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Locating the Small 1999 Frenchman Flat, Nevada Earthquake with InSAR Stacking

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Journal of Geodesy and Geoinformation Science 2022年第1期5卷 39-49页

作者： zhenhong li College of Geological Engineering and Geomatics Chang’an UniversityXi’an 710054China Key Laboratory of Western China’s Mineral Resources and Geological Engineering Ministry of EducationXi’an 710054China COMET School of EngineeringNewcastle UniversityNewcastle upon Tyne NE17RUUK

Due to high interferometric coherence in the Nevada region,Interferometric Synthetic Aperture Radar(InSAR)phase stacking is capable of mapping coseismic signals from the 27 January 1999,M w 4.8 Frenchman Flat *** is one of the smallest earthquakes yet studied using InSAR with line-of-sight displacements as small as~1.5 *** the event as dislocation in an elastic half space suggests that the fault centroid was located at(115.96°W,36.81°N)with a precision of 0.2~0.3 km(1σ)at a depth of 3.4±0.2 *** the dense local seismic network in southern Nevada,differences as large as 2~5 km were observed between our InSAR earthquake location and those estimated from seismic *** InSAR-derived magnitude appeared to be greater than that from seismic data,which is consistent with other studies,and believed to be due to the relatively long time interval of InSAR data.

关键词： InSAR phase stacking earthquake precise location

Adaptive output regulation of uncertain nonlinear systems with unknown control directions

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Science China(Information Sciences) 2019年第8期62卷 210-212页

作者： Jingyu CHEN zhenhong li Zhengtao DING School of Electrical and Electronic Engineering University of Manchester

Dear editor,The output regulation problem for nonlinear systems with unknown exosystems has been an important research topic over the last few decades [1].The early results commonly assume that the sign of the high-frequency gain is known. It is shown [2]that a nonlinear system can be transformed into a special observer form under geometric coordinate-

关键词： pro Adaptive output regulation of uncertain nonlinear systems with unknown control directions

Initiation and Development of the Late Cenozoic Uplift of Daluo Mountains,Northeastern Margin of the Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2022年第6期96卷 1917-1931页

作者： KOU linlin DONG Xiaopeng li zhenhong CUI Jiawei MA Zhaoying li Hailong Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Chinese Academy of Geological Sciences Beijing 100037China Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Natural Resources Institute of GeomechanicsChinese Academy of Geological SciencesBeijing 100081China

Daluo Mountains lie at front of the arcuate tectonic belt at the northeastern margin of the Tibetan Plateau,and are the landform boundary zone between the active Tibetan Plateau and the stable North China *** of the late Cenozoic uplift evolution of Daluo Mountains is important for understanding the expansion mechanism of the northeastern margin of the Tibetan Plateau and its influence on the western North China *** this study,the late Cenozoic uplift of Daluo Mountains is constructed from the development of the late Cenozoic alluvial fan around Daluo *** entire sedimentary sequence and framework of the fan was revealed by the newly obtained drilling core *** cosmogenic nuclide,optically stimulated luminescence,and detrital zircon U-Pb dating results provide new evidences for discussion about the initial timing of the late Cenozoic uplift of Daluo Mountains and the key stages of uplift during the *** late Cenozoic alluvial fan at front of Daluo Mountains overlies a set of fluvial-facies strata;therefore,development of the alluvial-fan marks the start of late Cenozoic uplift of Daluo *** timing of this event can be constrained to~4.64 *** extensive gravel layers(dated to ca.0.76–0.6 Ma and~0.05 Ma)developed during the Pleistocene,indicating two episodes of considerable *** study provides a new time scale for the uplift and expansion of the arcuate tectonic belt at the northeastern margin of the Tibetan Plateau.

关键词： alluvial fan cosmogenic nuclide dating optically stimulated luminescence dating detrital zircon U-Pb dating Daluo Mountains Tibetan Plateau

Measurement of subsidence in the Yangbajing geothermal fields,Tibet,from TerraSAR-X InSAR time series analysis

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International Journal of Digital Earth 2016年第7期9卷 697-709页

作者： Yongsheng li Jingfa Zhang zhenhong li Yi Luo Wenliang Jianga Yunfeng Tian Key Laboratory of Crustal Dynamics Institute of Crustal DynamicsChina Earthquake AdministrationBeijingPeople’s Republic of China School of Civil Engineering and Geosciences Newcastle UniversityNewcastle upon TyneUK

