云南强震能量释放的时空特征研究
|
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。
ome 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:① The 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.
ome 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:① The 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.
引文
[1]达斯S,鲍特赖特J,肖尔茨C H.地震震源力学[M].北京:地震出版社,1991.
[2]皇甫岗.对云南地区强震活动规律的认识[J].地震研究,2002,25(增刊B):1-6.
[3]HaskellN A.Total energy and energy spectral density of elastic wave ra-diation from propagating faults[J].BSSA,1964,64(6):1811-1841.
[4]B rune J N.Tecton ic stress and spectra of seism ic shear wave fromearthquake[J].JGR,1970,75:4997-5009.
[5]Gutenberg R,R ichter C F.Magn itude and energy of earthquakes[J].Ann.Geofis.,1956,9:1-15.
[6]陈培善,Duda S J.地震辐射能对环境应力场的依赖性[J].地震学报,1993,15(2):146-152.
[7]陈培善,Duda S J.由CDSN记录计算出的谱震级和地震辐射能[J].地震学报,1993,15(4):418-426.
[8]秦嘉政,钱晓东,叶建庆,等.用峰值速度估算姚安地震序列的地震能量[J].地震学报,2002,24(1):98-102.
[9]Vassilion M S,Kanamori H.The energy release in earthquakes[J].BSSA,1982,72(1):371-387.
[10]W inslow N W,RuffL J.A hybrid m ethod for calcu lating the rad i-ated wave energy of deep earthquakes[J].Phys Earth P lanet In-ter,1999,115:181-190.
[11]秦嘉政,刘祖荫,钱晓东,等.由峰值速度估算地震应力降[J].地震学报,1997,19(5):471-479.
[12]闵子群.云南地区潜在震源区研究[A].见:云贵地区地震危险性研究文集[C].昆明:云南科技出版社,1988.
[2]皇甫岗.对云南地区强震活动规律的认识[J].地震研究,2002,25(增刊B):1-6.
[3]HaskellN A.Total energy and energy spectral density of elastic wave ra-diation from propagating faults[J].BSSA,1964,64(6):1811-1841.
[4]B rune J N.Tecton ic stress and spectra of seism ic shear wave fromearthquake[J].JGR,1970,75:4997-5009.
[5]Gutenberg R,R ichter C F.Magn itude and energy of earthquakes[J].Ann.Geofis.,1956,9:1-15.
[6]陈培善,Duda S J.地震辐射能对环境应力场的依赖性[J].地震学报,1993,15(2):146-152.
[7]陈培善,Duda S J.由CDSN记录计算出的谱震级和地震辐射能[J].地震学报,1993,15(4):418-426.
[8]秦嘉政,钱晓东,叶建庆,等.用峰值速度估算姚安地震序列的地震能量[J].地震学报,2002,24(1):98-102.
[9]Vassilion M S,Kanamori H.The energy release in earthquakes[J].BSSA,1982,72(1):371-387.
[10]W inslow N W,RuffL J.A hybrid m ethod for calcu lating the rad i-ated wave energy of deep earthquakes[J].Phys Earth P lanet In-ter,1999,115:181-190.
[11]秦嘉政,刘祖荫,钱晓东,等.由峰值速度估算地震应力降[J].地震学报,1997,19(5):471-479.
[12]闵子群.云南地区潜在震源区研究[A].见:云贵地区地震危险性研究文集[C].昆明:云南科技出版社,1988.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心