Coseismic and postseismic motion of a landslide: Observations, modeling, and analogy with tectonic faults
Coseismic and postseismic motion of a landslide: Observations, modeling, and analogy with tectonic faults
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DOI：
10.1002/2014gl061170
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发表时间：
2014-10-16
影响因子：
5.2
通讯作者：
Guillier, B.
中科院分区：
文献类型：
--
作者：
Lacroix, P.;Perfettini, H.;Guillier, B.
我们记录的第一个时间序列的滑坡复活地震连续GPS测量的马卡滑坡（秘鲁）。我们的调查显示，约2厘米的滑坡同震响应，其次是5周的松弛期，在此期间，震后滑动是3倍大于同震位移本身。我们的研究结果证实了同震激活的滑坡，并提供了第一次观察震后位移。这些观察结果是一致的力学模型，滑坡基底界面上的滑动速率和状态摩擦，类似于蠕动构造断层的力学，打开新的视角来研究滑坡和活动断层的力学。
We document the first time series of a landslide reactivation by an earthquake using continuous GPS measurements over the Maca landslide (Peru). Our survey shows a coseismic response of the landslide of about 2 cm, followed by a relaxation period of 5 weeks during which postseismic slip is 3 times greater than the coseismic displacement itself. Our results confirm the coseismic activation of landslides and provide the first observation of a postseismic displacement. These observations are consistent with a mechanical model where slip on the landslide basal interface is governed by rate and state friction, analogous to the mechanics of creeping tectonic faults, opening new perspectives to study the mechanics of landslides and active faults.