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Insufficient thermalization effects on determining fission-track ages

Science China Earth Sciences 2013年第10期56卷 1233-1241页

作者： PANG Jianzhang ZHENG DeWen WAN JingLin LI DaMing zhang peizhen YANG Jing State Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration

Fission-Track Dating (FTD) has been developed as a useful technique for geological studies. Parent elements are measured by counting 235 U tracks induced by thermal neutrons. If insufficient thermalization occurs, fission of 238 U and 232 Th will be induced, and further measurement error will be introduced. Therefore, whether the neutrons are well thermalized or not will affect the FTD results. Due to requirement of safe operation, the 101 reactor was terminated in 2007. By using the 492 reactor as the new thermal neutron reactor, our present paper will attempt to study the feasibility and the potential influence on FTD. By irradiating monitor glass SRM612 and CN5 in pairs, we will study the thermalization situation of the 492 reactor. Irradiated data show that thermal neutrons are not evenly distributed either in horizontal or in vertical dimension. Especially, horizontal heterogeneity is obvious. But we discovered that proper irradiation position in the reactor can meet the requirement of FTD. Under the current irradiation condition, we calculated and assessed the insufficient thermalization effects on determining fission-track ages. We found that the difference between the 232 Th/ 238 U ratios of samples and standards is the main factor to the experiment results. The results will not be affected if the 232 Th/ 238 U value of samples is equal to the standard samples. However, if the 232 Th/ 238 U ratio is larger than that of the standards, the results will be smaller than actual ages. Comparatively, the ages will be more than expected if the 232 Th/ 238 U ratio is less. Therefore, to reduce the irradiation error, we suggest either locating the position of irradiation strictly, or minimizing the influence of lateral heterogeneity by reducing the amount of each sample package. Additionally, accuracy of the experimental results can be improved by increasing standard samples to adjust ζ value and using the monitor of standard glass SRM612 and CN5 together.

关键词： neutron thermalization fission track dating 232Th/23SU ratio

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对中国地震学会发展的思考与展望——中国地震学会第十届理事会理事长张培震院士在第十次全国会员代表大会上的讲话

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地震科学进展 2020年第11期50卷 55-56页

作者：张培震中国地震学会北京100081

尊敬的各位老师、各位领导、各位同事:大家早晨好!中国地震学会第十届理事会推选我继续担任理事长,非常感谢大家对我的信任。我能力有限,工作单位和家都不在北京,曾多次明确表示不想再担任理事长一职。但由于种种原因,同事们还是推选了... 详细信息

尊敬的各位老师、各位领导、各位同事:大家早晨好!中国地震学会第十届理事会推选我继续担任理事长,非常感谢大家对我的信任。我能力有限,工作单位和家都不在北京,曾多次明确表示不想再担任理事长一职。但由于种种原因,同事们还是推选了我。既然大家信任,我当继续努力履行好理事长的职责,做好学会工作。

关键词：中国地震学会理事会理事长思考与展望会员代表大会信任

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Different earthquake patterns for two neighboring fault segments within the Haiyuan Fault zone

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Earth and Planetary Physics 2018年第1期2卷 67-73页

作者： ZhiKun Ren ZhuQi zhang peizhen zhang State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake Administration Key Laboratory of Active Tectonics and Volcanos Institute of GeologyChina Earthquake Administration School of Earth Science and Geological Engineering Sun Yat-Sen University

Characteristic slip and characteristic earthquake models have been proposed for several decades. Such models have been supported recently by high-resolution offset measurements. These models suggest that slip along a fault recurs via similarly sized, large earthquakes. The inter-event strain accumulation rate(ratio of earthquake slip and preceding interseismic time period) is used here to test the characteristic earthquake model by linking the slip and timing of past earthquakes on the Haiyuan Fault. We address how the inter-event strain accumulation rate varies over multiple seismic cycles by combining paleoearthquake studies with high-resolution airborne light detection and ranging(Li DAR) data to document the timing and size of paleoearthquake displacements along the western and middle segments of the Haiyuan Fault. Our observations encompass 5 earthquake cycles. We find significant variations over time and space along the Haiyuan Fault. We observe that on the middle segment of the Haiyuan Fault the rates slow down or increase as an anticorrelated function of the rates of preceding earthquakes. Here, we propose that the inter-event strain accumulation rates on the middle segment of the Haiyuan Fault are oscillating both spatially and temporally. However, along the western segment, the inter-event strain accumulation rate is both spatially and temporally steady, which is in agreement with quasi-periodic and slip-predictable models. Finally,we propose that different fault segments within a single fault zone may behave according to different earthquake models.

