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Tectonic Stress State Changes Before and After the Wenchuan M_s 8.0 Earthquake in the Eastern Margin of the Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2015年第1期89卷 77-89页

作者： MENG Wen CHEN Qunce WU Manlu feng chengjun QIN Xianghui Key Laboratory of Neotectonic Movement and Geohazard Ministry of Land and Resources Institute of Geomechanics Chinese Academy of Geological Science

Crustal tectonic activities are essentially the consequences of the accumulation and release of in situ stress. Therefore, studying the stress state near active faults is important for understanding crustal dynamics and earthquake occurrences. In this paper, using in situ stress measurement results obtained by hydraulic fracturing in the vicinity of the Longmenshan fault zone before and after the Wenchuan Ms 8.0 earthquake and finite element modeling, the variation of stress state before and after the Wenchuan M. 8.0 earthquake is investigated. The results show that the shear stress, which is proportional to the difference between principal stresses, increases with depth and distance from the active fault in the calm period or after the earthquakes, and tends to approach to the regional stress level outside the zone influenced by the fault. This distribution appears to gradually reverse with time and the change of fault properties such as frictional strength. With an increase in friction coefficient, low stress areas are reduced and areas with increased stress accumulation are more obvious near the fault. In sections of the fault with high frictional strengths, in situ stress clearly increases in the fault. Stress accumulates more rapidly in the fault zone relative to the surrounding areas, eventually leading to a stress field that peaks at the fault zone. Such a reversal in the stress field between the fault zone and surrounding areas in the magnitude of the stress field is a potential indicator for the occurrence of strong earthquakes.

关键词： Wenchuan Ms 8.0 earthquake stress state in situ stress measurement finite elementmethod Longmenshan active fault zone

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Crustal Stress State and Seismic Hazard along Southwest Segment of the Longmenshan Thrust Belt after Wenchuan Earthquake

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Journal of Earth Science 2014年第4期25卷 676-688页

作者： Xianghui Qin Chengxuan Tan Qunce Chen Manlu Wu chengjun feng Institute of Geomechanics Chinese Academy of Geological Sciences Key Laboratory of Neotectonic Movement & Geohazard Ministry of Land and Resources

The crustal stress and seismic hazard estimation along the southwest segment of the Longmenshan thrust belt after the Wenchuan Earthquake was conducted by hydraulic fracturing for in-situ stress measurements in four boreholes at the Ridi, Wasigou, Dahegou, and Baoxing sites in 2003, 2008, and 2010. The data reveals relatively high crustal stresses in the Kangding region （Ridi, Wasigou, and Dahegou sites） before and after the Wenchuan Earthquake, while the stresses were relatively low in the short time after the earthquake. The crustal stress in the southwest of the Longmenshan thrust belt, especially in the Kangding region, may not have been totally released during the earthquake, and has since increased. Furthermore, the Coulomb failure criterion and Byerlee＇s law are adopted to analyzed in-situ stress data and its implications for fault activity along the southwest segment. The magnitudes of in-situ stresses are still close to or exceed the expected lower bound for fault activity, revealing that the studied region is likely to be active in the future. From the conclusions drawn from our and other methods, the southwest segment of the Longmenshan thrust belt, especially the Baoxing region, may present a future seismic hazard.

关键词： Wenchuan Earthquake Longmenshan thrust belt in-situ stress measurement crustal stress state Coulomb failure criterion seismic hazard.

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The Stress State of the Beichuan-Jiangyou Segment of the Longmenshan Fault before and after the Wenchuan M_S 8.0 Earthquake

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Journal of Earth Science 2014年第5期25卷 861-870页

作者： chengjun feng Qunce Chen Chengxuan Tan Xianghui Qin Peng Zhang Wen Meng Institute of Geomechanics Chinese Academy of Geological Sciences Key Laboratory of Neotectonic Movement & Geohazard Ministry of Land and Resources

After the Wenchuan MS 8.0 Earthquake, which occurred on May 12, 2008, in Sichuan Province, China, we conducted a series of hydraulic fracturing stress measurements in three 200 m deep boreholes（ZK01, ZK02, and ZK03） drilled in Beichuan and Jiangyou regions near the northeastern segment of Longmenshan fault belt in 2009. These measurements revealed the near-surface stress field in the fault region one year after the Wenchuan MS 8.0 Earthquake. However, the lack of the stress measurements before the earthquake in the same region makes it difficult to understand variations of the in situ stress field（near-surface） by comparative analysis. In order to determine the unknown horizontal principal stresses before the earthquake in Beichuan and Jiangyou regions, the following research method was tentatively applied. Firstly, we calculate the static co-seismic stress field by linear elastic finite element numerical simulation with ANSYS, based on the co-seismic static displacement generated by the Wenchuan MS 8.0 Earthquake along the central Longmenshan fault plane in Beichuan and Jiangyou. Secondly, combining hydraulic fracturing measurements（after the earthquake） with the co-seismic stress（simulation）, the magnitudes and orientations of horizontal principal stresses before the earthquake were calculated. Finally, the variation of the in situ stress（near-surface） in Beichuan and Jinagyou, both before and after the Wenchuan MS 8.0 Earthquake, were obtained by comparative analysis. To do this the magnitude of SHmax was decreased on average by 13.01 and 6.54 MPa after the earthquake in ZK02 and ZK03, respectively and the magnitude of SHmin was decreased by 2.54 and 5.29 MPa in ZK02 and ZK03, respectively. Following the earthquake, the average direction of SHmax rotated anticlockwise by 42.5°.

