检索结果-南通市图书馆

Crustal velocity structures beneath North China revealed by ambient noise tomography

在线全文

学校读者我要写书评

暂无评论

Earthquake Science 2010年第5期23卷 477-486页

作者： Lihua Fang Jianping Wu Zhifeng Ding weilai wang Giuliano Francesco Panza Institute of Geophysics China Earthquake Administration Beijing 100081 China Department of Earth Sciences University of Trieste Trieste 34127 Italy The Abdus Salam International Center for Theoretical Physics Earth System Physics Section Trieste 34151 Italy

We collected continuous noise waveform data from January 2007 to February 2008 recorded by 190 broadband and 10 very broadband stations of the North China Seismic Array. The study region is divided into grid with interval 0.25°×0.25°, and group velocity distribution maps between 4 s and 30 s are obtained using ambient noise tomography method. The lateral resolution is estimated to be 20-50 km for most of the study area. We construct a 3-D S wave velocity model by inverting the pure path dispersion curve at each grid using a genetic algorithm with smoothing constraint. The crustal structure observed in the model includes sedimentary basins such as North China basin, Yanqing-Huailai basin and Datong basin. A well-defined low velocity zone is observed in the Beijing-Tianjin-Tangshan region in 22-30 km depth range, which may be related to the upwelling of hot mantle material. The high velocity zone near Datong, Shuozhou and Qingshuihe within the depth range of 1-23 km reveals stable characteristics of Ordos block. The Taihangshan front fault extends to 12 km depth at least.

关键词： seismic noise surface wave tomography velocity structure genetic algorithm North China

Influencing Factors of Reheating Shrinkage Rate of Glass Substrate on LTPS Process

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2020年第4期35卷 682-685页

作者： wang weilai TIAN Yingliang wang Wei LIU Yaru SUN Shibing LüFeng CHEN Xinxin Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China National Engineering Laboratoryfor Technology and Equipment on Flat Panel Display Glass Shijiazhuang 050000China

Different heating treatments with the variation of heating rates,holding temperatures and holding time were used to simulate the LTPS *** experimental results show that the reheating shrinkage rates of glass substrates are rarely changed with increasing the heating rate,but strongly enhanced by raising the holding temperature and time,which shows that the reheating shrinkage of glass is closely related to heat treatment and structural *** production process of glass is critical to the reheating shrinkage of glass.

关键词： low temperature ploy-silicon(LTPS) glass substrates reheating shrinkage rate structural relaxation

Relocation of the 2012 M_s6.6 Xinjiang Xinyuan earthquake sequence

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2014年第12期57卷 216-220页

作者： FANG LiHua WU JianPing wang ChangZai wang weilai YANG Ting Institute of Geophysics China Earthquake Administration

At 05：07 AM on June 30, 2012 （Beijing time）, an Ms6.6 earthquake （hereafter referred to as Xinyuan earthquake） occurred at the junction of Xinyuan County, Ili Kazak Au tonomous Prefecture and Hejing County, Bayin... 详细信息

关键词：新疆维吾尔族地震序列定位北京时间新源县和静县哈萨克交界处

同方期刊数据库

Relocation of the mainshock and aftershock sequences of M_S7.0 Sichuan Lushan earthquake

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2013年第20期58卷 3451-3459页

作者： FANG LiHua WU JianPing wang weilai Lü ZuoYong wang ChangZai YANG Ting CAI Yan Institute of Geophysics China Earthquake Administration Guangdong Earthquake Administration

The mainshock of April 20,2013 Sichuan Lushan MS7.0 earthquake was relocated using a 3-D velocity *** difference algorithm was applied to relocate aftershock sequences of Lushan *** locations of 2405 aftershocks were *** location errors in E-W,N-S and U-D direction were 0.30,0.29 and 0.59 km on average,*** location of the mainshock is 102.983°E,30.291°N and the focal depth is 17.6 *** relocation results show that the aftershocks spread approximately 35 km in length and 16 km in *** dominant distribution of the focal depth ranges from 10 to 20 km.A few earthquakes occurred in the shallow *** depth profiles show fault planes dip to the northwest,manifested itself as a listric thrust *** dip angle is steep in the shallow crust and gentle in the deep *** the epicenters of aftershocks distributed mainly along both sides of the Shuangshi-Dachuan fault,the seismogenic fault may be a blind thrust fault on the eastern side of the Shuangshi-Dachuan *** relocation results reveal that there is a southeastward tilt aftershock belt intersecting with the seismogenic fault with *** speculate it is a back thrust fault that often appears in a thrust fault *** earthquake triggered the seismic activity of the back thrust fault.

