检索结果-南通市图书馆

Differences in both the structure and interaction of the crust and mantle on the eastern and western sides of the Ordos Block

引用

Science China Earth Sciences 2024年

作者： Yong chen Yifang chen jiuhui chen Biao GUO Yu LI Panpan ZHAO State Key Laboratory of Seismic Dynamics Institute of GeologyChina Earthquake Administration National Field Scientific Observatory for Continental Rift Valley Dynamics in Taiyuan Institute of Earthquake Forecasting China Earthquake AdministrationKey Laboratory for Earthquake Prediction

The Ordos Block, the western part of the North China Craton (NCC), has preserved most of its cratonic lithospheric roots during the destruction and modification of the NCC, and nowconnects two distinctly different tectonic units, i.e., the Tibetan Plateau (TP) to the west and the North China Plain to the east. It is important to studythe detailed crust-mantle structure of the Ordos Block and surroundings to understand the interactions between the Ordos and adjacent regions and the dynamics of the NCC evolution. In this study, the S-wave velocity structure at depths of 0–100 km along an E-W profile at around 36.5°N from the Qilian orogen (QLO) to the Trans-North China Orogen (TNCO) within the NCC was investigated by joint inversion of the receiver functions (RFs) and surface wave dispersion data from 104 broadband seismic stations deployed in the region under the ChinArray project (Phase Ⅱ and Phase Ⅲ). The image of discontinuity structures along the profile was further constructed by common conversion point stacking of RFs. The main results are as follows:(1) The depth of the Moho in the study region gradually decreases from west to east, being the deepest in the QLO, the second in the Ordos Block, and the shallowest in the TNCO. Local depression and uplift of the Moho are also identified beneath the Haiyuan fault zone and the Shanxi-Shaanxi rift system (SSR), respectively.(2) The crust-mantle structure displays obvious lateral heterogeneities among tectonic regions. A pronounced low-velocity anomaly is observed at depths of 20–40 km beneath the QLO and becomes weakened and thinned to the east, indicating that thickening of the mid-to-lower crust probably occurred in the QLO during the growth and lateral extrusion of the northeastern TP under the resistance of the NCC. The lithosphere-asthenosphere boundary beneath the TNCO is imaged at～90 km depth, which is significantly shallower than that beneath the Ordos *** observation suggests that the lithosphere of t

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Pathways toward a pollution-free planet and challenges

引用

Frontiers of Environmental Science & Engineering 2024年第6期18卷 3-8页

作者： jiuhui Qu Jiaping chen School of Environment Tsinghua UniversityBeijing 100084China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China

The mission of“Establishment of Zero-Pollution Earth”defined by United Nations Environment Programme aims at creation of a clean,safe and prosperous home for all human *** is of rational choice from each individual to protect our environment and demonstrates our great ambition to achieve our *** key message given in this article is that,zero pollution does not mean no discharge of pollutants and instead it can be achievable through optimizing and controlling a sound balance between pollutants discharge and capacities of decontamination through treatment and natural environmental accumulation,which can be termed as“Principle of Equilibrium”between pollution and *** on this principle,we propose and illustrate several key factors and synergistic pathways toward a pollution-free planet:quantitative determination on purification and wastewater;source control through green measures;minimization of negative side-effects;precise management through digitalized systems;and keeping sound balance between pollutants and natural *** should be noted that we would face a series of difficulties and challenges in moving forward to“Zero-Pollution Earth”.We should further develop theories,principles and tools to achieve the balance between quantity of pollutants and decontamination *** should work together to break through the bottleneck limited by“Principle of equilibrium”to establish new environmental remediation systems leading to“Zero-Pollution Earth”.

关键词： Wastewater treatment Resources Recovery Greenhouse gases Energy Pollution-free

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

鄂尔多斯及邻区地壳S波速度和各向异性结构的全波形层析成像研究

引用

地球物理学进展 2024年第1期39卷 48-62页

作者：杨镓文侯卫生陈九辉李俊毅郑文俊中山大学地球科学与工程学院广东省地球动力作用与地质灾害重点实验室珠海519082 南方海洋科学与工程广东省实验室(珠海) 珠海519082 中国地震局地质研究所地震动力学国家重点实验室北京100029

鄂尔多斯及邻区一直是研究活动地块间相互作用和物质运移的热点区域.青藏高原的扩展与鄂尔多斯地块内部及周缘的变形之间的耦合关系仍有待厘定.基于“中国地震科学台阵探测”项目的密集台阵和固定台网数据,本文利用区域地震全波形层析... 详细信息

