长江三峡库区地震地形变监测研究   总被引：8，自引：4，他引：4  

杜瑞林  邢灿飞  伍中华  李胜乐  乔学军  游新兆  王琪  孙少安  申重阳  凌模 《大地测量与地球动力学》2004,24(2):23-29

三峡地壳形变监测网络结合空间大地测量(GPS、InSAR)和传统大地测量的优点，在1998年以来的三峡工程建设期间和2003年水库首次蓄水中获取了大量监测成果。结果显示库区地壳运动的基本图像：垂直形变较为显著，主要来自因蓄水荷载而产生的形变，水平形变不明显．库区主要断层的活动性在蓄水期间有明显加强迹象。水准测量反映从1998年首期观测至2003年10月首次蓄水后的库区垂直位移．沉降范围较大；GPS给出了2003年蓄水前后库区的垂直位移，形变的范围主要集中在水库近岸区域。水准测量与GPS观测反应的垂直位移的量级基本一致，沉降的最大幅度在3～4cm左右。水准监测、GPS观测与重力监测结果有一定的对应性。从地壳形变监测与研究结果分析，近期负荷改变而诱发中强地震的可能性不大。  相似文献   

Study on Variation of Fitting Goodness of Relation Between Earthquake Frequency and Magnitude before Moderately Strong Earthquakes (Ms≥5.0)     

Li Zhixiong  Zhang Guomin  Fu Zhengxiang  and Zhang YongxianState Seismological Bureau  Beijing  China Center for Analysis  Prediction  SSB  Beijing  China 《中国地震研究》1996,(4)

In this paper,characteristics of spatial and temporal variation of linear fitting goodness before some moderately strong earthquakes(Ms≥5.0)in the eastern part of China(east of longitude 180)are studied according to the famous Gutenberg-Richter's relation expressed as lgN=a-bM,by using the moderate and small events that occurred in and around the source area.The results show that the linear goodness of fitting varies abnormally prior to these moderately strong earthquakes.In the early stage of the earthquake preparatory process,distribution of the energy released through small events in and around the source area is isostatic and the fitting goodness approximates 1,while the distribution of the energy turns to be isostatic before moderately strong earthquakes,leading to the obvious decrease of the linear goodness of fitting.This phenomenon could be a medium term anomaly and a medium term criterion for moderately strong earthquake prediction.  相似文献   

香山绝对点周围的局部地壳变形及其对重力测量结果的影响   总被引：1，自引：0，他引：1  

刘少明  高荣胜  贾民育 《大地测量与地球动力学》2002,22(2):97-100

为了监视北京地区的地壳稳定性，北京测绘院对10多个基岩点和北京市区进行了多次沉降观测，结果表明香山点近10多年来高程变化只有几毫米，其重力效应可略而不计，但测点东北和东南方有两个较大的下沉区。用线积分法计算了两个局部沉降的重力效应，在沉降区中心其影响可达0.38μms^-2，但对香山点的重力效应非常小，完全可以忽略。因此得出如下结论：香山点观测到的重力变化不是地壳变形引起的。  相似文献   

The Hybrid Nature of 0846＋51W1： a BL Lac Object with a Narrow Line Seyfert 1 Nucleus     

Hong-Yan Zhou  Ting-Gui Wang  Xiao-Bo Dong  Cheng Li  Xue-Guang ZhangCenter for Astrophysics  University of Science  Technology of China  Hefei   《中国天文和天体物理学报》2005,5(1):41-48

We found a NLS1 nucleus in the extensively studied eruptive BL Lac object, 0846+51W1, out of a large sample of NLS1s compiled from the spectroscopic dataset of SDSS DR1. Its optical spectrum can be well decomposed into three components: a power law component from the relativistic jet, a stellar component from the host galaxy, and a component from a typical NLS1 nucleus. The emission line properties of 0846+51W1, FWHM  相似文献   

Optical observations of the broad-lined type Ic supernova SN 2012ap     

Zheng Liu  Xu-Lin Zhao  Fang Huang  Xiao-Feng Wang  Tian-Meng Zhang  Jun-Cheng Chen  Tong-Jie Zhang 《天文和天体物理学研究(英文版)》2015,(2):225-236

The optical observations of the type Ic supernova(SN Ic) SN 2012 ap in NGC 1729 are presented. A comparison with other SNe Ic indicates that SN 2012 ap is highly reddened(with E(B- V)host～0.8 mag) and may represent one of the most luminous SNe Ic ever observed, with an absolute V-band peak magnitude of ～-19.3±0.5 mag after extinction correction. The near-maximum-light spectrum shows wide spectral features that are typical of broad-lined SNe Ic. One interesting feature in the spectrum is the appearance of some narrow absorption features that can be attributed to the diffuse interstellar bands, consistent with the large reddening inferred from the photometric method. Based on the light curves and the spectral data, we estimate that SN 2012 ap produced a56 Ni mass of ～ 0.3 ± 0.1M in the explosion, with an ejecta mass of 2.4+0.7-0.7M and a kinetic energy of E5K= 1.1+0.4-0.4× 102 erg. The properties of its progenitor are also briefly discussed.  相似文献   

