检索结果-南通市图书馆

Upper crust structure of eastern A’nyemaqên suture zone: Results of Barkam-Luqu-Gulang deep seismic sounding profile

引用

Acta Seismologica Sinica(English Edition) 2007年第6期20卷 628-640页

作者：张先康geophysical exploration center China Earthquake Administration 杨卓欣geophysical exploration center China Earthquake Administration 徐朝繁geophysical exploration center China Earthquake Administration 潘纪顺geophysical exploration center China Earthquake Administration 刘志geophysical exploration center China Earthquake Administration 王夫运geophysical exploration center China Earthquake Administration 嘉世旭geophysical exploration center China Earthquake Administration 赵金仁geophysical exploration center China Earthquake Administration 张成科geophysical exploration center China Earthquake Administration 孙国伟 geophysical exploration center China Earthquake Administration

Barkam-Luqu-Gulang deep seismic sounding profile runs from north of Sichuan Province to south of Gansu Province. It is located at the northeastern edge of Tibetan Plateau and crosses eastern A＇nyemaqên suture zone. The upper crust structures around eastern A＇nyemaqên suture zone and its adjacent area are reconstructed based on the arrival times of refracted Pg and Sg waves by using finite difference method, ray tracing inversion, time-term method and travel-time curve analysis. The results show that the depth variation of basement along profile is very strong as indicated by Pg and Sg waves. The basement rose in Zoigê basin and depressed in eastern A＇nyemaqên suture zone, and it gradually rose again northward and then depressed. The results also indicate that eastern A＇nyemaqên suture zone behaves as inhomogeneous low velocity structures in the upper crust and is inclined to- ward the south. Hoh Sai Hu-Maqên fault, Wudu-Diebu fault and Zhouqu-Liangdang fault are characterized by low velocity distributions with various scales. The distinct variation in basement depth occurred near Hoh Sai Hu-Maqên fault and Zhouqu-Liangdang fault, which are main tectonic boundaries of A＇nyemaqên suture zone. Wudu-Diebu fault, located at the depth variation zone of the basement, possibly has the same deep tectonic background with Zhouqu-Liangdang fault. The strongly depressed basement characterized by low velocity distribution and lateral inhomogeneity in A＇nyemaqên suture zone implies crushed zone features under pinching action.

关键词： eastern A'nyemaqên suture zone deep seismic refraction upper crust structures

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

基于FBG-FPI光纤传感器的岩石含水率光纤超声检测

引用

光学学报 2024年第8期44卷 19-26页

作者：康弯弯邵志华周旷羽乔学光西北大学物理学院陕西西安710127 陕西省油气资源光纤探测工程技术研究中心陕西西安710065

提出了一种基于光纤超声传感技术的岩石含水率检测新方法。在实验中,以压电换能器(PZT)发出的1 MHz超声波作为声源,采用超声波透射法,通过刻写在细芯光纤中的一对光纤光栅检测岩石的超声波信息(包括时域以及频域的结果),并与相同条件下... 详细信息

提出了一种基于光纤超声传感技术的岩石含水率检测新方法。在实验中,以压电换能器(PZT)发出的1 MHz超声波作为声源,采用超声波透射法,通过刻写在细芯光纤中的一对光纤光栅检测岩石的超声波信息(包括时域以及频域的结果),并与相同条件下的PZT接收结果进行比较。随着岩石含水率的增加,光纤传感器表现出与PZT相似的响应趋势,且测得的含水率绝对偏差较小,充分证明了光纤探测岩石含水信息的可行性和优越性。

关键词：光纤光学红砂岩含水率超声波光纤检测

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

Genetic algorithm in seismic waveform inversion and its application in deep seismic sounding data interpretation

引用

Acta Seismologica Sinica(English Edition) 2006年第2期19卷 163-172页

作者：王夫运张先康 geophysical exploration center China Earthquake Administration Zhengzhou 450002 China

A genetic algorithm of body waveform inversion is presented for better understanding of crustal and upper mantle structures with deep seismic sounding （DSS） waveform data. General reflection and transmission synthetic seismogram algorithm, which is capable of calculating the response of thin alternating high and low velocity layers, is applied as a solution for forward modeling, and the genetic algorithm is used to find the optimal solution of the inverse problem. Numerical tests suggest that the method has the capability of resolving low-velocity layers, thin alternating high and low velocity layers, and noise suppression. Waveform inversion using P-wave records from Zeku, Xiahe and Lintao shots in the seismic wide-angle reflection/refraction survey along northeastern Qinghai-Xizang （Tibeteau） Plateau has revealed fine structures of the bottom of the upper crust and alternating layers in the middle/lower crust and topmost upper mantle.