鄂尔多斯及邻区一直是研究活动地块间相互作用和物质运移的热点区域.青藏高原的扩展与鄂尔多斯地块内部及周缘的变形之间的耦合关系仍有待厘定.基于“中国地震科学台阵探测”项目的密集台阵和固定台网数据,本文利用区域地震全波形层析成像方法获得了研究区三维S波速度和径向各向异性结构,结果表明:鄂尔多斯地块存在以37°N为界的南北速度结构差异,南部的相对低速反映了较厚的地壳,与地形地貌相对应;鄂尔多斯西南缘在中、上地壳表现为负径向各向异性结构特征,S波速度扰动在中地壳呈显著的低速异常,延伸到鄂尔多斯西南部,该区域作为青藏高原扩展的前缘,速度结构特征反映了中地壳滑脱,上地壳缩短变形的地壳增厚模式;具有扩展早期构造变形特征的阿拉善地块南部呈相对低速,在上地壳表现为明显的负径向各向异性;鄂尔多斯东缘的山西断陷带存在南北速度结构差异,断陷带北部下地壳为低速异常,反映受地幔热物质改造的软弱物质堆积,断陷带中部则呈相对高速结构特征,推测其深部构造应力、应变环境比较稳定;负径向各向异性结构在南北地震带北段和山西断陷带浅部均有分布,为深入研究地震活动性与地壳速度结构的关系提供了波形成像证据.

关键词：鄂尔多斯地块全波形层析成像径向各向异性三维地壳速度结构

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Crustal structure beneath the Qilian Orogen Zone from multiscale seismic tomography

引用

Earth and Planetary Physics 2019年第3期3卷 232-242页

作者： Biao Guo jiuhui chen QiYuan Liu Shuncheng Li State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake Administration

The Qilian Orogen Zone(QOZ), located in the north margin of the Tibetan Plateau, is the key area for understanding the deformation and dynamics process of Tibet. Numerous geological and geophysical studies have been carried out on the mechanics of the Tibetan Plateau deformation and uplift; however, the detailed structure and deformation style of the Qilian Orogen Zone have remained uncertain due to poor geophysical data coverage and limited resolution power of inversion algorithms. In this study, we analyze the P-wave velocity structure beneath the Qilian Orogen Zone, obtained by applying multi-scale seismic tomography technique to P-wave arrival time data recorded by regional seismic networks. The seismic tomography algorithm used in this study employs sparsity constraints on the wavelet representation of the velocity model via L1-norm regularization. This algorithm can deal efficiently with uneven-sampled volumes, and can obtain multi-scale images of the velocity model. Our results can be summarized as follows:(1) The crustal velocity structure is strongly inhomogeneous and consistent with the surface geological setting. Significant low-velocity anomalies exist in the crust of northeastern Tibet, and slight high-velocity anomalies exist beneath the Qaidam Basin and Alxa terrane.(2)The Qilian Orogen Zone can be divided into two main parts by the Laji Shan Faults: the northwestern part with a low-velocity feature, and the southeastern part with a high-velocity feature at the upper and middle crust.(3) Our tomographic images suggest that northwestern and southeastern Qilian Orogen Zones have undergone different tectonic processes. In the northwest Qilian Orogen Zone, the deformation and growth of the Northern Tibetan Plateau has extended to the Heli Shan and Beida Shan region by northward overthrusting at the upper crust and thickening in the lower crust. We speculate that in the southeast Qilian Orogen Zone the deformation and growth of the Northern Tibet Plateau w

关键词： Qilian Orogen Zone crustal structure multi-scale seismic tomography

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efficient Metal Recovery from Industrial Wastewater:Potential Oscillation and Turbulence Mode for Electrochemical System

引用

Engineering 2024年第7期38卷 184-193页

作者： Li chen Gong Zhang Huijuan Liu Shiyu Miao Qingbai chen Huachun Lan jiuhui Qu Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China

