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介绍了计算理论地震图的 F- K方法在不同深度 ,不同震中距 ,不同震源类型的情况 ,表明这种方法在高频区和多层水平层状模型计算效果较好 ,适用于研究中小地震的震源机制。采用 F- K方法得到了发生在腾冲火山区的 3个地震的震源机制 ,结果表明地震 1和地震 2是走滑断裂 ,地震 3是逆断层。 3个地震的主压应力轴基本呈北西向 ,与云南地区主压应力轴方向基本吻合 ,因此 ,推断这 3个地震是构造地震。
This paper introduces the calculation of the F-K method of theoretical seismograms at different depths, different epicentral distances and different source types. It shows that this method is effective in high-frequency region and multi-level horizontal layered model and is suitable for the study of medium and small earthquakes Focal mechanism. F-K method was used to obtain the focal mechanism of the three earthquakes occurred in Tengchong volcano area. The results show that earthquakes 1 and 2 are strike-slip faults and earthquakes 3 are reverse faults. The main compressive stress axis of the three earthquakes is basically northwesterly and basically coincides with the direction of the principal compressive stress axis in Yunnan. Therefore, it is concluded that these three earthquakes are tectonic earthquakes.