关键词： genetic algorithm waveform inversion numerical test deep seismic sounding fine crustal structure

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

多条人工地震测深剖面资料联合反演首都圈三维地壳结构

引用

地球物理学报 2001年第3期44卷 360-368,T001页

作者：李松林张先康宋占隆石金虎邓宏钊杨健张成科任青芳中国地震局地球物理勘探中心郑州450002

为了对多条二维剖面资料进行统一分析和解释 ,本文考虑了各剖面交点处的约束条件 ,通过建立统一的偏导矩阵 ,将各剖面资料联立求解 .利用该方法对中国地震局地球物理勘探中心在首都圈内 6条人工地震宽角反射 /折射剖面资料进行了重新处... 详细信息

为了对多条二维剖面资料进行统一分析和解释 ,本文考虑了各剖面交点处的约束条件 ,通过建立统一的偏导矩阵 ,将各剖面资料联立求解 .利用该方法对中国地震局地球物理勘探中心在首都圈内 6条人工地震宽角反射 /折射剖面资料进行了重新处理和解释 ,得到该地区的地壳三维速度结构和构造特征 .在此基础上 ,结合其他地球物理研究成果 ,确定了壳内存在的 4处低速层 (体 )

关键词：首都圈人工地震测探联合反演地壳结构孕震结构

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

Study on basement structures of the northeast Pamirs

引用

Acta Seismologica Sinica(English Edition) 2002年第4期15卷 395-401页

作者：段永红张先康杨卓欣 1. Research center of exploration Geophysics China Seismological Bureau 450002 Zhangzhou China

Basement structures and basement interfaces are obtained by finite-difference and time-term methods using Pg-wave data from two deep seismic sounding (DSS) profiles in the Artush-Jiashi strong earthquake area. The geological units differ considerably in basement depth. The basement structures of contact zones between two geological units also vary obviously, which marks the existence of boundary faults. Finally, we make a remark upon the relationship between characteristics of basement structures and seismicity in the Artush meizoseismal area and the Jiashi earthquake swarm area.

关键词： northeast Pamirs basement structure finite-difference tomography time-term method meizoseismal area

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

The complexity feature of crust-mantle boundary in Zhangbei seismic region and its tectonic implication

引用

Acta Seismologica Sinica(English Edition) 2006年第3期19卷 243-250页

作者：赖晓玲张先康孙译 geophysical exploration center China Earthquake Administration Zhengzhou 450002 China North China Institute of Water Conservancy and Hydroelectric Power Zhengzhou 450008 China

The ProP waveform data obtained from a deep seismic sounding profile, which ran through Zhangbei seismic region, were processed by means of both seismic wave complexity coefficient and frequency spectrum analysis methods, and the complexity characteristics of crest-mantle boundary beneath the studied area and its adjacent region were determined. The results show that the place below epicenter can be taken as boundary, the northern side of which is Inner Mongolia axis with small complexity coefficient and the southern side of which is Huai＇an basin with large complexity coefficient. The different spectrum patterns at the two sides of the epicenter were inferred from spectrum analysis. In the epicentral area, there have been multi-period magmatic eruptions since Meso-Cenozoic and craters exist at the surface. From the velocity imaging of middle and upper crust in Zhangbei seismic region it can be found that there are crustal low velocity bodies around the craters and also there are low velocity zones, which went into deep crust. It is suggested that the distinct zones of crust-mantle boundary complexity may be the margin, where the magma had intruded due to magma activity in Meso-Cenozoic. The southern side with large complexity coefficient is deep magmatic activity area and the northern side with small complexity coefficient is stable crust-mantle tectonics. The difference of crust-mantle complexity provides deep background for the development of strong earthquake.

关键词： Zhangbei seismic region crust-mantle boundary complexity coefficient frequency spectrum analysis 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

Study on rupture zone of the M=8.1 Kunlun Mountain earthquake using fault-zone trapped waves

引用

Acta Seismologica Sinica(English Edition) 2005年第1期18卷 43-52页

作者：李松林张先康樊计昌 Research center of exploration Geophysics China Earthquake Administration

The observation of the fault-zone trapped waves was conducted using a seismic line with dense receivers across surface rupture zone of the M=8.1 Kunlun Mountain earthquake. The fault zone trapped waves were separated from seismograms by numerical filtering and spectral analyzing. The results show that: a) Both explosion and earthquake sources can excite fault-zone trapped waves, as long as they locate in or near the fault zone; b) Most energy of the fault-zone trapped waves concentrates in the fault zone and the amplitudes strongly decay with the distance from observation point to the fault zone; c) Dominant frequencies of the fault-zone trapped waves are related to the width of the fault zone and the velocity of the media in it. The wider the fault zone or the lower the velocity is, the lower the dominant frequencies are; d) For fault zone trapped waves, there exist dispersions; e) Based on the fault zone trapped waves observed in Kunlun Mountain Pass region, the width of the rupture plane is deduced to be about 300 m and is greater than that on the surface.

