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Pattern of stress change and its effect on seismicity rate caused by M_s8.0 Wenchuan earthquake

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Science China Earth Sciences 2010年第9期53卷 1260-1270页

作者： XIE ChaoDi zhu yuanqing LEI XingLin YU HaiYing HU XiongLin School of Ocean&Earth Science Tongji UniversityShanghai 200092China Geological Survey of Japan AISTTsukuba 305-8567Japan Seismological Bureau of Shanghai Shanghai 200062China Seismological Bureau of Yunnan Kunming 650224China

We use five published source models to calculate the Coulomb failure stress changes induced by the Ms8.0 Wenchuan earthquake, and analyze the association between stress changes and the subsequent earthquakes. Based on the analysis of uncertainties resulting from source models, we determine the stress changes on nearby faults caused by the Wenchuan earthquake. Moreover, we focus on the seismicity rate change as a function of time on every fault under the influence of stress changes. The results indicate that the spatial distributions of aftershocks correlate well with the regions where stress is calculated to increase using the related models. The largest lobes of dropped stress lie in the west and east sides of source fault. The largest lobes of increased failure stress close to southern and northern ends of the source fault extend into the whole source failure plane. In addition, another region of increased stress lies in the Wenchuan-Yingxiu zone close to the southern segment of source fault, where a large number of aftershocks have occurred. And subsequent earthquakes seem to extend to even more remote distances; therefore, this area also has a high risk of seismic hazard. We find that the positive stress changes on nearby faults imposed by the Wenchuan earthquake produce an encouraging effect on seismicity rate. The effect is most significant on the Pengxian-Guanxian fault and Qingchuan fault, the value of seismicity rate maintains two times greater than the value before the mainshock for the next hundred years on these faults, and the time needed for the aftershock rate to recover to the pre-mainshock seismicity rate can reach up to 800-900 yr. The influence is not significant on the western Qinling fault, the Longquanshan fault, the Xianshuihe fault, the Yulongxi fault, the Anninghe fault, the Minjiang fault, and the Aba fault. Compared with the seismicity rate on these faults before the mainshock, the aftershock rate is raised by less than two times, and the

关键词： Wenchuan earthquake optimally oriented fault Coulomb stress change seismicity rate

In situ identification of environmental microorganisms with Raman spectroscopy

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Environmental Science and Ecotechnology 2022年第3期11卷 102-113页

作者： Dongyu Cui Lingchao Kong Yi Wang yuanqing zhu Chuanlun Zhang Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen518055China State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science&EngineeringSouthern University of Science and TechnologyShenzhen518055China Shenzhen Key Laboratory of Marine Archaea Geo-Omics University of Southern University of Science and TechnologyShenzhen518055China Shanghai Sheshan National Geophysical Observatory Shanghai Earthquake AgencyShanghai200062China

Microorganisms in natural environments are crucial in maintaining the material and energy cycle and the ecological balance of the ***,it is challenging to delineate environmental microbes'actual metabolic pathways and intraspecific heterogeneity because most microorganisms cannot be *** spectroscopy is a culture-independent technique that can collect molecular vibration profiles from *** can reveal the physiological and biochemical information at the single-cell level rapidly and non-destructively in *** first part of this review introduces the principles,advantages,progress,and analytical methods of Raman spectroscopy applied in environmental *** second part summarizes the applications of Raman spectroscopy combined with stable isotope probing(SIP),fluorescence in situ hybridization(FISH),Raman-activated cell sorting and genomic sequencing,and machine learning in microbiological ***,this review discusses expectations of Raman spectroscopy and future advances to be made in identifying microorganisms,especially for uncultured microorganisms.

关键词： Raman spectroscopy Environmental microorganisms Single cells Metabolic activities

Branched tetraether lipids in Chinese soils:Evaluating the fidelity of MBT/CBT proxies as paleoenvironmental proxies

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Science China Earth Sciences 2016年第7期59卷 1353-1367页

作者： ZHENG FengFeng ZHANG ChuanLun CHEN YuFei LI FuYan MA CenLing PU Yang zhu yuanqing WANG YongLi LIU WeiGuo State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China School of Geography and Remote Sensing Nanjing University of lnformation Science&TechnologyNanjing 210044China Earthquake Administration of Shanghai Municipality Shanghai 200062China Key Laboratory of Gas Geochemistry Institute of Geology and GeophysicsChinese Academy of SciencesLanzhou 730000China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710075China

