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本文用自由网动态平差法,处理了滇西地区最新水准资料,描述了该区近年来垂直形变场概貌,指出其垂直形变差异分区具有似象限分布特征。通过1981-1983及1983-1985年两个不同时段垂直形变场的对比分析,得出:该区在一九八一年以来的垂直运动的长趋势背景下,以隆起、沉降区所围的鞍部区为中心,各象限小区此起彼伏地波动。在波动初、末伴有5级左右地震发生。最后讨论了“鞍部区”成为孕、发震区的可能因素。
In this paper, we use the free-net dynamic adjustment method to process the latest leveling data in western Yunnan and describe the vertical deformation field in recent years in this area. It is pointed out that the vertical deformation variation sub-area has the quadrant-like distribution characteristics. Through the comparison and analysis of the vertical deformation field between 1981-1983 and 1983-1985 at two different time periods, it is concluded that under the long-term trend of vertical movement since 1981, with the rise and settlement of the saddle District as the center, the quadrants of the area one after another fluctuations. At the beginning of the wave, there were about 5 earthquakes at the end. Finally, it discusses the possible causes of “saddle zone” becoming pregnant and seismogenic zone.