布尔莎模型在GPS时间序列融合中的应用     

王紫燕  林树  武艳强  占伟  丁晓光 《中国地震》2013,29(1):68-74

利用“中国地壳运动观测网络”基准网与全球IGS站的公共站点,采用布尔莎模型求取坐标转换7参数,将地壳观测网络工程基准站点位时间序列与全球解进行绑定.结果显示,转换得到的时间序列N、E向中误差约为2、3mm,与直接融合得到的时间序列的单天误差水平相当,转换得到的站间大地线误差大部分在6mm内,表明该转换方法是可行的.  相似文献   

宽频带地震计反馈模型分析及应用实例     

薛兵  林湛  张妍  朱小毅  杨桂存 《地震地磁观测与研究》2013,34(1)

根据宽频带地震计的反馈模型推导传递函数,简化为一个近似表达式,由此可以清楚看到地震计的机械电子参数是如何影响其幅度响应特性的.在EDAS-BS60一体化数字地震仪设计中,应用近似表达式来指导反馈系统参数的计算和反馈系统调试,可将EDAS-BS60内嵌反馈地震计的频率特性调整到与理论推导的传递函数相一致.  相似文献   

Algorithm for generating dem based on cone     

Jiang Hongfei  Zhan Zhenyan 《地球空间信息科学学报》2013,16(3):30-33

Digital elevation model (DEM) has a variety of applications in GIS and CAD. It is the basic model for generating three-dimensional terrain feature. Generally speaking, there are two methods for building DEM. One is based upon the digital terrain model of discrete points, and is characterized by fast speed and low precision. The other is based upon triangular digital terrain model, and slow speed and high precision are the features of the method. Combining the advantages of the two methods, an algorithm for generating DEM with discrete points is presented in this paper. When interpolating elevation, this method can create a triangle which includes interpolating point and the elevation of the interpolating point can be obtained from the traingle. The method has the advantage of fast speed, high precision and less memory.  相似文献   

IPCC AR6解读：全球和区域海平面变化的监测和预估     

张通  俞永强  效存德  华莉娟  闫展 《气候变化研究进展》2022,18(1):12-18

IPCC第六次评估报告第一工作组报告第九章综合评估了与海平面相关的最新监测和数值模拟结果,指出目前（2006—2018年）的海平面上升速率处于加速状态（3.7 mm/a),并会在未来持续上升,且呈现不可逆的趋势。其中低排放情景（SSP1-1.9）和高排放情景（SSP5-8.5）下,到2050年,预估全球平均海平面（GMSL）分别上升0.15~0.23 m和0.20~0.30 m;到2100年,预估GMSL分别上升0.28~0.55 m和0.63~1.02 m。南极冰盖不稳定性是影响未来海平面上升预估的最大不确定性来源之一。区域海平面变化是影响沿海极端静水位的重要因素。  相似文献   

1668年郯城8 1/2 级地震构造应力场分析          下载免费PDF全文

鞠林雪  朱光  王浩乾  詹润  林少泽  严乐佳 《地质科学》2012,(3):836-850

1668年郯城8 1/2 级地震,发震断层南起郯城窑上北到莒县土岭,全长为130 km,由5条北北东走向的活断层段组成。郯城地震断层南段沿沂沭断裂带内的F₂断裂分布,倾向南东东,倾角为30°～60°。北段紧邻F₁断裂分布,倾向不稳定,倾角较陡(多为70°以上)。南段表现为右行逆冲或逆右行的运动性质,北段则以右行走滑为主。郯城地震断层南、北两段均发育断层泥带、断层角砾带和碎裂带,南段总宽度为几米到十几米,北段总宽度为几十米到近百米,局部发育多条断层泥带。郯城地震断层的排列方式及其几何学特征表明:为老断层复活,而非新生断层。通过断层擦痕的反演同震应力场显示:北段为北东东-南西西向挤压应力场,南段为北东-南西向的挤压应力场,该地震是发生在区域性挤压应力场状态下。这种应力场空间变化可能是地震断层几何学空间变化导致的。其同震应力场与该地区现代区域应力场是一致的,这说明郯城地震并未造成震后应力场调整或震后应力场调整时间较短,未影响到现今应力场。  相似文献   

