基于Oracle Spatial的环境应急数据库设计

环境应急数据涉及多源异构的多种数据,目前都是以文件或者其他互不兼容的形式存储,这给数据的一致性、完整性、时效性以及日后的维护都带来了困难。采用Oracle Spatial技术,对环境应急数据库中的空间数据和属性数据进行一体化存储设计,并给出了实现的实际步骤。     

基于互联网的地图标注系统设计与实现

基于互联网的地图标注系统涉及到点、线和面的标注,对解决地图数据生产所面临的现势性、完备性、正确性以及准确性问题具有积极的意义.系统是在0racle数据库、POI搜索引擎和瓦片地图数据服务的基础上,采用Ajax技术、NHibernate技术设计开发而成的,文章给出了系统的设计和实现.     

由Lg波振幅谱估算地震矩及Lg波Qem>值

采用一种多事件多台站的Lg波谱反演方法, 同时反演若干新疆伽师地震的地震矩M0、源拐角频率fc及从这些地震的震中到8个中亚地震台站(WMQ， AAK，TLG，MAKZ，KUR，VOS，ZRN和CHK)的传播路径所对应的视QLg模型参数. 反演得到的地震矩与质心矩反演结果具有较好的相关性，而且在利用区域震SV波的平均源辐射因子的典型值来进行校正后，二者在数值上也基本一致. 同时，反演得到的地震矩与面波震级也具有很好的相关性. 反演得到的视Q0Lg(1 Hz时的QLg)与路径的构造特征相符合. 其中，AAK，TLG和MAKZ 3个台站对应的传播路径，绝大部分在地形起伏强烈、地震活动性强的天山地区对应的Q0Lg较小，分别为35187，34986和30027. KUR，VOS，ZRN和CHK 4个台站的传播路径大部分在比较稳定的哈萨克地台，对应的Q0Lg较大，分别为55372，56958，55057和60365；而WMQ对应的传播路径基本上沿塔里木盆地及天山边缘地带，沿传播路径的地形和地壳厚度的变化，不如沿至MAKZ台的传播路径的变化那么剧烈，因此，其Q0Lg也比到MAKZ对应的传播路径的Q0Lg大，反演结果为46256.      

基于互联网的地图标注系统设计与实现

基于互联网的地图标注系统涉及到点、线和面的标注,对解决地图数据生产所面临的现势性、完备性、正确性以及准确性问题具有积极的意义。系统是在Oracle数据库、POI搜索引擎和瓦片地图数据服务的基础上,采用Ajax技术、NHibernate技术设计开发而成的,文章给出了系统的设计和实现。     

Estimating seismic moments and Lg Q using Lg spectra

A multi-event and multi-station inverse method is presented in the paper to simultaneously estimate the seismicmoments (Mo) and source comer frequencies (fc) of several Jiashi (Xinjiang, China) earthquakes, as well as theapparent Lg Q models for the paths from Jiashi to eight seismic stations (WMQ, AAK, TLG MAKZ, KUR, VOS,ZRN and CHK) in Central Asia. The resultant seismic moments correlate well with the Mo values obtained by Harvard University using the centroid moment tensor (CMT) inversion and the surface-wave magnitudes as well. Afterthe correction by a typical value of average radiation coefficient for regional SV waves, the Mo values from Lgspectral inversion are still close to the corresponding values obtained from CMT inversion. The obtained apparentQOLg values (Lg Q at 1 Hz) are consistent with the tectonic features of corresponding propagation paths. The QoLgvalues are 351±87, 349±86 and 300±27 for the paths from Jiashi to AAK, TLG and MAKZ, respectively. They aresmaller than QoLg values for the paths to KUR, VOS, ZRN and CHK, which are 553±72, 569±58, 550±57 and603±65, respectively. These results agree with the condition that the paths to AAK, TLG and MAKZ mainlypropagate through the mountainous Tianshan area where relatively strong seismic activities and large variations oftopography are exhibited, while the paths to KUR, VOS, ZRN and CHK mainly propagate through the stable areaof Kazak platform. The QoLg value for the path to WMQ is 462±56. This is also in agreement with the conditionthat the path to WMQ is basically along the border area between Tianshan Mountain and Tarim Basin, and alongthis path the variations of topography and crustal thickness are moderate in comparison with that along the path toMAKZ.