A discussion on Corioli force effect and aflershock activity tendency of the M=8.1 Kunlun Mountain Pass earthquake on Nov.14, 2001

Following the theory and definition of the Corioli force in physics, the Corioli force at the site of the M=8.1 Kunlun Mountain Pass earthquake on November 14, 2001, is examined in this paper on the basis of a statistical research on relationship between the Corioli force effect and the maximum attershock magnitude of 20 earth-quakes with M≥7.5 in Chinese mainland, and then the variation tendency of attershock activity of the M=8.1 earthquake is discussed. The result shows: a) Analyzing the Corioli force effect is an effective method to predict maximum attershock magnitude of large earthquakes in Chinese mainland. For the sinistral slip fault and the reverse fault with its hanging wall moving toward the right side oftbe cross-focus meridian plane, their Corioli force pulls the two fault walls apart, decreasing frictional resistance on fault plane during the fault movement and releasing elastic energy of the mainshock fully, so the maximum magnitude of aftershocks would be low. For the dextral slip fault, its Corioli force presses the two walls against each other and increases the frictional resistance on fault plane, prohibiting energy release of the mainshock, so the maximum magnitude of attershocks would be high.b) The fault of the M--8. l Kunlun Mountain earthquake on Nov. 14, 2001 is essentially a sinistral strike-slip fault,and the Corioli force pulled the two fault walls apart. Magnitude of the induced stress is about 0.06 MPa. Alter a comparison analysis, we suggest that the attershock activity level will not be high in the late period of this earth-quake sequence, and the maximum magnitude of the whole aftershocks sequence is estimated to be about 6.0.     

有关昆仑山西8.1级地震及其余震活动趋势的讨论

在处理了部分有关资料的基础上,从发震断层旋性、历史地震类比、地震活动图像变化和地震序列特征等多方面对昆仑山口西8．1级地震的余震活动趋势进行了讨论。结果表明：本次8．1级地震的最大余震震级可能为6级左右。     

东南沿海活动地块的初步划分

东南沿海地区无论过去还是现在都是华南中强地震多发区，西文度菌 从地质、地球物理和地球化学相结合的角度，并根据地震学、海洋地质学及深部构造物理资料，对东南沿海活动地块作一个初步划分，并对其地震活动性作了初步分析，得出了地块内部比较统一的地震活动图像。     

江西及邻区地震烈度衰减关系研究

收集江西及邻区的地震烈度等震线资料,采用椭圆长、短轴联合衰减模型和近、远场补点与长轴可转向方法,建立了该地区的地震烈度衰减关系并进行了验证,结果表明,该衰减关系符合该地区历史和近代地震震害分布的地域性特点,可进一步应用于地震安全性评价、震害预测、损失快速评估等研究.     

双差地震定位法在邯郸-邢台地区地震精确定位中的初步应用

采用双差地震定位方法,利用2001-2006年间邯郸数字台网记录到的413次M1≥1.0地震的P波和S波震相到时资料,对邯郸一邢台地区(35.0°～38.0°N,113.0°～116.0°E)的地震进行了重新精确定位.经重新定位后得到其中295次地震的基本参数.重新定位结果显示了比较精细的震中分布图像和有所收敛的震源深度剖面图像,震源深度的优势分布为12～18 km,平均深度为14.9 km,部分震中位置与震源深度变化较大的地震向断裂带靠近.