基于数码相机的孔群定位与数控钻孔

提出基于数码相机摄像、螺孔影像中心定位、多站摄像、自检校光束法平差、螺孔群的一次定位以及数控钻孔的一整套新生产流程。强调在摄像测量中以像素为单位表示像方所有量(包括像点坐标、内方位元素和各类畸变)的可行性，而且此种措施简化了非方形像素间隔的检校。     

上海城市三维景观模型的制作

通过实践分析了城市三维建模技术的现状，并提出了在数字城市建设中城市三维建模的要点以及今后的研究方向。     

数字工程建设与空间信息产业化

从当前数字工程建设的现状与需求出发，论述了数字工程的概念和技术特点，指出数字工程的技术创新和应用拓展将会进一步推动空间信息产业化。     

Digital photogrammetry as a tool in analogue modelling: applications to volcano instability

Three techniques of digital photogrammetry have been applied successfully to laboratory analogue models to study surface displacements caused by various volcano deformation types. Firstly, side-perspective videos are used to differentiate profile displacements between cryptodome intrusion models and models deforming by ductile inner-core viscous flow. Both models show similar morphologic features including a bulged flank and an asymmetric upper graben. However, differences in displacement trajectories of the bulge crest reflect upward intrusion push contrasting with essentially downward displacement vectors of weak core models. The other two techniques use vertical views correlated automatically either as time-sequence monoscopic views or as coeval stereoscopic pairs. This exploits to a maximum the method’s potential by imaging surface displacements over the whole model. Successive monoscopic photograms, because they suffer only moderate numerical processing for topographic effect removal, can detect very small displacements occurring early in deformation processes. As illustrated by analysis of intrusion models, the monoscopic method allows prediction of fault locations and main displacement locations. It can also anticipate the principal strain directions, and separate different deformation stages. On the other hand, the stereo-photogrammetry technique, although more complicated, provides topography and volume changes, as well as pictures of surface displacements in three dimensions. Results are presented for the spreading of volcano models on a ductile substratum and viscous cored cones. We have found digital photogrammetry to be a useful tool for analogue modelling, because it provides quantitative data on surface displacements, including movement invisible to the eye, as well as topographic changes. It is a good method for investigating and comparing different deformation mechanisms. It is especially useful for interpretation of displacement patterns obtained from monitoring of natural active volcanoes. In fact, results of the methods used in the laboratory can be directly compared with field data from geodetic or photogrammetric surveys, as at Mount St. Helens in 1980.     

Effect of causal and acausal filters on elastic and inelastic response spectra

With increasing interest in displacement spectra and long‐period motions, it is important to check the sensitivity of both elastic and inelastic response spectra to the filtering that is often necessary to remove long period artifacts, even from many modern digital recordings. Using two records of very different character from the M=7.1, 1999 Hector Mine, California, earthquake, we find that the response spectra can be sensitive to the corner periods used in causal filtering, even for oscillator periods much less than the filter corner periods. The effect is most pronounced for inelastic response spectra, where the ratio of response spectra computed from accelerations filtered at 25 and 200 sec can be close to a factor of 2 for oscillator periods less than 5 sec. Published in 2003 by John Wiley Sons, Ltd.     

2000年姚安地震的震源参数

根据近场小孔径观测台网记录的余震序列资料，研究了2000年1月15日云南姚安MS6.4地震序列的地震物理过程. 用地震标定律关系估算主震的地震矩M0=1.58×1018N·m，矩震级MW=6.0，平均位错=0.63m，断层长度L=16.6km，断层宽度W=5.6km. 余震序列的高精度定位结果和能量分布走向，很好地证实了主震的断层破裂走向为N50°W，震区马尾菁断裂为主震发震构造，断层错动性质以右旋走滑为主. 用横波记录资料及波谱分析方法估算出余震的震源参数: 地震矩范围为1010～1016N·m，震源破裂半径a为80～500m，地震应力降范围为0.01～9.5MPa. 较大应力降(Δσ>1.0MPa)沿主断层线性排列，大应力降(Δσ>2.0MPa)与ML≥3.0级地震相关. 余震能量释放和高应力降的地震多发生在6.0～11km的深度范围，说明在这一深度范围内最大程度地集中了地壳中的应力.     

周至深井水震波数字化记录与地震波记录的对比研究

介绍了周至深井井孔概况和水位观测的仪器设备配置，通过对2000年10月6日日本本州7．3级地震的水震波数字化记录的频谱分析，与陕西数字地震台网同一地震事件进行对比研究，结果表明，周至深井可以记录到周期大于2s的水震波，对地动位移的放大倍率约为200倍，带宽大于DK-1地震仪和FBS-3地震计，相当于一台深井宽带地震仪。     

会昌地震台数字与模拟地震波形和震级的对比初探

通过会昌台数字与模拟地震记录到的多个地震事件进行对比分析，认为前者在记录带宽、获取更多的地震动物理量、记录波形能力及可操作性等方面具有显著的优势，数字观测完全可以取代模拟观测；对两种记录计算的地震震级进行了对比与统计分析，发现数字记录近震的震级比远震的偏差要大，远震震级可直接与全国地震目录接轨。     

地震观测技术展望

展望了将高新技术用于地震观测的前景，利用高新技术改善地震监测预报条件，扩大观测范围和增强综合分析能力，建立新型的三维观测系统，开展“空中、地表、深部”的观测研究；建立动态的数字地球模型，开辟研究地震的新领域，将使准确预报地震成为可能。     

基于MAPGIS数字化地形图的技术应用

以数字化四川雅安地区白铜尖子地形图为例，从数据输入、数据处理两方面入手，结合实践经验，详细阐述了运用MAPGIS数字化地形图时的一些关键技术，主要包括图件的输入、分层矢量化的输入、图形编辑、高程数据的编辑、水系编辑、坐标匹配和误差校正，供GIS领域的研究人员参考。