Landscape evolution in active orogen region is inevitably affected by landslides associated with strong earthquakes, rain or storm. However, quantitative studies of the orogenic or eroded volumes are rarely demonstrat...Landscape evolution in active orogen region is inevitably affected by landslides associated with strong earthquakes, rain or storm. However, quantitative studies of the orogenic or eroded volumes are rarely demonstrated. The 2008 Wenchuan Earthquake triggered serious landsliding, consequently, a large amount of landslide material. However, the landslide volume is estimated mainly on the landslides areas interpreted in their semi-automated landslide mapping algorithm. However, the total volume of landslides triggered by the Wenchuan Earthquake amounts to 5-10 times bigger than the expected upper bound according to the empirical correlation between ＂total landslide volume＂ and ＂moment magnitude＂. Here we show that the total landslide volume estimation has large uncertainties to be used to determine whether the Wenchuan Earthquake generates or reduces relief. Thus, the widely held view that large dip-slip and oblique-slip earthquakes build mountainous topography may still be applicable to the Wenchuan Earthquake in Longmen Shan area. To challenge this view, simple landslide volume and co-seismic uplift comparison is not enough, i.e., more data are needed.展开更多
The detailed 14 C dating, palynological, carbon isotope and magnetic susceptibility analyses of a paleo swamp record obtained near Beijing show that the succession of climate events in Beijing area is broadly consiste...The detailed 14 C dating, palynological, carbon isotope and magnetic susceptibility analyses of a paleo swamp record obtained near Beijing show that the succession of climate events in Beijing area is broadly consistent with the climatic behavior in the North Atlantic region during the period from 13 000 to 10 000 a B.P., but with evident local characteristics. A relatively warm and wet episode （11 400\10 950 a B.P.） was intercalated between two dry cold episodes （11 600\11 400 and 10 950\ 10 450 a B.P.）.展开更多
基金funded by the National Natural Science Foundation of China (No. 41102136)the National Nonprofit Fundamental Research Grant of China (No. IGCEA1119)the Foundation of Returned Overseas Scholars of China (to Dr. Zhikun Ren)
文摘Landscape evolution in active orogen region is inevitably affected by landslides associated with strong earthquakes, rain or storm. However, quantitative studies of the orogenic or eroded volumes are rarely demonstrated. The 2008 Wenchuan Earthquake triggered serious landsliding, consequently, a large amount of landslide material. However, the landslide volume is estimated mainly on the landslides areas interpreted in their semi-automated landslide mapping algorithm. However, the total volume of landslides triggered by the Wenchuan Earthquake amounts to 5-10 times bigger than the expected upper bound according to the empirical correlation between ＂total landslide volume＂ and ＂moment magnitude＂. Here we show that the total landslide volume estimation has large uncertainties to be used to determine whether the Wenchuan Earthquake generates or reduces relief. Thus, the widely held view that large dip-slip and oblique-slip earthquakes build mountainous topography may still be applicable to the Wenchuan Earthquake in Longmen Shan area. To challenge this view, simple landslide volume and co-seismic uplift comparison is not enough, i.e., more data are needed.
文摘The detailed 14 C dating, palynological, carbon isotope and magnetic susceptibility analyses of a paleo swamp record obtained near Beijing show that the succession of climate events in Beijing area is broadly consistent with the climatic behavior in the North Atlantic region during the period from 13 000 to 10 000 a B.P., but with evident local characteristics. A relatively warm and wet episode （11 400\10 950 a B.P.） was intercalated between two dry cold episodes （11 600\11 400 and 10 950\ 10 450 a B.P.）.
