用多普勒效应研究中小地震的破裂面和破裂传播速度

利用近年来云南省盐源一带3.5——5.0级地震资料,根据它们P波在初动半周期中表现出的多普勒效应,确定了这些地震的破裂面和破裂传播速度。结果表明,其破裂面与当地的地质构造的走向一致。 由文中分析可知,对于本文所研究的中小地震而言,用单侧破裂模式描述其破裂过程比圆盘模式更为合适。在这个结果的基础上,作者进一步求出了这些地震的震源尺度。 

A STUDY OF THE RUPTURE SURFACES AND VELOCITY OF PROPAGATION OF RUPTURE OF SMALL AND MEDIUM SIZE EARTHQUAKES BASED ON THEIR DOPPLER EFFECT

Using the data of the earthquakes of magnitudes 3.5 to 5.0 occurred in the Yanyuan region, Yunnan Province in recent years, the Doppler Effect as shown by the first half period of the P waves from those earthquakes has been based upon to determine the rupture surfaces and the propagation velocities of the ruptures. The results show that the rupture surfaces coincide quite well with the regional tectonic lines.From our analysis, we can see that it would be better to use the unilateral rupture model than the bilateral one for describing the ruptures of the small and medium size earthquakes studied. Basing on the above results the source dimensions of these earthquakes were estimated.