Yangbajain contains the largest geothermal energy power station in *** explorations in Yangbajain first started in 1976,and two plants were subsequently built in 1981 and 1986.A large amount of geothermal fluids have been extracted since then,leading to considerable surface subsidence around the geothermal *** this paper,InSAR time series analysis is applied to map the subsidence of the Yangbajain geothermal fields during the period from December 2011 to November 2012 using 16 senses of TerraSAR-X stripmap SAR *** the case of the TerraSAR-X data,most orbital fringes were removed using precise orbits during the interferometric ***,residual orbital ramps remain in some interferograms due to the uncertainties in the TerraSAR-X *** remove the residual orbital ramps,we estimated a best-fit‘twisted plane’for each epoch interferogram using quadratic polynomial models based on a network *** method removes most of the long-wavelength signals,including orbit ramps and atmospheric *** vertically stratified component(Topography Correlated Atmospheric Delay,TCAD)was also removed using a network *** the influence of seasonal frozen ground(SFG)is not taken into consideration,our results show that the subsidence rate around power plant I(the south plant)is approximately 20 mm/yr with a peak of 30 mm/*** subsidence rate around power plant II(the north plant)is approximately 10 mm/yr,when accounting for the influence of SFG on the power plant and its surrounding ground *** results show that ground motion is caused by seasonal frozen ground and is strongly related to the temperature change.

关键词： Yangbajain geothermal surface subsidence small baseline subset InSAR time series seasonal frozen ground

Earthquake source parameters of the 2009 M_W7.8 Fiordland (New Zealand) earthquake from L-band InSAR observations

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Earthquake Science 2011年第2期24卷 199-206页

作者： zhenhong li Wei Qu Kateline Young Qin Zhang School of Geographical and Earth Sciences University of Glasgow Glasgow G12 8QQ UK College of Geology Engineering and Geomatics Chang’an University Xi’an 710054 China

The 2009 M W 7.8 Fiordland （New Zealand） earthquake is the largest to have occurred in New Zealand since the 1931 M W 7.8 Hawke’s Bay earthquake, 1 000 km to the northwest. In this paper two tracks of ALOS PALSAR interferograms （one ascending and one descending） are used to determine fault geometry and slip distribution of this large earthquake. Modeling the event as dislocation in an elastic half-space suggests that the earthquake resulted from slip on a SSW-NNE orientated thrust fault that is associated with the subduction between the Pacific and Australian Plates, with oblique displacement of up to 6.3 m. This finding is consistent with the preliminary studies undertaken by the USGS using seismic data.

关键词： InSAR New Zealand earthquake source parameter uniform slip modeling distributed slip modeling

Flexible Uplink MU-MIMO Scheduling in UnlicensedSpectrum

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China Communications 2017年第12期14卷 59-71页

作者： Boqi Jia Ting Zhou Honglin Hu Yang Yang zhenhong li Sandrine Boumard Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai China Shanghai Research Center for Wireless Communication Shanghai China TCL Communication Technology Holdings Ltd. Shanghai R&D Center Shanghai China VTT Technical Research Centre of Finland Ltd Oulu Finland University of Chinese Academy of Sciences Beijing China

Utilizing the unlicensed spectrum as supplementary is being studied to meet the increasingly growing demand of user equipment for rate,traffic and bandwidth,and thus to mitigate the current spectrum scarcity *** this paper,we investigate the uplink multi-user multiple-input multiple-output(UL MU-MIMO) technique to achieve multiplexing gain in unlicensed *** first define a new parameter called channel busy radio(CBR) which is related to the probability of occupying the unlicensed channel,and find that the failure to occupy the unlicensed channel leads to the performance degradation in unlicensed ***,according to the user-specific CBR of the unlicensed channel,we propose a flexible scheduling scheme for UL MU-MIMO in unlicensed spectrum,and formulate an optimization problem for the optimal scheduled user ***,an adaptive scheduling algorithm is proposed to decide the optimal number of the scheduled users *** simulation results show that,based on statistical channel condition in unlicensed spectrum,adjusting the number of the scheduled user flexibly can offset the degraded throughput and form an optimal MU-MIMO transmission.