关键词： Longmenshan fault belt hydraulic fracturing situ stress co-seismic stress numerical simulation.

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Reexamining the Seismological Implications of the Present-day Stress State of the Yingxiu-Beichuan Fault after the Wenchuan Earthquake

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Acta Geologica Sinica(English Edition) 2016年第2期90卷 567-577页

作者： QIN Xianghui CHEN Qunce feng chengjun DU Jianjun WU Manlu MENG Wen SUN Dongsheng Institute of Geomechanics Chinese Academy of Geological Sciences Key Laboratory of Neotectonic Movement and Geohazard Ministry of Land and Resources

The present-day stress state of the Yingxiu-Beichuan fault after the Wenchuan earthquake was re-estimated using measured in-situ stress data obtained after the Wenchuan earthquake. The results reveal that the gradient coefficients of principal stresses versus depth decrease from south to north along the Yingxiu-Beichuan fault, revealing that the stress level decreases from south to north. The consistency between the present-day stress levels and surface ruptures generated during the earthquake indicates that the accumulated tectonic stress beneath the Yingxiu-Beichuan fault before the Wenchuan earthquake was relieved in form of surface ruptures. This resulted in the stress remaining high in the southern section of the Yingxiu-Beichuan fault but relatively low in the northern section. Abnormal high pore pressure conditions and an extremely low frictional coefficient play important role in the interpretation of the stress field adjustment and seismic events observed after the Wenchuan earthquake along this fault, according to the estimation results using the Coulomb frictional-failure theory incorporating frictional coefficients ranging from 0.4 to 1.0. To accurately estimate the seismological hazard of the Yingxiu-Beichuan fault by analyzing fault instability using the Coulomb frictional-failure theory, much attention should be focused on the pore pressure conditions and the evolution state of the frictional coefficient under the present-day stress state.

关键词： stress state fault activity seismological hazard Coulomb frictional-failure theory Yingxiu-Beichuan fault

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论信息交流(一)

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情报科学 1989年第4期10卷 1-10页

作者：丰成君武汉大学图书情报学院

本文从广义情报角度探讨了信息的本质,提出了信息流的传递律、复加律、发散律、递减律与守恒律,分析了人脑的信息表征与处理过程,并将信息分为自然信息、主观信息和客观信息三种形式。

关键词：信息交流信息

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Some Applications of E-wavelet Multipliers

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Chinese Quarterly Journal of Mathematics 2004年第3期19卷 292-299页

作者： LIDeng-feng chengjun-fang CollegeofMathematicsandInformationScience HenanUniversityKaifeng475001China

Let E= .A measurable function v is called an E- waveletmultiplier if (vψ) is an E-wavelet whenever ψ is an E-wavelet. Some characterizations and applications of E-wavelet multiplier were considered in [1]. In this paper, we give some other applications of E-wavelet multiplier, and prove that the set of all MRA E-wavelets is arcwise connected.

关键词： wavelet wavelet multiplier multiresolution analysis

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日本M_W9.0级大地震前后华北和东北地区现今构造应力作用调整过程与研究意义探讨

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地学前缘 2015年第1期22卷 345-359页

作者：谭成轩胡秋韵张鹏丰成君秦向辉中国地质科学院地质力学研究所北京100081 国土资源部新构造运动与地质灾害重点实验室北京100081 中国地质调查局北京100037

为了探讨日本MW9.0级大地震前后华北和东北地区现今构造应力作用调整过程与研究意义,对华北和东北地区进行原位现今地应力绝对测量与实时监测、GPS测量,结果表明:日本大地震在山东半岛、华北北部地区和东北地区所诱发同震位移引起的张... 详细信息

为了探讨日本MW9.0级大地震前后华北和东北地区现今构造应力作用调整过程与研究意义,对华北和东北地区进行原位现今地应力绝对测量与实时监测、GPS测量,结果表明:日本大地震在山东半岛、华北北部地区和东北地区所诱发同震位移引起的张性效应调整周期分别约为6个月(即调整结束时间大约在2011年9月)、15个月(即调整结束时间大约在2012年6月)和26个月(即调整结束时间大约在2013年5月),张性效应调整周期与同震位移大小成正比。在这种调整过程中,往往表现出区域现今构造应力作用方式和构造应力场转换,并可能伴随重大地质事件(如地震等)的发生。2012年5月28日和29日、6月18日、8月26日及2013年1月11日在唐山及其周围地区分别发生的4.8级、3.2级、4.0级、3.3级和3.0级地震与华北北部地区构造应力作用方式和构造应力场转换有关,而2013年10月31日以来在吉林省松原市发生的地震群应与东北地区构造应力作用方式和构造应力场转换有关,而非一个大地震前的小震群。

