基于帕金森矢量的2017年精河6.6级地震震中估计

Evaluation of the 2017 M6.6 Jinghe Earthquake Epicenter Based on the Parkinson Vector

以2017年新疆精河6.6级地震为例,通过收集震中周围不同方位、不同距离地磁台站的连续波形数据,基于帕金森矢量方法及其改进方法,计算每个台站在不同频段的帕金森矢量方位角异常,并分别将同一频段多个台站的异常结果叠加,提取和分析地震前震中周围台站地磁的短周期变化异常特征。结果表明,震前震中周围地磁异常时、空特征明显,均显示短临异常,通过异常综合叠加分析可以较好地估计震中方位。该研究结果对短临地震预报及防震减灾等工作具有一定的参考意义。

This paper uses the 2017 M6.6 Jinghe earthquake in Xinjiang as a case.By collecting continuous waveform data from geomagnetic stations in different azimuths and different distances around the epicenter, based on the Parkinson vector method and the improved method of Chen, we calculate the Parkinson vector azimuth anomalies of each station in different frequency bands. All the vector azimuth anomalies are superimposed by multiple stations in the same frequency band to extract and analyze the short-period variation anomaly characteristics of geomagnetic fields around the epicenter before the earthquake. The temporal and spatial characteristics of geomagnetic anomalies at each station are obvious, and they all show short-term and impending anomalies. The epicenter position can be better estimated through the comprehensive superposition analysis of anomalies. The research results are significant for future short-term and imminent earthquake prediction and earthquake prevention and disaster reduction.