关键词： fault-zone trapped waves M=8.1 Kunlun Mountain earthquake seismic rupture plane

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

2-D crustal structure of Changbaishan-Tianchi volcanic region determined by seismic traveltime inversion

引用

Acta Seismologica Sinica(English Edition) 2002年第2期15卷 152-161页

作者：王夫运张先康杨卓欣 Research center of exploration Geophysics

2-D velocity structure and tectonics of the crust and upper mantle is revealed by inversion of seismic refraction and wide-angle reflection traveltimes acquired along the profile L1 in the Changbaishan-Tianchi volcanic region. It is used in this study that seismic traveltime inversion for simultaneous determination of 2-D velocity and interface structure of the crust and upper mantle. The result shows that, under Changbaishan-Tianchi crater, there exists a low-velocity body in the shape of an inverted triangle, and the crustal reflecting boundaries and Moho all become lower by a varying margin of 2-6 km, forming a crustal root which is assumed to be the Changbaishan-Tianchi volcanic system. Finally, we make a comparison between our 2-D velocity model and the result from the studies by using trial-and-error forward modeling with SEIS83.

关键词： seismic traveltime inversion 2-D velocity structure Changbaishan-Tianchi volcanic system

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

2-D crustal Poisson′s ratio from seismic travel time inversion in Changbaishan Tianchi volcanic region

引用

Acta Seismologica Sinica(English Edition) 2005年第3期18卷 345-353页

作者：刘志张先康王夫运段永红赖晓玲 geophysical exploration center China Earthquake Administration Zhengzhou 450002 China

Based on the inversion method of 2D velocity structure and interface, the crustal velocity structures of P-wave and S-wave along the profile L1 are determined simultaneously with deep seismic sounding data in Changbaishan Tianchi volcanic region, and then its Poisson's ratio is obtained. Calculated results show that this technique overcomes some defects of traditional forward calculation method, and it is also very effective to determine Poisson's ratio distribution of deep seismic sounding profile, especially useful for study on volcanic magma and crustal fault zone. Study result indicates that there is an abnormally high Poisson's ratio body that is about 30 km wide and 12 km high in the low velocity region under Tianchi crater. Its value of Poisson's ratio is 8% higher than that of surrounding medium and it should be the magma chamber formed from melted rock with high temperature. There is a high Poisson's ratio zone ranging from magma chamber to the top of crust, which may be the uprise passage of hot substance. The lower part with high Poisson's ratio, which stretches downward to Moho, is possibly the extrusion way of hot substance from the uppermost mantle. The conclusions above are consistent with the study results of both tomographic determination of 3D crustal structure and magnetotelluric survey in this region.

关键词： seismic travel time inversion S-wave, Changbaishan Tianchi volcano magma chamber

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

资源依赖理论下国家实验室与大学联合培养研究生的实践经验与启示

引用

实验室研究与探索 2024年第3期43卷 128-134页

作者：周红坊陆维康林成华浙江大学公共管理学院杭州310058 浙江大学中国科教战略研究院杭州310058

国家实验室与大学如何联合培养研究生?以资源依赖理论为基础,通过跨案例对比与理论抽样,研究提炼并归纳8所世界著名国家实验室与大学联合培养研究生的实践经验。在成果和行为相互依赖的关系之下,国家实验室和大学联合培养研究生呈现出4... 详细信息

国家实验室与大学如何联合培养研究生?以资源依赖理论为基础,通过跨案例对比与理论抽样,研究提炼并归纳8所世界著名国家实验室与大学联合培养研究生的实践经验。在成果和行为相互依赖的关系之下,国家实验室和大学联合培养研究生呈现出4个特征即科学研究与国家需求—联合培养的需求性;职业取向与代理取向—联合培养的目的性;项目制与独立教育中心—联合培养的承载平台以及大学主导型人才培养—联合培养的主路径。研究提出以研促教,构建科教共生型关系;明确目标,打造学科交叉育人框架;贯通育人体系,搭建教育联络中心;以评促育,完善以学生为中心的评价体系共4点建议,以为国家实验室管理人员开展研究生培养工作和教育部门领导者政策制定提供参考。

关键词：国家实验室研究生资源依赖联合培养

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：