关键词： 5G unlicensed spectrum MU-MIMO uplink scheduling

Palynological Evidence of Late Pleistocene Soft-sediment Deformation Event in the Northeastern Margin of the Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2023年第3期97卷 841-854页

作者： WEI lijie li zhenhong DONG Xiaopeng CUI Jiawei HUANG Ting KOU linlin Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Key Laboratory of Active Tectonics and Geological Safety Ministry of Natural ResourcesBeijing 100081China Key Laboratory of Paleomagnetism and Tectonic Reconstruction Ministry of Natural ResourcesBeijing 100081China

The northeastern margin of the Tibetan Plateau is the youngest part of the Tibetan Plateau where tectonic activity is intense and climate change is *** this study,combined with field investigations,we explored accelerator mass spectrometry 14C and optically stimulated luminescence dating and palynological analysis of the sedimentary sequence in the Qingshuihe Basin to explain the origin of soft-sediment deformation *** and palynological results from the Sanchahe section in the basin revealed a detailed history of vegetation variation and associated climate change from~18 to~5 ka *** results indicate that the permafrost developed at~18–11.7 ka BP,and the soft-sediment deformation structures formed at~11.7–5 ka *** with the characteristics of the deformation(meter-scale,continuous symmetrical wave)and paleoclimate,we suggest that the soft-sediment deformation layer in the late Pleistocene was cryoturbated under climatic *** discovery of a series of cryoturbations in the Qingshuihe Basin has further enriched the regional distribution of periglacial phenomena in the west of the Ordos Plateau,expanded the distribution range of periglacial phenomena,and provided evidence for exploring the temporal and spatial changes in permafrost in northern China at the end of the late Pleistocene.

关键词： cryoturbation palynological analysis late Pleistocene Qingshuihe Basin Tibetan Plateau

GPS AUTOMATIC MONITORING SYSTEM FOR OUTSIDE DEFORMATION OF GEHEYAN DAM ON THE QINGJIANG RIVER

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Geo-Spatial Information Science 2000年第2期3卷 58-64页

作者： XU Shaoquan liU Jingnan li Zhenghang li zhenhong School of Geo-science and Surveying Engineering Wuhan Technical University of Surveying and Mapping

In this paper,the background of developing GPS Automatic Monitoring System for outside deformation of Geheyan Dam is described *** framework,precision and features of the system are stated in ***,the prospective appli... 详细信息

关键词： GPS dam deformation deformation monitoring automatic system

Weight Based Channel Selection Towards 5G in the Unlicensed Spectrum

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China Communications 2018年第8期15卷 54-66页

作者： Yu Zeng Ting Zhou Honglin Hu Yang Yang Jinfeng Tian zhenhong li Shanghai Institute of Microsystem and Information Technology(SIMIT) Chinese Academy of SciencesNo.865 Changning RoadChangning DistrictShanghai 200050China University of Chinese Academy of Sciences No.19A Yuquan RoadShijingshan DistrictBeijing 100049China Shanghai Advanced Research Institute(SARI) Chinese Academy of SciencesNo.99 Haike RoadPudong DistrictShanghai 201210China ShanghaiTech University Shanghai 201210China TCL Communication Technology Holdings Ltd.Shanghai R&D Center Building C5-9FNo.232Liangjing RoadZhangjiang H igh-tech ParkShanghai 201203China

The growth of the wireless and mobile communication data traffic has brought severe challenges to the present telecommu- nication systems. To meet the ever-increasing mobile traffic demand in the next 5th generation （SG） communication systems, deploying 5G in the unlicensed spectrum （SG-U）, has been regarded as a promising technology. The Third Generation Partnership Project （3GPP） has specified the standardization of the li- censed Assisted Access （LAA） and its extension enhanced LAA （eLAA）, to opportunistically transmit in the unlicensed spectrum. The LAA/eLAA systems share unlicensed spectrum resource with other networks, e.g., the Wi-Fi systems. In this article, we analyze the coexistence between the eLAA and the Wi-Fi systems in the unlicensed spectrum. We firstly establish the system model where the eLAA coexists with the Wi-Fi systems. Then, we theoretically derive and figure out the unfairness in the multi-channel occupancy rate between the eLAA and the Wi-Fi systems. After that, we propose a weight based channel selection method to improve the fairness of the coexistence. The numerical results demonstrate that by avoiding contentions and declining collisions, our method not only enhances the fairness, but also improves the overall unlicensed spectrum usage rate.

关键词： 5G unlicensed spectrum eLAA Wi-Fi multi-channel transmission