The Relationship Between June Precipitation over Mid-Lower Reaches of the Yangtze River Basin and Spring Soil Moisture over the East Asian Monsoon Region   总被引：1，自引：0，他引：1       下载免费PDF全文

ZHAN Yanling  LIN Zhaohui 《Acta Meteorologica Sinica》2011,25(3):355-363

Using the US Climate Prediction Center(CPC)soil moisture dataset and the observed precipitation over China together with the NCEP/NCAR reanalysis wind and air temperature,the relationship between June precipitation over mid-lower reaches of the Yangtze River basin(MLR-YRB)and spring soil moisture over the East Asian monsoon region was explored,with the signal of the ENSO effect on precipitation removed.A significant positive correlation was found between the mean June precipitation and the preceding soilmoisture over the MRL-YRB.The possible response mechanism for this relationship was also investigated.It is found that when the soil over the MRL-YRB is wetter(drier) than normal in April and May,theair temperature in the lower troposphere over this region in May is lower(higher) than normal,and this temperature effect leads to a decrease(increase) in the temperature contrast between the land and the sea.Generally,a decrease(increase) in the land-sea temperature contrast leads to weaker(stronger) East Asian summer monsoon in June.Southerly(northerly)wind anomalies at 850 hPa then show up in the south of the Yangtze River basin while northerly(southerly)wind anomalies dominate in the north.These anomalies lead to the convergence(divergence) of wind and water vapor and hence gives rise to more(less) precipitation in June over the MLR-YRB.  相似文献   

Comparison of ground truth location of earthquake from InSAR and from ambient seismic noise: A case study of the 1998 Zhangbei earthquake   总被引：1，自引：0，他引：1  

Jun Xie  Xiangfang Zeng  Weiwen Chen  Zhongwen Zhan CAS Key Laboratory of Geodynamical Laboratory 《地震学报(英文版)》2011,(2):239-247

Because ambient seismic noise provides estimated Green’s function (EGF) between two sites with high accuracy, Rayleigh wave propagation along the path connecting the two sites is well resolved. Therefore, earthquakes which are close to one seismic station can be well located with calibration extracting from EGF. We test two algorithms in locating the 1998 Zhangbei earthquake, one algorithm is waveform-based, and the other is traveltime-based. We first compute EGF between station ZHB (a station about 40 km a...  相似文献   

Estimated Green’s function extracted from superconducting gravimeters and seismometers     

Xiangfang Zeng Zhongwen Zhan  Yong Zheng  Mengcheng National Geophysical Observatory  School of Earth  Space Sciences  University of Science  Technology of China  China Seismological Laboratory  California Institute of Technology  Pasadena CA  USA CAS Key Laboratory of Dynamical Geodesy 《地震学报(英文版)》2011,(2):143-150

Estimated Green’s function (EGF) between stations has been extracted from ambient seismic noise, direct surface wave and coda waves. It is also confirmed by laboratory experiments on ultrasonics and theoretical derivations assuming diffusive wave field, equi-partition of modes or random sources on an enclosed surface. This method provides a new approach to study the crust and mantle structure at regional scale, continental scale and global scale. Following the achievements with seismometer records, the reco...  相似文献   

江苏地区介质非弹性衰减和场地响应研究   总被引：1，自引：0，他引：1  

詹小艳  许红梅  王俊  霍祝青  江昊琳  缪发军  徐戈 《地震地磁观测与研究》2011,32(6):22-27

选取江苏数字地震台网在2001年1月-2010年7月记录到43次高质量数字地震波形,采用Atkinson(1992)和Moya(2000)的方法,反演得到江苏地区的介质非弹性衰减特性和场地响应.  相似文献   

陆川县冬种马铃薯生产中瓶颈问题的气象探索     

洪展  周展程 《气象研究与应用》2011,32(4):49-50,66

对陆川县主栽的马铃薯品种黑龙江K3紫花,采用稻草免耕栽培措施分四次播种进行试验,对试验中造成马铃薯的出苗期烂种、生长后期晚疫病等原因的气象条件进行分析,并探索解决的方法。  相似文献