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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Large scale landslides triggered by Quaternary tectonics in the Acambay graben, Mexico
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Large scale landslides triggered by Quaternary tectonics in the Acambay graben, Mexico

机译：墨西哥阿坎贝格地区第四纪构造引发的大规模滑坡

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摘要

Detailed analysis was conducted on large-scale gravitational-tectonic deformations and landslides in the Acambay graben, an intra-arc basin in the trans-Mexican volcanic belt (TMVB). Field mapping and remote sensing revealed the slope instability of the northern graben boundary induced by the Acambay-Tixmadejé fault. Two major landslides of 0·1 km~3 and 0·05 km~3 in volume were identified and their characteristics were analyzed according to the role of tectonics, mechanism of slope failure, and possible triggering factors. Quaternary faulting played a major role in increasing the local relief, and the activity of the Acambay-Tixmadejé fault represents the main geomorphic factor conditioning the gravitational movements. Moreover, displacements along this fault generated sliding surfaces and reduced the strength of the rock mass. The two landslides are classified as large-scale rotational slides involving volcanic rocks of late Miocene-Pleistocene age. Since the Acambay graben is a seismogenic area with a known maximum horizontal ground acceleration of 0·5 g, a strong earthquake could be ascribed as the possible triggering mechanism of the landslides. Our work represents the first analysis of large gravitational slope movements in tectonically active regions in Mexico, a process that can be common in the intra-arc basins of the TMVB, where active tectonic, seismicity, weak altered volcanic rocks, and heavy rains affect the slope stability.
机译：详细分析了墨西哥湾跨火山带（TMVB）弧内盆地阿坎贝格grab陷中的大规模重力-构造变形和滑坡。野外测绘和遥感揭示了由Acambay-Tixmadejé断层引起的北部grab陷边界的边坡失稳。根据构造作用，边坡破坏机理及可能的触发因素，确定了两个主要的滑坡体，分别为0·1 km〜3和0·05 km〜3，并对其特征进行了分析。第四纪断层在增加局部起伏作用中起着重要作用，而阿坎贝－提克马德耶断层的活动代表了制约重力运动的主要地貌因素。此外，沿该断层的位移产生了滑动面并降低了岩体的强度。这两个滑坡被归类为涉及中新世至更新世晚期火山岩的大规模旋转滑坡。由于Acambay en岩是一个地震发生区域，已知最大水平地面加速度为0·5 g，因此可以将强烈地震归因于滑坡的触发机制。我们的工作代表了对墨西哥构造活动区内大重力坡度运动的首次分析，这一过程在TMVB弧内盆地中很常见，那里活动的构造，地震活动性，弱的火山岩蚀变和大雨影响了该地区。边坡稳定性。

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