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慢驱动机制是自组织临界系统(SOC)的基本条件之一,若仅当驱动机制发生改变时,系统的行为特性会呈现何种变化,尚未有人研究.针对这一问题开展了快驱动机制的沙堆模型实验,通过快速倾斜沙堆底板的方式使沙堆从欠临界角快速到达临界角.实验表明,沙堆坡度保持在临界角附近时,落沙量服从幂律分布;随着沙堆坡度逐渐偏离临界角度,落沙量的统计特性将经历对数正态分布-正态分布的转变,不再呈现SOC特性.汶川实震诱发断裂带上盘的崩塌滑坡原型问题是驱动机制改变在自然界中的体现(其隆升速度与滑坡速度之间不存在巨大的时间标度分离).在对汶川地震断裂带上、下盘地区1.5km内的崩塌滑坡规模面积统计分析发现,上盘灾害服从对数正态分布,而下盘不服从对数正态分布.据此,推断汶川地震靠近断裂带上盘附近的崩塌滑坡呈现对数正态分布的规律可能是具普适性意义的现象.
Slow driving mechanism is one of the basic conditions of self-organized critical system (SOC). If only the driving mechanism changes, the behavior of the system will show what kind of changes have not been studied. To solve this problem, a fast driving mechanism Sand pile model experiment, by rapidly tilting the bottom of the sand pile, the sand pile rapidly reaches the critical angle from the critical angle.Experiments show that when the slope height of the sand pile is close to the critical angle, the volume of sediment obeys the power law distribution, The slope gradually deviates from the critical angle, the statistical characteristics of the amount of sediment will experience a logarithmic normal distribution - the normal distribution of the change, no longer presents the SOC characteristics. Wenchuan earthquake induced fracture plate landslide prototype problem is the driving mechanism changes in the The natural manifestation (there is no huge time scale separation between the uplift velocity and the landslide velocity) .According to the statistical analysis of landslides area within 1.5km of the Wenchuan earthquake fault zone, it is found that the landslide disaster Obey the logarithm normal distribution, but the sub-plate does not obey the logarithm normal distribution.Accordingly, the law of the logarithm normal distribution of the landslide near the upper plate of the Wenchuan earthquake can be inferred The adaptive significance of the phenomenon.