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根据不同距离的台站记录,详细分析了1974年5月10日云南省永善—大关主震的特性.结果表明此主震具有多重性.可以识别10个以上的震源点,其中7个可以测定其震源参数。 在起始的2—3秒钟内,只发生几次小地震,其能量均不大于5级.此后的60秒钟内出现数个能量相当于7级的几个较强地震. 震源点不规则地分布在线长度约为60公里的范围中.它们似乎是随机地发生在一个脆弱带中,而不象是一个破裂从断层的一端传递到另一端.
Based on the station records of different distances, the characteristics of the Yongshan-Daguan mainshock of Yunnan Province are analyzed in detail on May 10, 1974. The results show that the main shocks are multiple and can identify more than 10 focal points, of which 7 Its source parameters can be determined. Within the first 2-3 seconds, only a few minor earthquakes occur and their energy is no greater than 5. A few more strong earthquakes with an energy equivalent to level 7 occur in the next 60 seconds. Regularly distributed over an online range of about 60 km in length, they appear to occur randomly in a frangible zone rather than as a rupture passing from one end of the fault to the other.