Characterizing the complexity of microseismic signals at slow-moving clay-rich debris slides : the Super-Sauze ( southeastern France ) and Pechgraben ( Upper Austria ) case studies
Characterizing the complexity of microseismic signals at slow-moving clay-rich debris slides : the Super-Sauze ( southeastern France ) and Pechgraben ( Upper Austria ) case studies
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描述缓慢移动的富含粘土碎片滑坡的微震信号的复杂性：Super-Sauze（法国东南部）和Pechgraben（上奥地利）案例研究
DOI：
10.5194/esurf-2017-65
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发表时间：
2018
影响因子：
3.4
通讯作者：
M. Joswig
中科院分区：
文献类型：
--
作者：
N. Vouillamoz;S. Rothmund;M. Joswig
土壤和岩屑滑坡很容易迅速而剧烈地复活。在不稳定性内的变形通过滑动来调节，从而通过材料变形释放弱地震能量。因此，被动微震监测提供了与边坡动力学有关的信息。在这项研究中，被动微震数据采集在超级Sauze（法国东南部）和Pechgraben（上奥地利）缓慢移动的粘土丰富的碎片幻灯片（“粘土滑坡”）进行了调查。观测基准对以前类似的案例研究，以提供一个全面的和均匀的类型学在粘土质滑坡的微震信号。深入了解边坡变形产生的各种微震信号是未来开发滑坡预警系统中自动检测系统的关键。探测到的信号范围从短持续时间（< 2秒）的地震样信号到各种各样的长持续时间的震颤样辐射（> 2秒-几分钟）。地震速度结构的复杂性、可用信号起始的低数量和低质量以及非最佳地震网络几何结构严重阻碍了震源定位过程;因此，呈现震源过程表征具有挑战性。因此，我们限制源的位置使用近源区域（<约50米）滑坡诱发的微震事件的突出波形振幅衰减模式的特点。粘土质滑坡（ML-LS）的本地震级表经验校准使用校准射击和锤击数据。导出的ML-LS返回每日滑坡引起的微震率，与较高的平均每日位移率呈正相关。然而，需要高的时间和空间分辨率的滑坡动力学和水文分析，以更好地破译潜在的关系滑坡诱发的微震信号滑坡变形。
Soil and debris slides are prone to rapid and dramatic reactivation. Deformation within the instability is accommodated by sliding, whereby weak seismic energies are released through material deformation. Thus, passive microseismic monitoring provides information that relates to the slope dynamics. In this study, passive microseismic data acquired at Super-Sauze (southeastern France) and Pechgraben (Upper Austria) slow-moving clay-rich debris slides (“clayey landslides”) are investigated. Observations are benchmarked against previous similar case studies to provide a comprehensive and homogenized typology of microseismic signals at clayey landslides. A thorough knowledge of the various microseismic signals generated by slope deformation is crucial for the future development of automatic detection systems to be implemented in landslide early-warning systems. Detected signals range from short-duration ( < 2 s) quake-like signals to a wide variety of longer-duration tremor-like radiations (> 2 s – several min). The complexity of seismic velocity structures, the low quantity and low quality of available signal onsets and non-optimal seismic network geometry severely impedes the source location procedure; thus, rendering source processes characterization challenging. Therefore, we constrain sources’ locations using the prominent waveform amplitude attenuation pattern characteristic of near-source area (< about 50 m) landslide-induced microseismic events. A local magnitude scale for clayey landslides (ML−LS) is empirically calibrated using calibration shots and hammer blow data. The derived ML−LS returns daily landslideinduced microseismicity rates that positively correlate with higher average daily displacement rates. However, high temporal and spatial resolution analyses of the landslide dynamics and hydrology are required to better decipher the potential relations linking landslide-induced microseismic signals to landslide deformation.
使用地震波形振幅自动定位冰震的方法
影响因子：
2.9
作者：
Jones G
通讯作者：
Jones G