强冷空气对宁波地震台垂直摆记录影响

摘要

宁波地区历史记录以来最强冷空气过境，引起VS垂直摆记录不规则抖动，本文选取气压变化数据和扰动时段垂直摆观测数据，对VS垂直摆记录资料进行矢量、差分和精度分析，分析发现：气压变化和垂直摆产生扰动时段一致，差分值最大变化是正常变化的2.7—2.9倍，且相位滞后明显。此研究冷空气对VS垂直摆的影响特征和机制提供新的解释。%It is recorded that the vertical pendulum trembles irregularly as the strongest cold air pass through Ningbo area. In this paper, the air pressure variation data and the observation data of vertical pendulum during the disturbed period are selected for vector, difference and precision analysis. The results show that the disturbance of air pressure and vertical pendulum records are accordance in time. The maximum change of difference value is 2.7—2.9 times larger than the normal change and with phase delay. This study provides new interpretation of the feature and mechanism of the inlfuence of cold air on vertical pendulum observation.