摘要
通过余震活动资料,说明了地震活动中的自组织行为和分形现象.对于地震断裂系统,利用地震频度作为序参量,并应用绝热消去法建立了代表地震活动演化规律的序参量所满足的主方程.通过主方程的解,很好地解释了一次大地震过程中可能出现的各种地震活动现象和有序性变化.像许多物理系统一样,包括大地震震源在内的地震断裂系统,在临界点处涨落会自行扩大并对系统状态的突变起着举足轻重的作用.同时,要注意系统内部不可预测的行为,正确对待地震的预测和预报的含义.
Self-organization behaviours and fractal phenomena in seismicity are described with affer-shock sequence data in the paper. Making use of seismic frequency as order parameter, the master equation of order parameter which represents regular evolution of seismicity is established by means of adiabatic elimination principle. With resulting solutions of the master equation, we can explain different seismicity phenomena including pre-seismic, impending and post-seismic activity, and change in order under whole process of major earthquake. A significant result is that internal fluctuation of earthquake fault system at critical point is able to enlarge by oneself. It is self-enlargement of the fluctuation which leads to the phase trasition of system is unpredictable.because of randomeness of the quake. The seismicity'behaviour at critical point is unpredictable because of randomeness of the fluctuation.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第1期25-36,共12页
Chinese Journal of Geophysics
关键词
地震
活动
自组织
演化
Seismicity, Self-organization, Order parameter, Master equation, Critical point, Unpredictability.