Efficient metal recovery from industrial wastewater facilitates addressing of the environmental hazards and resource requirements of heavy *** conventional electrodeposition recovery method is hampered by the limitations of interfacial ion transport in charge-transfer reactions,creating challenges for simultaneous rapid and high-quality metal ***,we proposed integrating a transient electric field(TE)and swirling flow(SF)to synchronously enhance bulk mass transfer and promote interfacial ion *** investigated the effects of the operation mode,transient frequency,and flow rate on metal recovery,enabling determination of the optimal operating conditions for rapid and efficient sequential recovery of Cu in TE&SF *** conditions included low and high electric levels of 0 and 4 V,a 50%duty cycle,1 kHz frequency,and 400 L·h^(-1)flow *** kinetic coefficients of TE&SF electrodeposition were 3.5-4.3 and 1.37-1.97 times that of single TE and SF electrodeposition,*** the deposition process under TE and SF conditions confirmed the efficient concurrence of interfacial ion transport and charge transfer under TE and SF synergy,which achieved rapid and highquality metal ***,the combined deposition strategy is considered an effective technique for reducing metal pollution and promoting resource recycling.

关键词： Ion transport Reaction kinetics Transient electric field Swirling flow

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Shear wave velocity structure of the crust and upper mantle underneath the Tianshan orogenic belt

引用

Science China Earth Sciences 2007年第3期50卷 321-330页

作者： LI Yu LIU QiYuan chen jiuhui LI Shuncheng GUO Biao LAI YuanGen State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China

From April, 2003 to September, 2004, a passive broadband seismic array consisting of 60 stations was deployed over the Tianshan orogenic belt by State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration. Among them, 51 stations make up an about 500-km-long profile across the Tianshan Mountains from Kuytun to Kuqa. The receiver function profile and S-wave velocity structure of the crust and upper mantle down to 100 km deep are obtained by using the re-ceiver function method (Liu et al. 1996, 2000). The main results can be summarized as follows: (1) A clear mountain root does not exist beneath the Tianshan Mountains, and the crust-mantle boundaries underneath the stations mostly have transitional structures. This implies that the material differentia-tion between the crust and mantle is not yet accomplished and the orogenic process is still going on. (2) The crust beneath the Tianshan Mountains has laterally blocked structures in direction perpendicular to the mountain strike, and the crust-mantle boundary has a clear dislocation structure. Both of them correspond to each other. (3) The offsets of the Moho discontinuity are highly correlated to the tectonic borders on the surface and that corresponding to the frontal southern Tianshan fault reaches to 14 km. This manifests that large vertical divergent movement took place between different blocks. This sup-ports the discontinuous model of the Tianshan orogeny, and the Tarim block subduction is restricted only to the southern side of the South Tianshan. (4) Inside the upper and middle crust of the Tianshan Mountains exist several low-velocity bodies correlated with high seismicity located on the moun-tain-basin jointures on both sides of the mountain and between different blocks, and the low-velocity bodies on the mountain-basin jointures are inclined obviously to the mountain. This implies that the low-velocity bodies may be correlated closely to the thrust and subduction of th

关键词： nonlinear inversion receiver function S-wave velocity crust and upper mantle Tianshan orogenic belt

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Method to calculate interior sound field of arbitrary-shaped closed thin shell

引用

Chinese Journal of Acoustics 2001年第1期20卷 81-87页

作者： WU jiuhui,chen Hualing,HU Xuanli (Institute of Vibration & Noise Control Engineering, Xi’an Jiaotong University Xi’an 710049) Institute of Vibration & Noise Control Engineering Xi'an Jiaotong University Xi'an710049

The concept of covering-domain means that an arbitrary-shaped closed shell can be approached by a series of closed spherical shells. Based on it, the interior scattering sound field of the arbitrary-shaped closed shell is given. According to the reciprocity theory, the radiating sound field of the elastic surface due to the action of external force is presented. The method presented can also be used to calculate the interior sound fields of arbitraryshaped closed thin shells of which the thickness are either equal or unequal. It is verilied to be correct by corresponding test.

关键词： Method to calculate interior sound field of arbitrary-shaped closed thin shell

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

横向非均匀介质远震体波接收函数的波场特征

引用

地震学报 2000年第6期22卷 614-621页

作者：陈九辉刘启元中国地震局地质研究所中国北京100029

系统研究了台站下方存在倾斜界面时 ,远震体波接收函数的波场特征及多方位接收函数对台站下方介质横向非均匀特征的反映能力 .我们利用合成三维横向非均匀介质接收函数的 Maslov方法 ,具体模拟了台站下方存在倾斜界面时的接收函数响应 ... 详细信息

