Research press release


Nature Geoscience

Net loss of landscape during 2008 Wenchuan earthquake


A Densmoreらは、人工衛星画像を用いて地震後に起きた地滑りにより変位した物質の量を評価し、断層運動により生じた隆起よりも2〜7倍大きいことを発見した。彼らは、地滑りによる岩屑のごく一部は浸食されるとしても、地滑りにより総体としてその地域から物質が失われたことになると結論している。

Landslides triggered by the 2008 Wenchuan earthquake in China removed more material than was added by the mountain uplift generated by the fault movement reports a paper published online in Nature Geoscience. Shallow earthquakes are considered the primary driver of growth in mountain ranges, but in this case the landslides triggered by the quake seem to have removed more material than was added.

Alex Densmore and colleagues used satellite imagery to assess the amount of material displaced by landslides following the earthquake, and found that it was two to seven times greater than the uplift caused by the fault motion. They conclude that, even if only a fraction of the debris from the landslides is eroded, it will still result in a net loss of material from the region.

doi: 10.1038/ngeo1154


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