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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Controls of preferential orientation of earthquake- and rainfall-triggered landslides in Taiwan's orogenic mountain belt
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Controls of preferential orientation of earthquake- and rainfall-triggered landslides in Taiwan's orogenic mountain belt

机译：台湾奥林山带地震和降雨悬臂滑坡优先取向控制

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摘要

Landsliding usually occurs on specific hillslope aspect, which may reflect the control of specific geo-environmental factors, triggering factors, or their interaction. To explore this notion, this study used island-wide landslide inventories of the Chi-Chi earthquake in 1999 (M-W = 7.6) and Typhoon Morakot in 2009 in Taiwan to investigate the preferential orientation of landslides and the controls of landslide triggers and geological settings. The results showed two patterns. The orientations of earthquake-triggered landslides were toward the aspect facing away from the epicenter in areas with peak ground acceleration (PGA) >= 0.6 g and landslide ratio >= 1%, suggesting that the orientations were controlled by seismic wave propagation. Rainfall-triggered landslides tended to occur on dip slopes, instead of the windward slopes, suggesting that geological settings were a more effective control of the mass wasting processes on hillslope scale than the rainfall condition. This study highlights the importance of the endogenic processes, namely seismic wave and geological settings, on the predesigned orientation of landslides triggered by either earthquake or rainfall, which can in turn improve our knowledge of landscape evolution and landslide prediction. (c) 2019 John Wiley & Sons, Ltd.
机译：Landsliding通常发生在特定的山坡方面，这可能反映了特定地理环境因素，触发因素或其互动的控制。为了探索这一概念，这项研究于1999年（M-W = 7.6）和台湾2009年的智驰地震的岛上滑坡库存，探讨了山体滑坡的优先取向和滑坡触发器和地质环境的控制。结果显示了两种模式。地震触发的山体滑坡的取向朝向远离震中的区域，峰接地加速度（PGA）> = 0.6g，滑坡比> = 1％，表明取向是通过地震波传播控制的。降雨触发的滑坡往往发生在倾角上，而不是迎风斜坡，这表明地质环境更有效地控制了山坡秤上的质量浪费过程比降雨条件。本研究突出了内部根工艺，即地震波和地质环境的重要性，对由地震或降雨引发的滑坡的预测定向，这又可以提高我们对景观演化和滑坡预测的知识。 （c）2019 John Wiley＆Sons，Ltd。

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