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Active tectonic blocks and strong earthquakes in the continent of China

机译:中国大陆的活跃构造块和强地震

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摘要

The primary pattern of the late Cenozoic to the present tectonic deformation of China is characterized by relative movements and interactions of tectonic blocks. Active tectonic blocks are geological units that have been separated from each other by active tectonic zones. Boundaries between blocks are the highest gradient of differential movement. Most of tectonic activity occurs on boundaries of the blocks. Earthquakes are results of abrupt releases of accumulated strain energy that reaches the threshold of strength of the earth's crust. Boundaries of tectonic blocks are the locations of most discontinuous deformation and highest gradient of stress accumulation, thus are the most likely places for strain energy accumulation and releases, and in turn, devastating earthquakes. Almost all earthquakes of magnitude greater than 8 and 80% — 90% of earthquakes of magnitude over 7 occur along boundaries of active tectonic blocks. This fact indicates that differential movements and interactions of active tectonic blocks are the primary mechanism for the occurrences of devastating earthquakes.
机译:中国新生代晚期至目前的构造变形的主要模式是构造块体的相对运动和相互作用。活动构造块是通过活动构造带相互分隔的地质单元。块之间的边界是微分运动的最高梯度。大部分构造活动发生在块体的边界上。地震是突然释放的累积应变能达到地壳强度阈值的结果。构造块体的边界是最不连续的变形和应力积累的最高梯度的位置,因此是应变能积累和释放,进而破坏性地震的最可能发生的地方。几乎所有大于8%和80%以上的地震-超过7级的90%地震都发生在活动构造块体的边界。这一事实表明,活动构造块体的差异运动和相互作用是造成毁灭性地震的主要机制。

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