【摘要】 <正> 方法 地震波在地球介质内传播时,由于介质的非弹性效应及其非均匀性所造成的散射现象必然会产生能量的损耗。为了描述能量损耗的大小,引入了无量纲的物理量——介质的品质因子Q。2π/Q代表了每周波中能量的损耗与周波内总能量之比。因而Q值反映了更多还原

【Abstract】 The Q-values (quality factors) of the media in those areas corresponding to seven earthquake swarms, including the swarm in Wujiahe, and a foreshock sequence in Hai-cheng, as well as to four aftershock sequences in Heringer and other regions, are calculated in this paper. A comparison between the results calculated from the said various types of earthquakes is made in an attempt to provide some reference information for identifying seismic risk. The following can be seen from the calculations:1. All the low Q-value areas (Q<100) are the places where the earthquake swarms occurred;2. The haieheng foreshocks took place in the high Q-value area (Q>400);3. The mainshock-aftershoek or foreshock-mainshoek-aftershock type earthquakes happened in the fairly high Q-value areas (Q≈200-400);4. The swarms occurring in the high Q-value areas may be a kind of reflection of the increase of the strong earthquake risk in this area;5. The heterogeneity of local structure may cause large gradient variations of the Q-values, therefore, the media characteristics and seismicity in the vicinity of a low Q-value area can not be neglected.更多还原