Major Earthquakes in and Around Yunnan Province and Variations of Astronomical Time-Latitude Residuals Determined by Yunnan Observatory     

Kan Rongju  Hu HuiSeismological Bureau of Yunnan Province  Kunming  ChinaYunnan Astronomical Observatory  Academia Sinica  Kunming  China 《中国地震研究》1996,(3)

In this paper,the features of medium-term anomalies for strong earthquakes and the criteria for the prediction of such earthquakes are discussed,as well as the feasibility of applying the anomalies of astronomical time-latitude residuals to earthquake prediction and their limitation when applied to imminent-term prediction.The criteria used to identify the anomalies of time-latitude residuals for M≥6.0 earthquakes in Yunnan Province and for M≥7.0 earthquakes around Yunnan are also discussed.The last strong earthquake in the data used for testing passed the whole process of earthquake prediction practice.In addition,some special features of the case in which anomalies appeared but no strong earthquake followed are also discussed.  相似文献   

导线网可靠性分析和粗差探查     

黄加纳  吴俊昶 《武汉大学学报(信息科学版)》1997,(1)

采用相关平差算法计算导线网中每个观测值的多余观测分量和各类观测值的内可靠性指标，按统计假设检验理论构成观测值的粗差检测统计量，经过探查指出可能含有粗差的观测值。最后给出内可靠性分析的结果，并提出导线网设计和施测要点建议  相似文献   

中国的特种精密工程测量   总被引：2，自引：1，他引：2  

吴翼麟 《测绘工程》1997,6(2):1-7

介绍大坝变形观测、波带板激光准直系统等特种精密工程测量方法，在工程与工业建设、大型建构筑物变形观测及抗灾减灾等方面取得的成就和效益；阐述特种精密工程测量的成长道路，以及当前特种精密工程测量的热门话题与发展趋势。  相似文献   

热带湿润气候中的局地天气预报          下载免费PDF全文

Chineke Theo Chidiezie 《大气科学》1997,21(5):638-640

本文目的在于描述热带湿润气候中局地天气预报的各种方法。文中所给的结果在大多数情况下是可靠的。  相似文献   

太原盆地震群的几个特征     

侯廷爱  程新原 《山西地震》1997,(3):12-17

在分析１９６６年—１９８５年间太原盆地发生的１４起震群序列资料的基础上。叙述了这些震群分布区的新构造特征、空间分布特征、震群活动区特征、震群迁移特征、震群的震源深度、震群所反映的现代局部应力场等。  相似文献   

试析华清温泉水化观测中的干扰     

申茂山 《山西地震》1997,(3):46-50

对华清温泉在水化观测中的干扰因素及特征，进行了分析探讨。通过对观测资料、水文地质结构的分析，指出降水、排污、供水开采等因素，对泉点没有影响。得出只有本身不抽水时，井内形成的“滞留水”，对观测结果影响较大及Ｈｅ、Ｒｎ含量明显降低，Ｏ２含量增高，Ｎ２变化不大，ＣＯ２含量亦降低的结论。指出供电不足是形成滞留水的主要原因。  相似文献   

近地大气物理现象与光电测距精度的关系     

彭树森 《内陆地震》1989,3(3):240-251

本文根据大气温度层结状态,讨论两种光电测距最佳观测时刻的理论。指出,在不稳定湍流状态下,更有利于获得高精度的观测值。  相似文献   

Wind fluctuations near a cold vortex-tropopause funnel system observed by the MU radar     

Shoichiro Fukao  Manabu D. Yamanaka  Hiromasa Matsumoto  Toru Sato  Toshitaka Tsuda  Susumu Kato 《Pure and Applied Geophysics》1989,130(2-3):463-479

Vertical and temporal variations of three-dimensional wind velocity associated with an upper-tropospheric cold vortex-tropopause funnel system were observed by an MST radar in Japan (the MU radar). Marked changes of vertical velocity and horizontal wind direction were found between the inside and outside of the cold vortex. The vertical velocity activity outside the vortex was asymmetric; it was most active in a sector before the vortex. Unsaturated internal gravity waves in their generation stage contribute predominantly to the vertical velocity activity, suggesting that tropospheric occluded cyclones may be a possible source of middle-atmospheric gravity waves through the geostrophic adjustment process.  相似文献   

Internal gravity wave selection in the upper troposphere and lower stratosphere observed by the MU radar: Preliminary results     

Manabu D. Yamanaka  Shoichiro Fukao  Hiromasa Matsumoto  Toru Sato  Toshitaka Tsuda  Susumu Kato 《Pure and Applied Geophysics》1989,130(2-3):481-495

Marked wavelike variations of the lower stratospheric wind observed on 7–10 May, 1985 by an MST radar in Japan (by the MU radar) are analyzed assuming that they are induced by monochromatic internal inertio-gravity waves. These variations are mainly composed of two modes (periods: 22 and 24 hours), both of which have zonal phase velocities (C _X ) slower than the mean westerly wind (). A statistical analysis of the zonal phase velocity shows thatC _X above andC _X below the tropopause jet stream, which is considered to be a vivid proof of wave selection due to the tropospheric mean flow and upward wave emission from the tropopause jet. A comparison between the MU radar results and routine meteorological observations leads to the conclusion that the marked waves appear when the jet stream takes a maximum wind speed.  相似文献   

高频多普勒台阵中的若干技术问题   总被引：2，自引：0，他引：2       下载免费PDF全文

李利斌  吴振华  宁百齐  李钧 《地球物理学报》1987,30(6):560-565

为了研究电离层动力学特性,1985年9月在武汉建成了一个由三个台站组成的高频多普勒台阵和卫星信标法拉第台阵。文中介绍了这个台阵的布局和多普勒接收系统中的一些技术细节。这些技术措施保证了在多普勒图中清晰地显示多径现象和有效地消除小不均匀体的影响。最后还简单地介绍了这个台阵一年来的实测情况。  相似文献