关键词：原位现今地应力绝对测量与实时监测 GPS测量张性效应调整周期构造应力作用方式和构造应力场转换松原震群

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金州断裂带北段深孔地应力测量及其活动性

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地球科学（中国地质大学学报） 2014年第10期39卷 1295-1306页

作者：张鹏丰成君孙炜峰杨海雨谭成轩国土资源部新构造运动与地质灾害重点实验室北京100081 中国地质科学院地质力学研究所北京100081 中国地质大学工程技术学院北京100083

为查明辽东半岛金州地震活动断裂带现今地应力状态和活动状况,在该断裂带北段熊岳城东侧开展了随深度系统地取心钻探和水压致裂地应力测量工作,完成了600 m钻探深度范围内地应力测量试验27段和水平最大主应力方向测试5段.钻探岩心初步... 详细信息

为查明辽东半岛金州地震活动断裂带现今地应力状态和活动状况,在该断裂带北段熊岳城东侧开展了随深度系统地取心钻探和水压致裂地应力测量工作,完成了600 m钻探深度范围内地应力测量试验27段和水平最大主应力方向测试5段.钻探岩心初步揭示了地壳浅表层的岩体结构特征;随深度系统的地应力测量结果表明,3个主应力关系为SV〉SH〉Sh,垂直应力起主导作用,易于正断作用发生;现今最大水平主应力方向为56°-81°NE,反映NNE走向的金州断裂带北段现今活动具有右行走滑特征.地应力测量结果揭示的金州断裂带正断兼右行走滑特征与已有的该区域研究成果相吻合,为其现今活动性研究补充了新的动力学数据.

关键词：辽东半岛金州断裂带水压致裂库伦准则正断层地震

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MBR工艺机械性预处理系统的选择与设计

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给水排水 2010年第5期36卷 37-40页

作者：蒋岚岚胡邦冯成军无锡市政设计研究院有限公司无锡214072

污水预处理对污水处理厂的正常运行起着重要的作用。结合无锡市城北污水处理厂设计实例,详细介绍了MBR工艺的整套机械性预处理系统的组成及各种预处理机械设备的工作原理、选型要求、安装位置和主要技术参数。

关键词：污水处理厂 MBR工艺预处理格栅

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基于Nrf2/ARE信号通路探讨白藜芦醇治疗非酒精性脂肪性肝炎大鼠的作用机制

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中国临床解剖学杂志 2021年第5期39卷 579-585页

作者：冯成军周艳萌田应娟遵义医科大学第三附属医院感染科贵州遵义563000 遵义医科大学微生物学与免疫学实验室贵州遵义563000 遵义市播州区中医院B超科贵州遵义563000

目的基于Nrf2/ARE信号通路探讨白藜芦醇治疗非酒精性脂肪性肝炎大鼠的作用机制。方法利用高脂饮食法进行非酒精性脂肪性肝炎大鼠造模。大鼠分为对照组(CD组)、高脂饮食组(HCD组)、白藜芦醇组(HCD+RSV组)及(白藜芦醇+OAD85)组(HCD+RSV+OA... 详细信息

目的基于Nrf2/ARE信号通路探讨白藜芦醇治疗非酒精性脂肪性肝炎大鼠的作用机制。方法利用高脂饮食法进行非酒精性脂肪性肝炎大鼠造模。大鼠分为对照组(CD组)、高脂饮食组(HCD组)、白藜芦醇组(HCD+RSV组)及(白藜芦醇+OAD85)组(HCD+RSV+OAD85组),每组8只。CD组始终喂养普通饲料,其他组自由高脂饮食。(HCD+RSV)组及(HCD+RSV+OAD85)组在喂养第4周开始灌胃给予10 mg/kg RSV或(10 mg/kg RSV+100μg/kg OAD85),连续灌胃给药28 d(OAD85为Nrf2/ARE抑制剂齐墩果酸衍生物)。HE染色观察肝组织病理学改变,肝组织冰冻切片油红O染色观察脂肪量变化,试剂盒检测ALT、AST、TC、TG、HDL、LDL和FFA,Western-blot和qRT-PCR检测Keap1、Nrf2、ARE、NQO1、HO-1蛋白和mRNA表达。结果与CD组相比,HCD组肝脂肪变性、小叶炎症、门静脉炎症、肿胀程度NASH评分、脂肪含量及血清中ALT、AST升高(P0.05)。与CD组相比,HCD组NQO1、HO-1、Nrf2、ARE蛋白及mRNA表达均明显升高(P0.05)。结论白藜芦醇治疗非酒精性脂肪性肝炎大鼠可能是基于Nrf2/ARE信号通路激活机制,从而改善氧化应激水平,可减轻肝病理损伤。

关键词： Nrf2/ARE 白藜芦醇非酒精性脂肪性肝炎 HCD

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