澜沧,耿马震区断层启动系数与大震序列发震断裂研究

在分析构造应力场最大主应力方向和断层走向之间的夹角与断层错动关系的基础上，同时还考虑断层的几何特征，错动性质以及应力场状态等因素，提出以断怪启动系数Ｋ值来定量表征处在相同构造尖力环境中，不同走向的活动断裂的活动程度，并以１９８８年澜沧－耿马大震序鲁为例，计算了大震和强余震震源机制节面的断层启动系数，对震区主要活动断裂在近似情况下也计算了断层启动系数，以此在结合地震破裂带等资料对大震和强余震的发震断

FAULTSTARTING COEFFICIENT IN LANCANG-GENGMA SEISMIC AREA AND SELSMOGENIC FAULT STUDY OF GREAT EARTHQUAKE SEQUENCE

On the basis of analyzing the angles between maximum principal stress of tectonic stress field and fault strikes, as well as the relations of fault dislocation, at the same time considering the fault geometrical features, dislocation property and state of stress field, it is presented that using fault start coefficient K to quantitatively describe active degree of active fault in different strikes located in same tectonic stress environment. Taking seismic sequence of great Lancang-Gengma earthquake in 1988 as an example, the fault start coefficients of source mechanism solutions node surface of great earthquake and strong aftershocks were calculated, the fault start confficients of the main active faults in mainshock area in closer condition were also calculated. On the basis of above and combining with the data of seismic fracture belt, the seismogenic faults of great eqrthquake and strong aftershocks were also analyzed.