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１９９３年２月２６日和１９９４年９月７日在浙江宁波鄞县发生了ＭＬ３．９和ＭＬ４．７地震。本文使用华东地区部分台站的地震记录资料给出了这两次地震的震源机制和震源参数。其主要结果是：该区的主压应力方向约为北东６００；３．９级地震的破裂方向为ＳＳＷ，破裂速度为２．７ｋｍ／ｓ，破裂尺度为０．３９ｋｍ；４．７级地震的破裂方向为ＮＷＷ，破裂速度为２．３ｋｍ／ｓ，破裂尺度为０．４１ｋｍ。最后讨论了破裂长度异常在强余震预报中的意义。
The ML3.9 and ML4.7 earthquakes occurred in Yinxian, Ningbo, Zhejiang Province on February 26, 1993 and September 7, 1994. Seismic records of some stations in East China are used in this paper to give focal mechanism and source parameters of these two earthquakes. The main results are as follows: The principal compressive stress direction in this area is about 600 North East; the rupture direction of 3.9 Earthquake is SSW, the rupture speed is 2.7km / s and the rupture scale is 0.39km; The rupture direction is NWW, the rupture velocity is 2.3km / s, and the rupture scale is 0.41km. Finally, the significance of rupture length anomaly in prediction of strong aftershocks is discussed.