关键词：余震序列地震发生庐山主震四川逆冲断层系统显示故障震源深度

同方期刊数据库

An accessible seismological dataset of 2021 Yangbi M_(S)6.4 earthquake

在线全文

学校读者我要写书评

暂无评论

Earthquake Science 2021年第5期34卷 460-464页

作者： Shuguang wang Hui Yang weilai wang Fang wang Zheng Liu Wei Yang Weitao wang Yunpeng Zhang Lu Li Jiupeng Hu Xiaobin Li Wenjian Cha Beng Ye Hongbo Zhu Jun Yang Earthquake Science Data Center Institute of GeophysicsChina Earthquake AdministrationBeijing 100081China Leading Edge Geophysics Department Institute of GeophysicsChina Earthquake AdministrationBeijing 100081China Yunnan Earthquake Agency Kunming 650224China

A M_(S)6.4 earthquake occurred on 21 May 2021 in Yangbi county,Dali prefecture,Yunnan,China,at 21:48 Beijing Time(13:48 UTC).Earthquakes with an M3.0 or higher occurred before and after the main *** data analysis is essential for the in-depth investigation of the 2021 Yangbi M_(S)6.4 earthquake sequence and the seismotectonics of northwestern *** of Geophysics,China Earthquake Administration(CEA),has compiled a dataset of seismological observations from 157 broadband stations located within 500 km of the epicenter,and has made this dataset available to the earthquake science research *** dataset(total file size:329 GB)consists of event waveforms with a sampling frequency of 100 sps collected from 18 to 28 May 2021,20-Hz and 100-Hz continuous waveforms collected from 12 to 31 May 2021,and seismic instrument response *** promote data sharing,the dataset also includes the seismic event waveforms from 20 to 22 May 2021 recorded at 50 stations of the ongoing Binchuan Active Source Geophysical Observation Project,for which the data protection period has not *** waveforms of the main shock are included in the appendix of this article and can be downloaded from the Earthquake Science *** event and continuous waveforms are available from the Earthquake Science Data Center website(***)on application.

关键词： Yangbi earthquake seismological dataset geophys-ical observation data share

在线全文

学校读者我要写书评

暂无评论

郯庐断裂带中南段地壳厚度与泊松比研究

地球物理学报 2023年第3期66卷 1036-1049页

作者：陈立艺王未来蔡光耀中国地震局地球物理研究所北京100081

郯庐断裂带中南段与西太平洋板块俯冲以及华北克拉通破坏密切相关,研究其深部结构对于了解郯庐断裂带构造演化过程、强震的孕震机制具有重要意义.本文利用密集台阵波形资料,采用接收函数H-κ叠加方法获得郯庐断裂带中南段的地壳厚度和... 详细信息

郯庐断裂带中南段与西太平洋板块俯冲以及华北克拉通破坏密切相关,研究其深部结构对于了解郯庐断裂带构造演化过程、强震的孕震机制具有重要意义.本文利用密集台阵波形资料,采用接收函数H-κ叠加方法获得郯庐断裂带中南段的地壳厚度和泊松比.结果显示,郯庐断裂带中南段的地壳厚度分布以庐江和新沂为分段点呈现出与地质构造相关的南北向分段特征:南段的断裂带西侧的地壳厚度比东侧厚约5 km,中段的断裂带两侧厚度差异减小至约3 km,而北段则表现为断裂带下方隆起特征.郯庐断裂带沿线的地壳泊松比较高,推测是地幔物质的热侵蚀和化学侵蚀所致.根据艾里地壳均衡理论,南段地壳厚度与地表高程相关,基本符合艾里地壳均衡模型;而中段两侧地表高程基本相同,两侧地壳厚度差异表明不符合艾里地壳均衡模型,可能与断裂带西侧的华北克拉通岩石圈比东侧扬子克拉通岩石圈具有更高密度有关,高密度岩石圈产生向下“拖拽力”导致莫霍面相对理论值偏深;北段的莫霍面也偏深,与中段断裂带西侧情况类似,该区域基本位于华北克拉通块体.在郯城地震破裂范围内,存在莫霍面的不平滑过渡、活动块体的边界带以及断裂的分叉与交汇这三类结构特征.在上述结构特征的区域应力更集中,从而孕育产生了1668年郯城8.5级地震.

