摘要
(一)前言 1988年11月6日,云南省西南部澜沧—耿马一带接连发生两次强烈地震。据昆明遥测网测定,第一主震7.6级,发震时刻为11月6日21时03分14秒,微观震中为北纬22°50′、东经99°43′,震源深度13公里。第二主震7.2级,发震时刻为同日21时15分36秒,微观震中为北纬23°23′、东经99°36′,震源深度8公里。两次地震的极震区烈度均为9度,等震线长轴为北西—南东方向。其中7.6级地震9度区沿黑河河谷分布,长32公里、宽4公里;8度区长51公里,短轴18公里;7.2级地震9度区长轴25公里,短轴13公里;8度区长轴50公里,短轴平均22公里。(图1)
This paper briefly introduced the situations of earthquake damages and active structures of the Shuangjiang intensity anomalous area during the Lancang-Gengma earthquake and analysed the geological setting forming the high intensity anomaly. It is thought that the main causes which form the intensity anomaly are the existence of a series of active faults of Quaternary age and the terrace textures in Shuangjiang basin. Finally, the authors considered, through probing the regional stability of the Shuangjiang area combined with its historical earthquake activities, that there is the geological setting producing medium-strong earthquakes though the active level of previous earthquakes was lower in this area.
出处
《云南地质》
1990年第2期134-146,共13页
Yunnan Geology
