美国科罗拉多州立大学Sean F. Gallen团队，探索了美国科罗拉多州桑格雷德克里斯托山脉冰川消融对断层滑动的影响。该项研究成果发表在2024年11月13日出版的《地质学》上。

基于对美国科罗拉多州南部桑格雷德克里斯托山脉的研究，团队人员认为，气候驱动的冰荷载变化影响了山脉前正断层的时空滑动模式。残留的冰川特征能够重建古冰川的范围，并显示末次盛冰期（LGM）下盘冰覆盖的变化量。

线荷载模型表明，LGM后的冰融化，使地震深度的断层夹持应力降低了约20-55kpa。挠曲均衡模型显示，由于冰卸载，下盘隆起数米，其空间模式和量级与从偏移的全新世和晚更新世冲积扇测量的LGM后断层落差一致。LGM后断层落差率至少比中更新世和早更新世高5倍。该团队人员推断，气候调节的冰荷载变化可以调整断层夹持应力，和范围被界定的正断层的滑动模式。

附：英文原文

Title: Exploring the impact of deglaciation on fault slip in the Sangre de Cristo Mountains, Colorado, USA

Author: Cecilia Hurtado, Sean F. Gallen

Issue&Volume: 2024-11-13

Abstract: Few natural examples exist where climate’s influence on tectonics is clear. Based on a study of the Sangre de Cristo Mountains in southern Colorado, we argue that climate-driven changes in ice loads affected spatial and temporal slip patterns on the range-front normal fault. Relict glacial features enable the reconstruction of paleoglacier extents and show variable amounts of footwall ice coverage during the Last Glacial Maximum (LGM). Line load models indicate post-LGM ice melting reduced fault clamping stress by ～20-55 kPa at seismic depths. Flexural isostatic modeling shows several meters of footwall uplift due to ice unloading with spatial patterns and magnitudes consistent with post-LGM fault throw measured from offset Holocene and late Pleistocene alluvial fans. Post-LGM fault throw rates are at least a factor of five higher than middle and early Pleistocene rates. We infer that climate-modulated ice-load changes can pace fault clamping stress and slip patterns on range-bounding normal faults.

DOI: 10.1130/G52661.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G52661.1/650062/Exploring-the-impact-of-deglaciation-on-fault-slipredirectedFrom=fulltext