青藏块体及周缘潜在震源与强震关系研究   总被引：7，自引：3，他引：4  

张希  江在森  王双绪  王琪 《大地测量与地球动力学》2003,23(1):35-41

利用1993－1999、1999－2001年青藏块体东北以及1991－2000年中国大陆GPS水平运动年速率资料，基于单一力源模型，反演获得了青藏块体及其周缘地区2000－2001年10次地震的震前资料反映的潜在震源参数，所得力源中心位置距实际震中的距离相对较小，其中2000年景泰5．9、2001年宁蒗5．8、昆仑8．1及格尔木3次5．7、5．8级地震均在50km左右；2000年兴海6．6、2001年年施甸5．9、永胜6．0级地震不到100km；2001年雅江6．0级地震最远（121km）。此外，1999－2001年青藏块体东北缘地区的反演结果表明，沿东昆仑构造带的昆仑山口－达日及库玛断裂向东至甘东南、甘青交界区域，可能仍存在潜在震源。  相似文献   

THREE-WAY METHODS FOR THE CALIBRATION OF CHROMATOGRAPHIC SYSTEMS:COMPARING PARAFAC AND THREE-WAY PLS     

AGEK.SMILDE  DURKA.DOORNBOS 《地理学报(英文版)》1991,(4)

For the calibration of chromatographic systems,different methods can be used.One class of methodsutilizes three-way approaches.The calibration problem is stated in such a way that the decompositionof a three-way array can serve for the prediction of retention on new stationary phases.Two three-way approaches are presented:the Unfold-PCA and PARAFAC models.The theory ofboth methods is presented and the differences are highlighted,the main difference being that PARAFACis a trilinear decomposition whereas Unfold-PCA is not.Both three-way methods are evaluated on asmall data set consisting of retention measurements of eight solutes at six mobile phase compositions onsix stationary phases.The differences in performance of the two models are minor,For calibration purposes,two variants of the methods are discussed:three-way PLS and an extensionof PARAFAC.Again the theory and differences between the two methods are explained.The predictiveperformance of the two methods is compared using the same data set as earlier.The differences inpredictive performance,however,are minor.Both methods are capable of predicting 98% of thevariation in the test sets.Yet,there are other considerations when comparing methods than predictiveperformance,e.g.the quality of the predictions.  相似文献   

月际地震趋势的数值预测法   总被引：3，自引：0，他引：3       下载免费PDF全文

黎令仪  刘德富  康春丽  韩延本 《地震学报》2004,26(5):529-532

考虑到目前地震月趋势以模糊用语进行预测的缺陷,本文提出采用数值预测法能更好地适应社会需求. 这种方法是基于地震有自律现象,通过建立非线性的数学模型予以实现的. 模型试验结果表明,我国大陆地震活动存在有7~8个月左右的循环结构,逐月比较预测与实况的震级误差平均低于0.2级,因而该方法比经验性预报更适宜社会的实际利用.   相似文献   

REE Characteristics of the Kalatongke Cu-Ni Deposit, Xinjiang, China   总被引：6，自引：0，他引：6  

WANG Yuwang  WANG Jingbin  WANG Lijuan  WANG Yong  TU Caineng Beijing Institute of Geology for Mineral Resources  Beijing  Key Laboratory of Mineral Resources Research  Institute of Geology  Geophysics  Chinese Academy of Sciences  Beijing  Xinjiang Kalatongke Cu-Ni Mine  Fuyun  Xinjiang 《《地质学报》英文版》2004,78(2):396-403

On the basis of the study on the REE geochemistry of the ore minerals and host rocks of the Kalatongke Cu-Ni deposit, Xinjiang, it is indicated that the major ore minerals, sulfides, were sourced from the host mafic-ultramafic magma. Characterized by low REE content of sulfide, such a Cu-Ni sulfide deposit occurring in the orogen is obviously different from that on the margin of the craton. Because the mafic-ultramafic rocks from the Cu-Ni sulfide deposit occurring in the orogen is water-rich and the REEs of some sulfides show a particular "multiple-bending" pattern, which suggests coexistence of multiple liquid phases (fluid and melt), the sulfide melt possibly contains a great deal of hydrothermal fluids and increasingly developed gases and liquid-rich ore-forming fluids after the main metallogenic epoch (magmatic segregation stage).  相似文献   

El Nio事件发生对南北半球大气环流异常的对称及非对称性影响及其机理分析     

黄平  黄荣辉 《大气科学》2009,(1)

利用合成分析方法,分析了1971~2003年间7个El Nio事件发生时南、北半球大气环流异常的对称与反对称特性。分析结果表明,El Nio事件发生期间,在热带地区15°S~15°N大气环流异常以对称性为主,但也有一定的反对称分量:高度场异常和纬向风异常的对称性较强,而经向风异常的反对称较强;同时在El Nio事件演变的各阶段,高度场异常和纬向风异常的变化较明显,而经向风的变化较小,高度场和风场异常在低层(700hPa)和高层(200 hPa)呈明显的反位相分布。并且,为探讨El Nio事件对南、北半球大气环流异常的非对称性影响的机理,本研究进一步利用ERA-40逐日资料,应用Hough函数分析了El Nio事件发生期间这些赤道波动的演变特征。结果表明,El Nio事件发生期间,热带地区大气环流异常对称性较强的主要原因是对称性Rossby波异常较强,而Rossby重力混合波异常对经向风场的反对称分量有重要作用;并且,研究结果还表明,在ElNio事件发生期间,热带东太平洋的海温正异常能够激发由对称性Rossby波和Kelvin波组成的Gill型环流异常。此外,分析表明Hough函数在分析热带大气波...  相似文献