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封面故事：鲜水河断裂带乾宁段断层陡坎野外照片。“活动构造与断裂作用”创新团队在龙门山断裂带和鲜水河断裂带的变形机制方面取得了重要进展, 首次发现大地震可在浅部含水断层泥中发生熔融作用, 确定了龙门山断裂带晚三叠世的地震机制, 提供了青藏高原东缘不存在下地壳流机制的新证据, 并提出深部流体促进弱断层局部强化从而诱发地震的新机制。这项由中国地质科学院地质研究所李海兵研究员主持的研究成果, 当选中国地质科学院2023年度十大科技进展, 排名第三。详见本期854-870页。(图片提供: 吴琼)
Cover Story：Field photograph of fault scarps in the Qianning segment of the Xianshuihe fault zone. The “Ac-tive Tectonics and Faulting” research team has achieved important results pertaining to the de-formation mechanism of the Longmen Shan and Xianshuihe fault zones. For the first time, this research discovered that large earthquakes formed a pseudotachylyte vein at an extremely shallow depth, which was generated in an un-consolidated, fluid-rich fault gouge. The focal mechanism of a Late Triassic large-magnitude earthquake was determined. This research provides new evidence that there is no mechanism of lower crustal chan-nel-flow extrusion in the eastern Tibetan Plateau and reports a new mechanism for deep fluids to promote local strengthening of weak faults and thus induce earthquakes. The research achieve-ment, led by Professor LI Haibing of the Insti-tute of Geology, CAGS, ranks third among the “Top Ten Sci-tech Progresses of CAGS in 2023”. For details, see pp. 854-870 of this issue. (Photo by WU Qiong)
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