摘要
介绍了利用矩能比估算地震波辐射能的方法,并在此基础上研究了云南地区1900～2004年M≥5.0强震的地震波辐射能量释放的时空分布,认为:①统计期间的能量释放在时间和空间分布上具有明显的非均匀性,前65 a的能量释放为22%,后40 a为78%,且约87%的能量释放集中在云南7个主要地震带,其余地区仅占13%左右;②云南地区强震活跃期和平静期累计释放能量的统计结果显示,5个平静期期间的累计释放能量折合震级均在6.8～7.2级之间.云南进入第5个平静期已接近10 a,期间累计释放能量折合成震级约为6.8级,与前4个平静期的时间间隔和能量释放相当,表明云南地区进入新一轮强震活跃期的危险性正在逐渐增大,云南东部地区可能是强震发生的危险区.
Some methods for calculating seismic wave radiation energy are introduced. Based on this, the time-space distribution of seismic wave radiation energy of M ≥ 5.0 earthquake in the Yunnan area in 1900 - 2004 is studied. The results show： ①The energy release is very nonuniform in time and space distribution in 105 years. In the early 65 years the released energy is 22%, but that is 78% in following 40 years. Furthermore, the accumulated released energy in 7 main seismic belts of Yunnan accounts for 87%, but just 13% in other areas of Yunnan. ② According to the statistic of accumulated released energy in active periods and quiet periods of strong earthquakes of Yunnan since 100 years, the released energy in every one of 5 quiet periods is equivalent to the magnitude of 6. 8 -7. 2. The fifth seismically quiet period of Yunnan has been near 10 years so far, and the released energy in this period is equivalent to magnitude about 6. 8, which has reached the levels in the former 4 quiet periods, it indicates that Yunnan is going to enter a new active period of strong earthquake and the risk site may be in the east of Yunnan.
出处
《地震研究》
CSCD
北大核心
2005年第4期307-312,共6页
Journal of Seismological Research
基金
云南省重点科技攻关项目"云南强震中短期预测研究"(NG2001)资助
关键词
强震活动
地震波辐射能
能量释放
时间变化
空间分布
云南地区
strong seismicity, seismic wave radiation energy, energy release, time variation, spatial distfibution, Yunnan
