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首页> 外文期刊>Natural hazards and earth system sciences >Seismic and mechanical studies of the artificially triggered rockfall at Mount Neron (French Alps, December 2011)
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Seismic and mechanical studies of the artificially triggered rockfall at Mount Neron (French Alps, December 2011)

机译：对Neron山人工触发岩崩的地震和力学研究（法国阿尔卑斯山，2011年12月）

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摘要

The eastern limestone cliff of Mount Neron (French Alps) was the theater for two medium-size rockfalls between summer and winter 2011. On 14 August 2011, a similar to 2000 m(3) rock compartment detached from the cliff, fell 100 m below and propagated down the slope. Although most of the fallen rocks deposited on the upper part of the slope, some blocks of about 15 m in size were stopped by a ditch and an earthen barrier after a run-out of 800 m. An unstable overhanging similar to 2600 m(3) compartment remained attached to the cliff and was blasted on 13 December 2011. During this artificially triggered event, 7 blocks reached the same ditch, with volumes ranging from 0.8 to 12 m(3). A semi-permanent seismic array located about 2.5 km from the site recorded the two events, providing a unique opportunity to understand and to compare the seismic phases generated during natural and artificially triggered rockfalls. Both events have signal duration of similar to 100 s with comparable maximum amplitudes recorded at large distances (computed local magnitude of 1.14 and 1.05, respectively), most of the energy lying below 20 Hz. Remote sensing techniques (photogrammetry and lidar) were employed before and after the provoked rockfall, allowing the volume and fracturing to be characterized. This event was filmed by two video cameras, and the generated ground motions were recorded using two temporary 3C seismic sensors and three seismic arrays deployed at the slope toe.
机译：在2011年夏季和冬季之间，内龙山（法国阿尔卑斯山）的东部石灰岩悬崖曾是两次中型落石的剧场。2011年8月14日，从悬崖上脱落的一个类似于2000 m（3）的岩石车厢掉落到下方100 m并沿着斜坡传播。尽管大部分倒塌的岩石都沉积在斜坡的上部，但在800 m的跳动之后，一些约15 m的块体被沟渠和土障挡住了。类似于2600 m（3）隔室的不稳定悬垂物仍附着在悬崖上，并于2011年12月13日爆破。在此人为触发的事件中，有7个区块到达同一沟渠，体积从0.8到12 m（3）。距离现场约2.5公里的一个半永久性地震阵列记录了这两个事件，为了解和比较自然和人为触发的岩崩产生的地震相位提供了独特的机会。这两个事件的信号持续时间都近似于100 s，并且在远距离（分别计算出的本地幅度为1.14和1.05）处记录了可比较的最大幅度，大部分能量都在20 Hz以下。在引起岩崩之前和之后均采用了遥感技术（摄影测量法和激光雷达），从而可以对岩体的体积和压裂进行表征。该事件由两个摄像机拍摄，并使用两个临时的3C地震传感器和部署在坡脚趾处的三个地震阵列记录了产生的地面运动。

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