关键词：郯庐断裂带中南段 H-κ叠加地壳厚度泊松比郯城8.5级地震

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

鄂尔多斯及邻区基于程函方程的面波层析成像

地球物理学报 2021年第4期64卷 1215-1226页

作者：蔡光耀王未来吴建平房立华中国地震局地球物理研究所北京100081 中国地震局地震观测与地球物理成像重点实验室北京100081

利用鄂尔多斯及邻区的固定台站和流动台站记录到的面波资料,使用基于程函方程的面波层析成像的新方法,得到了鄂尔多斯及邻区12~150 s周期的瑞利波相速度的分布图.短周期的相速度很好的揭示出鄂尔多斯及邻区的山脉隆起和拉张盆地等引起... 详细信息

利用鄂尔多斯及邻区的固定台站和流动台站记录到的面波资料,使用基于程函方程的面波层析成像的新方法,得到了鄂尔多斯及邻区12~150 s周期的瑞利波相速度的分布图.短周期的相速度很好的揭示出鄂尔多斯及邻区的山脉隆起和拉张盆地等引起的高低速异常的分布特征.中等周期的相速度显示鄂尔多斯盆地内部为显著的高速异常,而它的四周逐渐地被低速异常所包围.大同火山区的低速异常在垂向上进行不断的延伸和扩展,推测是由于其下方的岩浆上涌引起地壳和上地幔顶部升温造成的.长周期的相速度显示鄂尔多斯盆地下方在岩石圈深度范围内,以北纬38°为界南北部岩石圈的差异比较明显,呈现南部厚北部薄的特点.研究发现研究区从西到东岩石圈逐渐减薄,这可能是由于受到太平洋板块俯冲引起的地幔热物质上涌和运移的影响.

关键词：鄂尔多斯地区面波层析成像程函方程瑞利波相速度

在线全文

学校读者我要写书评

暂无评论

华北克拉通地区基于程函方程的面波层析成像

地球物理学报 2024年第2期67卷 503-519页

作者：包晶晶王未来蔡光耀刘慧杰中国地震局地球物理研究所北京100081

利用布设在华北克拉通地区的流动和固定地震台站记录到的地震波数据,使用基于程函方程的面波成像方法获得了整个华北克拉通地区瑞利波15~150 s周期的相速度,并反演了研究区S波速度结构.中长周期相速度结果显示,在上地幔及岩石圈深度范围... 详细信息

利用布设在华北克拉通地区的流动和固定地震台站记录到的地震波数据,使用基于程函方程的面波成像方法获得了整个华北克拉通地区瑞利波15~150 s周期的相速度,并反演了研究区S波速度结构.中长周期相速度结果显示,在上地幔及岩石圈深度范围内,燕山地区表现为高速特征,华北克拉通中部大同盆地及其以南地区、太行山等区域的低速体与华北盆地的低速体相连,呈现大面积的低速异常,低速体的速度值比青藏高原东北缘的速度值更低;S波速度显示鄂尔多斯岩石圈厚度较厚,克拉通中部和华北盆地岩石圈厚度相差不大,燕山地区岩石圈厚度要厚于华北盆地.本文认为华北克拉通岩石圈破坏存在分区性,克拉通中部和燕山地区均存在一定的克拉通破坏,但破坏程度不同,鄂尔多斯地块北部存在局部克拉通改造,但克拉通稳定性特征依然存在;破坏的主要动力学来源更可能是太平洋板块的西向俯冲.研究发现克拉通中部和东部的强震分布区与克拉通破坏区域重合,大部分强震发生在岩石圈强度边界上,分析认为岩石圈强度的差异是岩石圈强度边界上显示出较高的强震活动性的原因.

关键词：华北克拉通程函方程面波成像瑞利波相速度强震活动性

利用地脉动信息约束沉积层区域台站下方速度结构反演

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

地震学报 2011年第1期33卷 28-38,122页

作者：王未来吴建平房立华中国地震局地球物理研究所中国北京100081

利用接收函数和地震面波频散联合反演台站下方速度结构,已成为一种常用技术.联合反演结果能同时匹配两个不同数据集合,使得解的非唯一性在一定程度上得到了有效抑制.然而对于现有地震台站分布,短周期面波由于受多种因素的影响,可以获得... 详细信息

利用接收函数和地震面波频散联合反演台站下方速度结构,已成为一种常用技术.联合反演结果能同时匹配两个不同数据集合,使得解的非唯一性在一定程度上得到了有效抑制.然而对于现有地震台站分布,短周期面波由于受多种因素的影响,可以获得的有效频散资料较少,层析成像的横向分辨率较低,难以反映台站附近局部介质真实的频散特性,而且这些面波频散与接收函数在不同深度上反映的空间范围也存在一定的差异,在横向构造变化复杂的沉积层地区,二者往往很难同时得到较好的拟合.因此联合反演应尽可能采用反映相同空间上介质信息的约束资料.2009年5月,我们分别在冀北高原和华北平原沉积层区域的两个流动地震台站附近,布设了小孔径台阵进行地脉动观测.采用空间自相关方法获得高频相速度频散曲线,并作为浅部速度结构约束条件运用于沉积层区域接收函数与面波的联合反演.结果表明,高频相速度频散曲线的约束有可能明显提高沉积层地区速度结构反演的稳定性和可靠性.

关键词：联合反演地脉动接收函数速度结构