关键词： Haiyuan Fault LiDAR inter-event strain accumulation rates variation earthquake model

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开式呼吸蛙人专用氧气瓶声散射特性

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上海交通大学学报 2022年第6期56卷 764-771页

作者：张培珍林芳广东海洋大学电子与信息工程学院广东湛江524088

解决开式呼吸蛙人所携带的氧气瓶目标强度对目标全体散射的贡献问题,为掌握蛙人的精确特性预报和识别奠定基础.构建非轴对称激励下三维目标的二维有限元轴对称模型,运用声固耦合-频域多物理场接口计算不同方位声波照射目标散射远场的频... 详细信息

解决开式呼吸蛙人所携带的氧气瓶目标强度对目标全体散射的贡献问题,为掌握蛙人的精确特性预报和识别奠定基础.构建非轴对称激励下三维目标的二维有限元轴对称模型,运用声固耦合-频域多物理场接口计算不同方位声波照射目标散射远场的频率特性数值解,解释频率响应共振频率亮条纹产生的原因和估计公式.在线性声学的假设下,将有限元数值解作为系统函数,同带宽线性调频信号为系统输入信号,根据时域卷积定理得到时域回波仿真结果,结合亮点模型和弹性环绕波理论给出距离-角度时域回波的精确预报模型.结果表明:影响氧气瓶回波强度的主要因素为目标的镜反射和角反射,气瓶阀门和球冠等精细结构产生的附加亮点和环绕波对不同方位散射频率响应特性的影响不可忽略.通过收发合置的湖试实验,验证回波机理和散射指向分布共振频率特性预报的正确性.

关键词：有限元法距离-角度时域回波频率-角度谱亮点模型环绕波开式呼吸蛙人

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Discovery of the Surface Rupture Zone on the South of Helishan in Gaotai,Gansu Province

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Earthquake Research in China 2010年第1期24卷 97-105页

作者： Zheng Wenjun zhang peizhen Yuan Daoyang Ge Weipeng Liu Jianhui State Key Laboratory of Earthquake Dynamics Institute of Geology CEA Beijing 100029 China Lanzhou Institute of Seismology China Earthquake Administration Lanzhou 730000 China

According to a new investigation in the northern Hexi corridor,the remains of two surface rupture zones were discovered on the southern margin fault of the Helishan. One rupture has a length of approximately 7km and the other 10km. The two surface rupture zones might have been produced by the latest earthquake event. On the surface rupture is continuous scarp and free face caused by the rupture. The scarp is about 1 ～ 1. 5m high and on some sites,nearly up to 2m. According to the OSL results,the latest T1 terrace and higher flood plain forming in 3000a B. P. are dislocated by the fault. The above reveals the rupture age to be later than the T1 terrace. However,in the historical data and earthquake catalogue,we didn't find related information about the fault and surface rupture in this area. The 180 A. D. Biaoshi M8. 0 earthquake and the 756 A. D. zhangye-Jiuquan M7. 0 earthquake are documented in historical data. It is inferred by textual research that the two earthquakes are related to the northern marginal fault of Yumushan in the south of the basin. Due to a lack of reliable evidence,there are still many arguments on this inferred conclusion. Thus we hold that the two surface rupture zones were produced by one of the two large earthquakes or other unrecorded historical event. The research on the activity and surface rupture of this fault can offer valuable information for the tectonic study and strong earthquake risk estimates of this region in the future.

关键词： Surface rupture The Helishan southern margin fault The northern Tibet Gaotai, Gansu

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Modification to first-order Born approximation for improved prediction of scattered sound from weakly scattering objects

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Chinese Journal of Acoustics 2014年第3期33卷 228-238页

作者： zhang peizhen WANG Shuozhong WANG Runtian CHEN Yunfei WANG Luxian School of Communication and Information Engineering Shanghai University School of Information Guangdong Ocean University Shanghai Acoustics Laboratory Chinese Academy of Sciences Key Laboratory for Underwater Test and Control Technology

When deriving the Fourier diffraction theorem based on the first-order Born approximation,the difference between wave number of the scattering object and that of the surrounding medium is ignored,causing substantial errors in sound scattering *** paper modifies the Born approximation by taking into account the amplitude and phase changes between the scattering object and the water due to the wave number *** changing the radius and center position of the sampling circle in the Fourier domain,accuracy of the predicted sound scattering is *** the modified Born approximation,the computed far-field directional pattern of the scattered sound from a circular cylinder is in good agreement with the rigorous *** calculations for several objects with different shapes are used to show applicability and effectiveness of the proposed method.

