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arXiv 1502.05485physics.geo-phphysics.class-ph
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一种可能的地震共振机制

A possible resonance mechanism of earthquakes

V. V. Flambaum, B. S. Pavlov

摘要:

Linkov,Petrova和Osipov(1992)观测到95%的强震前存在4-6小时的200微赫兹地震引力振荡(SGO)周期脉冲。我们解释这之间的振动本征模式的整个构造板块和一个活动区的本地本征模式跳动。跳动将振动能量从构造板块的远区转移到活动区,引发地震。板块的振荡频率和活动带的振荡频率被调谐到共振,这是由于相邻板块的碰撞或岩浆流在地幔(上地幔)的液体中的流动而施加到活动带的额外压缩。在存在具有不可消除的差频的三个或更多个SGO的情况下,SGO拍频模式看起来是准随机的,从而掩盖了拍频过程的非随机性质。然而,我们能够讨论基于跳动动力学的精确监测的短期地震预测的可能性。

英文摘要:

It had been observed by Linkov, Petrova and Osipov (1992) that there exist periodic 4-6 hours pulses of 200 microHz seismogravitational oscillations ( SGO ) before 95 % of powerful earthquakes. We explain this by beating between an oscillation eigenmode of a whole tectonic plate and a local eigenmode of an active zone. The beating transfers the oscillation energy from the remote zone of the tectonic plate to the active zone, triggering the earthquake. Oscillation frequencies of the plate and ones of the active zone are tuned to a resonance by an additional compression applied to the active zone due to collision of neighboring plates or the magma flow in the liquid underlay of the astenosphere ( the upper mantle). In the case when there are three or more SGO with incommensurable difference frequencies the SGO beating pattern looks quasi-random, thus masking the non-random nature of the beating process. Nevertheless, we are able to discuss a possibility of the short term earthquakes predictions based on an accurate monitoring of the beating dynamics.

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