Rockfall localization from seismic polarization considering multiple triaxial geophones and frequency bands

doi:10.1007/s11629-020-6132-1

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > Journal of Mountain Science > Journal of Mountain Science-2020 > Vol17 No.7

	Rockfall localization from seismic polarization considering multiple triaxial geophones and frequency bands
	Feng, Liang; Pazzi, Veronica; Intrieri, Emanuele; Gracchi, Teresa; Gigli, Giovanni; Tucci, Grazia
刊名	JOURNAL OF MOUNTAIN SCIENCE
	2020
卷号	17 期号:7 页码:1541-1552
关键词	Rockfall Localization Seismic polarization Seismic monitoring Early warning
ISSN号	1672-6316
DOI	10.1007/s11629-020-6132-1
文献子类	Article
英文摘要	Boulder/rock mass movements generate ground vibrations that can be recorded by geophone networks. Generally, there are two methods applied to rockfall trajectory reconstruction or rockfall seismic localization. One method uses seismic wave arrival times and is achieved by minimizing the differences in signal arrival times between multiple stations by grid map searching. The other method uses seismic polarization and is achieved by calculating event-source back azimuths from the seismic polarizations of rockfall signals. In this study, we proposed the use of an overdetermined matrix for joint localization based on the polarization method. The overdetermined matrix considers the contributions of all geophones in the network, and at each geophone is assigned a different weight according to the recorded signal qualities and the reliability of the calibrated back azimuths. This method shows a great advantage relative to the case in which only two sensors are employed. Besides, we suggested three marker parameters for proper frequency band selection in back azimuth calculations: energy, rectilinearity, and a special permanent frequency band (SPF). We found that the back azimuths calculated with energy and an SPF are generally close to the real back azimuths measured in the field, while the SPF is limited by seismic attenuation due to a long-distance propagation. The localization results of rockfalls were validated by using field camera videos and in situ calibrations. Three typical cases and 43 artificially released rockfalls are presented in this paper. The proposed method provides an interesting way to locate rockfall events and track rockfall trajectories and avoids the difficulties of obtaining accurate arrival times, as required by the arrival times method.
电子版国际标准刊号	1993-0321
语种	英语
WOS记录号	WOS:000541223600002
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/50437]
专题	Journal of Mountain Science_Journal of Mountain Science-2020_Vol17 No.7
推荐引用方式 GB/T 7714	Feng, Liang,Pazzi, Veronica,Intrieri, Emanuele,et al. Rockfall localization from seismic polarization considering multiple triaxial geophones and frequency bands[J]. JOURNAL OF MOUNTAIN SCIENCE,2020,17(7):1541-1552.
APA	Feng, Liang,Pazzi, Veronica,Intrieri, Emanuele,Gracchi, Teresa,Gigli, Giovanni,&Tucci, Grazia.(2020).Rockfall localization from seismic polarization considering multiple triaxial geophones and frequency bands.JOURNAL OF MOUNTAIN SCIENCE,17(7),1541-1552.
MLA	Feng, Liang,et al."Rockfall localization from seismic polarization considering multiple triaxial geophones and frequency bands".JOURNAL OF MOUNTAIN SCIENCE 17.7(2020):1541-1552.