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Preliminary results on a near-real-time rock slope damage monitoring system based on relative velocity changes following the September 5,2022 M_(S) 6.8 Luding,China earthquake

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Earthquake Research Advances 2023年第1期3卷 31-36页

作者： Fan Xie Chen Liang Shigui Dai Bo Shao Huibao Huang Jinhui Ouyang Li Li eric larose Institute of Science and Technology China Three Gorges CorporationBeijing 100089China Key Laboratory of Earthquake Source Physics China Earthquake AdministrationBeijing 100081China Dadu River Hydropower Development Co. Ltd.Chengdu 610016China Sichuan Earthquake Agency Chengdu 610044China ISTerre CNRSand University Grenoble AlpesGrenobleFrance

Relative seismic velocity change(dv/v)is important for monitoring changes in subsurface material properties and evaluating earthquake-induced rock slope damage in a geological disaster-prone *** this paper,we present a rapid damage assessment on three slow-moving rock slopes by measuring dv/v decrease caused by the 2022 M_(S) 6.8 Luding earthquake in Southwest *** applying the stretching method to the cross-correlated seismic wavefields between sensors installed on each slope,we obtain earthquake-induced dv/v decreases of~2.1%,~0.5%,and~0.2%on three slopes at distances ranging from~86 to~370 km to the epicenter,***,based on seismic data recorded by 16 sensors deployed on the rock slope at a distance of~370 km away from the epicenter,a localized dv/v decease region was observed at the crest of the slope by calculating the spatial dv/v images before and after the *** also derive an empirical in situ stress sensitivity of -7.29×10^(-8)/Pa by relating the dv/v change to the measured peak dynamic *** results indicate that a rapid dv/v assessment not only can help facilitate on-site emergency response to earthquakeinduced secondary geological disasters but also can provide a better understanding of the subsurface geological risks under diverse seismic loadings.

关键词： Relative velocity change Rock slope damage Luding earthquake Space-time evolution

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Lunar noise correlation,imaging and monitoring

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Earthquake Science 2010年第5期23卷 519-530页

作者： Christoph Sens-Schnfelder eric larose Institute for Geophysics and Geology Universitt Leipzig Laboratoire de Géophysique Interne et Tectonophysique CNRS and Université Joseph Fourier

Passive seismic techniques have revolutionarised seismology, leading for example to increased resolution in surface wave tomography, to the possibility to monitor changes in the propagation medium, and to many new processing strategies in seismic exploration. Here we review applications of the new techniques to a very particular dataset, namely data from the Apollo 17 lunar network. The special conditions of the lunar noise environment are investigated, illustrating the interplay between the properties of the noise and the ability to reconstruct Green＇s functions. With a dispersion analysis of reconstructed Rayleigh waves new information about the shallow shear velocity structure of the Moon are obtained. Passive image interferometry is used to study the effect of temperature changes in the subsurface on the seismic velocities providing direct observation of a dynamic process in the lunar environment. These applications highlight the potential of passive techniques for terrestrial and planetary seismology.

关键词： Moon monitoring passive image interferometry noise planetary seismology

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