The ubiquitous occurrence of branched glycerol dialkyl glycerol tetraethers(br GDGTs) in soils has allowed development of new proxies for reconstruction of past climate and environment. The methylation and cyclization degrees of br GDGTs, expressed as MBT and CBT, respectively, are reported to be mainly controlled by mean annual air temperature(MAAT) and soil p H. However, the br GDGT-derived temperatures and soil p H scatter widely when data from different environmental conditions are considered. In this study, we collected over 300 soil samples from China, which are representative of humid(Xishuangbanna, Guangzhou, and Shanghai), semi-arid(Dongying) and semi-arid/arid(Lanzhou, Tibetan Plateau) regions. Collectively we have the most extensive dataset that broadly characterizes the distribution of br GDGTs according to climate zones in China. The overall data demonstrate that the MBT/CBT derived temperatures better match the measured MAATs in humid and non-alkaline regions than those from regions of low MAP(7.0–7.5). Similarly, CBT describes soil p H much better in humid and non-alkaline soils than in semi-arid/arid and alkaline soils; the semi-arid/arid and alkaline soils tend to show a positive correlation between soil p H and CBT, which contradicts that in the humid and non-alkaline soils. While soil p H, MAAT and mean annual precipitation(MAP) are dominating factors controlling the br GDGT distribution across all climate zones, conductivity, total organic carbon and total nitrogen, as well as soil water content can also play an important role locally. Removing br GDGT-II resulted in a revised CBT index that provides more accurate estimation of p H, especially in semi-arid/arid and alkaline soils. The overall Chinese dataset demonstrates that continental air temperature derived from br GDGT-proxies can vastly deviate from real measurements and should be used with extreme caution in paleo-climate or-environment studies.

关键词： brGDGTs MAAT Soil pH MAP Chinese soils Tibetan Plateau Chinese Loess Plateau

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沂沭断裂带及其邻区地壳P波层析成像研究

地学前缘 2023年第2期30卷 272-281页

作者：崔鑫宋秀青石耀霖殷海涛朱元清董腾超山东省地震局山东济南250014 中国地震局地球物理研究所北京100081 上海市地震局上海200062 上海佘山地球物理国家野外科学观测研究站上海201602 中国科学院大学北京100049

沂沭断裂带是华北克拉通东部的重要断裂带,历史上发生过8(1/2)级强震,区域速度模型研究可以提升地震震动图精度以及地震烈度速报的准确性,有助于防御未来的巨震,降低震害损失。本文搜集了沂沭断裂带及其邻近区域2008—2020年的数字地震... 详细信息

沂沭断裂带是华北克拉通东部的重要断裂带,历史上发生过8(1/2)级强震,区域速度模型研究可以提升地震震动图精度以及地震烈度速报的准确性,有助于防御未来的巨震,降低震害损失。本文搜集了沂沭断裂带及其邻近区域2008—2020年的数字地震波数据,经过数据降丛集化、走时数据正态分布筛选等处理得到了地震事件震中参数和走时震相数据。基于FMTOMO方法,反演得到了沂沭断裂带地壳三维速度结构。反演结果显示,在近地表地层,速度分布特征与地表地质构造单元存在密切联系,褶皱带和基岩出露区域常常呈现高速速度分布,含较厚土层的凹陷或海域区域则一般呈现低速速度分布;在中地壳地层,速度分布特征与地震活动性有密切的联系,地震震中往往密集分布于高速和低速的过渡区域。在莫霍面深度,沂沭带的速度分布呈现了分段性差异特征,且两侧的速度分布存在差异。这可能意味着断裂带深达地幔的现象。且在沂沭带中南段区域,存在高速速度分布特征,这可能与区域地幔物质上涌有关,也可能构成强震的孕震背景。郯城区域从地表至地幔顶部均显示高速速度异常,该区域会积累高应力,可能发生8级以上地震,推测其复发周期应该很长。

关键词：山东沂沭带 P波层析成像

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Research on the Result of Calibration for the Location of the Seismic Array in Shanghai

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Earthquake Research in China 2007年第1期21卷 55-61页

作者： Yu Haiying zhu yuanqing Zhao Shuli Earthquake Administration of Shanghai Municipality Shanghai 200062 China

The paper proposes the calibration theory and methods for the Shanghai seismic array and analyzes the calibration results. As a result, the calibration results for the seismic array based on 2 typical earthquakes have been drawn; the difference of calibration results between Hokkaido and Honshu region in Japan is investigated. And calibration results of different directions, different epicenter distances and different magnitudes are probed into. The result shows that the location of earthquakes on the Shanghai seismic array is greatly improved.