关键词： Modification to first-order Born approximation for improved prediction of scattered sound from weakly scattering objects

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A Preliminary Study on the New Activity Features of the Lajishan Mountain Fault Zone in Qinghai Province

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Earthquake Research in China 2005年第4期19卷 391-401页

作者： Yuan Daoyang zhang peizhen Lei Zhongsheng Liu Baichi Liu Xiaolong Lanzhou Base of Institute of Earthquake Prediction CEA Lanzhou 730000 China Institute of Geology China Earthquake Administration Beijing 100029 China

The Lajishan Mountain fault zone consists of two NE_protruding arcuate faults, i.e. the northern and southern margin fault of Lajishan Mountain with the fault length of 230km and 220km respectively. The fault zone is located in the large_scale compressional structure zone and tectonic gradient zone in_between the NNW_trending right_lateral strike_slip Reshui_Riyueshan fault zone and the NWW_trending left_lateral strike_slip northern margin of west Qinling Ranges fault zone is also an important boundary fault zone, separating the Xining_Minhe basin and the Xunhua_Hualong basin at the southern and northern sides of the Lajishan Mountain respectively. Geologic geomorphic evidences of new activity revealed by field investigations indicate that the latest movement of the Lajishan fault zone was in late Epipleistocene (only a few segments were active in early Holocene) and is mainly of compressive thrusting with slightly left_lateral strike_slip component. The above movement has possibly resulted in the occurrence of about 20 moderate earthquakes of magnitude around 5.0. The Lajishan region can therefore be regarded as a seismotectonic window to reflect tectonic movement and earthquake activity.

关键词： Lajishan Mountain Active fault Historical earthquake New activity

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The effect of applying temperature stimulation to different positions in flexibility training of the hip joint

The effect of applying temperature stimulation to different ...

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2008奥林匹克科学大会

作者： zhang,peizhen Beijing Sports University,China

Introduction Flexibility is determined by the range of motion and the elasticity and extension ability of muscles, tendons and *** plays an important role in improving sport *** Flexibility is favourable in improving ... 详细信息

关键词： The effect of applying temperature stimulation to different positions in flexibility training of the hip joint

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Basic Characteristics of Active Structures in Western Sichuan and Its Vicinity and Strong Earthquake Recurrence Model

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Earthquake Research in China 2006年第1期20卷 75-89页

作者： Xu Xiwei zhang peizhen Wen Xueze Qin Zunli Chen Guihua Zhu Ailan Institute of Geology China Earthquake Administration Beijing 100029 China Earthquake Administration of Sichuan Province Chengdu 610041 China Beijing Guodian Water Conservancy and Electrical Engineering Co. Ltd. Beijing 100024 China

Western Sichuan and its vicinity are located in the juncture of three big active blocks, namely, the Chuandian （Sichuan and Yunnan）, the Bayan Har and the South China blocks, on the eastern margin of the Qinghai-Xizang（Tibet） Plateau. Many groups of active faults that are capable of generating earthquakes are developed there. Because there exist lateral secondary active faults, the Chuandian block can be further divided into the central Yumlan and northwestern Sichuan sub-blocks; while the Longmenshan sub-block can be divided on the east end of the Bayan Har block. Joint exploration of deep crustal structure shows that there exist low-velocity and high-conductivity layers in the crust of the Chuandian and Bayan Har blocks, which are one of the important factors that make the upper crust prone to earthquake. The results of geological study and modern GPS observation show that blocks of different orders all have SE- or SSE-trending sliding, clockwise rotation and upwelling movement; but there are some differences in amplitude. This paper has also given the geological or GPS slip rates of main active fault zones and discussed the main scientific problems still existing now.

关键词： Western Sichuan Active tectonics Active block Strong earthquake recurrence model

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SEISMIC HAZARD ASSESSMENT AND EARTHQUAKE DISASTER MITIGATION IN CHINA

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Natural Disaster Reduction in China 1996年第1期 8-17页

作者： zhang peizhen(Institute of Geology,State Seismological Bureau,Beijing 100029,P.R.China)

ＳＥＩＳＭＩＣＨＡＺＡＲＤＡＳＳＥＳＳＭＥＮＴＡＮＤＥＡＲＴＨＱＵＡＫＥＤＩＳＡＳＴＥＲＭＩＴＩＧＡＴＩＯＮＩＮＣＨＩＮＡＺｈａｎｇＰｅｉｚｈｅｎ（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｌｏｇｙ，ＳｔａｔｅＳｅｉｓｍｏｌｏｇｉ...

ＳＥＩＳＭＩＣＨＡＺＡＲＤＡＳＳＥＳＳＭＥＮＴＡＮＤＥＡＲＴＨＱＵＡＫＥＤＩＳＡＳＴＥＲＭＩＴＩＧＡＴＩＯＮＩＮＣＨＩＮＡＺｈａｎｇＰｅｉｚｈｅｎ（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｌｏｇｙ，ＳｔａｔｅＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕ，Ｂｅｉｊｉｎｇ...

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