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本文从地球化学地热标度,钻孔地热、温泉、水温资料以及钻井岩样镜下分析,研究了地震区的热动状态。结果表明该区岩浆活动的方式是间歇性的、冲击性的。岩浆的主要活动可以分为震前、临震、震后三个活动期。震前活动期(震前2—3年)伴随有龙陵地震孕震体的隆起,重力异常,地震活动性的增强和孕震体的扩展——收缩演化。临震活动期(震前1—2月)伴随有小震群。震后活动期(震后约月余)伴随有震源深度的由深至浅的周期性推移。 研究结果还表明M≥4级地震主要集中于15—25KM,与低速层层位大体相符;整个余震序列震源深度有明显的层位分布特征,不同层位b值不同,深度愈深b值愈小;地震、重力、地热资料彼此有很好的一致性,而且这样的一致性条件显然是由地球内部(岩浆活动)热动状态决定的。
In this paper, geothermal geothermal scale, geothermal drilling, hot springs, water temperature data and drilling rock samples microscopic analysis of the thermal state of the earthquake zone. The results show that the magmatic activity in this area is intermittent and impacting. The main activities of magma can be divided into three active periods before earthquake, impending earthquake and post-earthquake. The pre-earthquake period (2-3 years before the earthquake) is accompanied by the uplift of the seismogenic body, the anomalous gravity, the enhancement of seismicity and the expansion-shrinkage evolution of the seismogenic body. Pro-seismic activity period (1-2 months before the earthquake) accompanied by small swarm of swarms. The post-earthquake active period (more than a month after the earthquake) is accompanied by a cyclical shift from deep to shallow. The results also show that the M ≥ 4 earthquakes are mainly concentrated in the range of 15-25KM, which is generally consistent with the low-velocity horizon; the focal depths of the whole aftershock sequence have obvious distribution of the horizon; the b values of different horizon are different; Earthquakes, gravity, and geothermal data are in good agreement with each other, and such consistency is apparently determined by the thermodynamic state of the Earth’s interior (magmatic activity).