站的年零漂、相对噪声水平M₁、M2波潮汐因子γ值均方差等特征参数，并进行同震响应分析。研究表明，包头台水管仪的观测质量优于其它台站，主要是体现在零漂小、精度高、稳定性好，研究结果为评定水管仪观测质量提供了科学依据。同震响应的延迟时间与震中距相关，最大振幅与震级间呈正相关，与震中距间呈负相关。

Abstract:

In view of the operation condition of the instrument and the factors in the external environment that influence observation quality,and the different characteristic of the geological structure of different stations,we used the observation data of DSQ tube tiltmeters in Wujiahe,Baotou and Wuhai seismic stations on the northern edge of the Ordos massif from 2015 to 2017. We compared the characteristic parameters such as annual zero drift,relative noise level,M₁,M2 wave tidal factor,and carried out co-seismic response analysis. The research shows that the observation quality of the water tube tiltmeter of Baotou seismic station is better than that on the other stations,which mainly reflects in small zero drift,high precision and stability. It provides a scientific reference for the evaluation of the efficiency of the water tube tiltmeter. The delay time of co-seismic response is related to the epicentral distance,and the maximum amplitude is positively correlated with the magnitude and negatively correlated with the epicentral distance.