关键词： Shanghai Array calibration Seismic array Apparent slowness

Dynamic analysis of mainstream area and vegetation coverage degree of Songhua River based on RS and GIS techniques

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Global Geology 2012年第1期15卷 66-73页

作者： CHANG Cheng ZHANG yuanqing zhu Cong College of Geo-Exploration Science and Technology Jilin University Changchun 130026 China

Based on remote sensing technique,using 1990's Landsat TM data and 2000's Landsat ETM data,the authors conducts the comparative study of mainstream area of Songhua River by means of human-computer inter-action *** results show that the area of Songhua River mainstream was 738 102 km 2 in 1990,and was 810.451 km 2 in *** 1990 to 2000,the increased area of river mainstream is up to 72.349 km2 due to soil erosion and water ***,the dynamic changes of surrounding vegetation cover are also *** is estimated that the trend of surrounding soil erosion and water loss of Songhua River mainstream becomes worse in Jilin Province.

关键词： water loss and soil erosion vegetation cover RS GIS Songhua River mainstream

Study on the Precise Location of the Xinjiang Yutian M_S7.3 Earthquake

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Earthquake Research in China 2015年第1期29卷 57-67页

作者： Zhan Xiaoyan Song Xiuqing Chen Xiangjun Wang Jun Miao Fajun Liu Shuangqing zhu yuanqing Earthquake Administration of Jiangsu Province Earthquake Administration of Shanghai Municipality Earthquake Administration of Xinjiang Uygur Autonomous Region Earthquake Administration of Tianjin Municipality

The seismic waveform of the Yutian Ms7. 3 earthquake, Xinjiang on February 12, 2014 was recorded clearly and completely by the Digital Seismic Networks of Xinjiang, Qinghai, Tibet, and Xinjiang Hotan array, so the method of joint location by regional seismic network and seismic array can be used to accurately determine the earthquake source location. The following technologies were used in the process of location：（ 1 ） We selected seismic stations equally located around the epicenter of the Ms 7. 3 earthquake with an average interval of about 15 degrees in the initial location. （2） The recording waveforms of Yutian seismic station were rotated to the radial and tangential directions to precisely obtain the arrival time of S-waves to determine the epicentral distance. （ 3） The velocity model was used in the determination of location of the epicenter, based on the historical records of earthquakes in the area within a radius of 1.0 ° from the source as the center, and the velocity model is obtained after re-fitting and calibration. （4） Based on the waveform records of the Hotan seismic array, the method of waveform beaming was used to determine the azimuths and perform the correction of the epicenter location with these azimuths. （5） The deterministic method was used to measure the source depth. Finally, it is concluded that the Yutian Ms 7. 3 main shock hypocenter location is 36. 197°N, 82. 467°E, focal depth 12km and original time 17：19：48. 2 μm. February 12, 2014.

关键词： Hypocentral location Digital seismic network Seismic array

Study on the Recurrence Probability of Strong Earthquakes of Faults

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Earthquake Research in China 2014年第2期28卷 152-163页

作者： zhu yuanqing Xie Chaodi Song Xiuqing Qin Haowen Earthquake Administration of Shanghai Municipality Department of Geophysics Yunnan University

Based on the physical model of Brownian passage time,the probabilities of recurrence of strong earthquakes on the major active faults in China are calculated in different predictive time spans,based mainly on the analysis of the earthquake preparation process before a strong earthquake occurs. Furthermore,the seismic risks on active faults are studied. The results show that the earthquake probabilities on the Xianshuihe fault,the Altyn Tagh fault,the east Kunlun fault and Xiaojiang fault are significantly greater than other faults in the Chinese mainland,which indicates that the level of stress accumulation on these faults are higher than on other faults. Therefore,these faults may have a seismic risk for strong earthquake in future.

关键词： Seismic risk Brownian passage time model Conditional probability Fault Earthquake recurrence

Research on the Algorithm CN Applied to Prediction of 23 Strong Earthquakes in China

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Earthquake Research in China 1995年第1期9卷 4-10页

作者： Huang Deyu Chen Yong zhu yuanqing Ji Ying

This paper researches TIP before 23 strong earthquakes occurring in the eastern part and the southern and northern zones of the western part of China and their nearby areas in recent *** results show that 18 strong earthquakes occurred within the diagnosed *** TIP precaution occupies about 30% of the total space-time domain which we researched,indicating quite good results of intermediate-term prediction of *** algorithm CN can thus be used as an intermediate-term prediction method for strong earthquakes.

关键词： Seismic activity Medium-term prediction