摘要
根据我国几次地震前后重力变化的实测资料提出重力随时间变化的简化模型。考虑到重力扰动借助简正模分析对贝纳德问题的动力学进行求解。计算表明， 在强地震的孕育期， 重力表现为负异常时贝纳德花样的周期变化在一段时间内〔正文（３４） 式〕将自动停止； 重力表现为正异常时贝纳德花样在一段时间内〔正文（３５） 式〕将始终存在。这个结论可能作为一种新的地震预测方法的理论基础。
Based on the information of practical survey upon gravity change before and after several earthquakes in our country, the paper presents a reduced model for change of gravity with time. In consideration of gravity disturbance the kinetic equations of Be'nard problem are solved by means of normal mode analysis. The evaluation indicated that during development period of strong earthquake either periodic change of Be'nard patterns in certain time〔see formula(34)in the text〕will stop automatically if gravity appears as negative anomaly, or Be'nard patterns in certain time〔see formula(35)in the text〕will exist all the time if gravity appears as positive anomaly. This conclusion can serve as the theoretical foundation of a new method on earthquake prediction.
出处
《地震研究》
CSCD
北大核心
1999年第4期349-356,共8页
Journal of Seismological Research
关键词
贝纳德效应
瑞利数
重力异常
地震预报
Be′nard effect, Rayleigh numbers, gravity anomaly, earthquake prediction