系统研究了台站下方存在倾斜界面时 ,远震体波接收函数的波场特征及多方位接收函数对台站下方介质横向非均匀特征的反映能力 .我们利用合成三维横向非均匀介质接收函数的 Maslov方法 ,具体模拟了台站下方存在倾斜界面时的接收函数响应 .结果表明 ,当台站下方存在倾向一致的倾斜界面时 ,远震体波接收函数的径向分量和切向分量分别随震源方位角的变化呈现对称和反对称的规律性变化 .利用不同震源方位角接收函数径向分量和切向分量的变化规律 ,可以估计台站下方界面的倾向和倾角 .当台站下方各界面的倾向不同时 ,随方位角的变化 ,接收函数只能直观给出界面的整体倾向 .实际观测数据的分析结果表明 ,对于利用单个台站接收函数研究台站下方介质的横向非均匀特征来说 ,简单倾斜界面可以看作较好的一级近似 .

关键词：波场特征接收函数横向非均匀介质远震体波 Maslov法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

接收函数曲波变换去噪与偏移成像

引用

地球物理学报 2019年第6期62卷 2027-2037页

作者：陈一方陈九辉郭飚齐少华赵盼盼中国地震局地质研究所地震动力学国家重点实验室

增强接收函数偏移图像的垂向分辨率意味着提高参与叠加的接收函数的频率,但是采用高频接收函数通常伴随着对接收函数质量和参考速度模型的更高要求.通过叠加处理可去除部分接收函数中的随机噪声干扰,但同一台站的接收函数之间经常存在... 详细信息

增强接收函数偏移图像的垂向分辨率意味着提高参与叠加的接收函数的频率,但是采用高频接收函数通常伴随着对接收函数质量和参考速度模型的更高要求.通过叠加处理可去除部分接收函数中的随机噪声干扰,但同一台站的接收函数之间经常存在难以通过简单叠加消除的噪声信号.压制接收函数随机噪声的干扰可加强成像效果和提高图像分辨率,对推进叠加偏移成像质量的提高有重要的实际意义.本文利用在川西地区布设的31个流动台站所记录的远震波形数据,使用曲波变换去噪后信噪比增强的接收函数进行共转换点叠加(CCP),获得沿北纬31°线下方800km深度范围内速度间断面图像.研究结果表明:(1)对接收函数进行曲波变换去噪,可压制随机噪声,增强转换震相的追踪性,提高数据信噪比;(2)通过去噪处理,大幅提高接收函数用于偏移成像的主频率;(3)偏移结果确认了接收函数反演得到的松潘和川滇块体下方具有厚度约10~20km的过渡性Moho的认识;(4)上地幔过渡带的结果预示在龙门山断裂带以西的小范围内有可能存在下地壳或上地幔物质的拆沉.

关键词：接收函数曲波变换偏移成像川西地区

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

西藏米林M6.9地震早期余震时空分布特征

引用

地球物理学报 2018年第6期61卷 2322-2331页

作者：尹昕忠周本刚陈九辉韦伟谢超郭志中国地震局地质研究所地震动力学国家重点实验室北京100029 中国地震局地质研究所中国地震局活动构造与火山重点实验室北京100029 中国地震局地震预测研究所北京100036

北京时间2017年11月18日06时34分(GMT:2017-11-17 22∶34),西藏自治区林芝市米林县发生了M6.9地震.本次地震位于东喜马拉雅东构造结末端旋转变形强烈部位.本研究基于林芝台阵记录的波形数据,应用双差定位方法和匹配滤波方法对本次地震... 详细信息

北京时间2017年11月18日06时34分(GMT:2017-11-17 22∶34),西藏自治区林芝市米林县发生了M6.9地震.本次地震位于东喜马拉雅东构造结末端旋转变形强烈部位.本研究基于林芝台阵记录的波形数据,应用双差定位方法和匹配滤波方法对本次地震早期余震序列进行了全面检测分析.截至2017年11月25日上午08时,我们共获得约10倍的中国地震台网公布的余震事件.余震的时空分布特征显示,本次米林M6.9地震余震呈NW向,位于北东向南迦巴瓦构造结北部的东西两侧边界断裂带之间,沿西兴拉断裂带分布,断层具有明显的分段破裂特征,主震位于余震分布带中部.根据余震分布特征以及震源机制解显示,发震断层的深部几何结构为北东向陡倾,主震北东侧的断层活动为主震及发震断层触发的结果,其深部几何结构也较陡,余震整体沿断层分布长度约50km.

关键词：米林M6.9地震微震检测发震构造东喜马拉雅构造结

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：