异常追踪分析表明，此次突跳变化除与包头西6．4级地震有关外，可能还反应了华北地区应力场的增强过程。
The trace analysis for the anomaly showed that the catastrophic jumps may show the strengthening process of the stress field in North China, except that it related to the M 6 4 earthquake at Baotou.
经由雁门关北上的商人有很多活跃在张家口、多伦、归化城、西包头、丰镇等处。
Many of them did their business actively in cities north of Yanmenguan, such as Zhangjiakou, Duolun, Guihua, West Baotou, and Fengzhen.
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