预测地波定时信号传播时延的经验方法

在参考文献（２,３）的基础上,提出了含有大山区的复杂陆地地波路径的分段和确定各段路径等效电导率σｃ的方法,给出如何利用接收点场强实测值和已有的理论色散修正曲线（δｔ－ｄ）＾（６）近似计算色散修正值的方法,并对４条含大山区的复杂路径信号传播时延实测值ｔｇ＾－（收）与预测值ｔｇ进行比较,结果表明：路径分为３段等效时的预测准确度要比整段等效高得多。     

Protection of a monumental building against traffic-induced vibrations

To preserve an ancient building in Rome against traffic-induced vibrations, an anti-vibration system was introduced under the paving of the near Lungotevere road. An experimental investigation was recently carried out by ENEA in order to analyse the traffic-induced vibrations in the basement of the building and the effectiveness of the intervention. Wave propagation in the soil around the building in presence of the anti-vibration paving was compared with that in absence of the anti-vibration paving. The study showed the importance of the taking into account the contribution of other structures in the area to the dynamic behaviour of the whole system.     

空间相关的多点地震动合成(Ⅱ)合成实例

本文应用已提出的自功率谱、相干函数、视速度模型生成了空间相关的多点地震动时程。采用分段合成、乘强度包络函数的方法近似地考虑了地震动强度和频率尬发的非平稳性、生成的地震动符合空间相关性、传播性、随机性和非平稳性,可用于长结构多点输入地震反应分析。     

1998年1月10日张北—尚义6.2级地震地下水位异常的检验性预测

分析了距张北－尚义ＭＳ６．２地震震中１１０ｋｍ范围内,内蒙古自治区前光台网地下水位高值异常特征,利用水化前兆标志及判定方法探讨了水位高值异常与张北－尚义地震的关系,并对其判定指标进行了统一约定,分别用异常频次累加加速判别指标值异常频次综合变化速率值二项指标对张北－尚义ＭＳ６．２地震进行了中期、短期、短临尺度的检验性预测,张北－尚义ＭＳ６．２地震的发震时间基本符合判断结果,指出地下水位高值异常是１９     

可调频调液柱型阻尼器振动控制参数研究

本文介绍了建筑结构利用可调频调液柱型阻尼器减小结构振动的控制系统,由于增设了频率控制装置,增加了ＴＬＣＤ的应用范围,文中阐述了利用ＴＬＣＤ系统减振的基本原理,确定了有关的影响参数并介绍了建筑结构利用ＴＬＣＤ进行振动控制的计算方法。     

大震前地下流体的远场中期前兆异常

通过研究安微省五河井水位、沪江井井压和流量的观测资料,笔发现了大震前远场中期异常的证据。菲律宾８．０级地震（１９９０年７月１６日）前,五河井（Δ＝２０３３ｋｍ）水位的Ｍ２波的振幅比α和相位差Δθ,均有近１７个月的低值异常;庐江井（Δ＝１８００ｋｍ）井压和流量均存在近３６个月的低值异常。台湾海峡７．３级地震（１９９４年９月１６日,五河井（Δ＝１１２１ｋｍ）水位Ｍ２波α和Δθ以及庐江井（Δ＝９３０ｋ     

Micro-FTIR spectroscopy of liptinite macerals in coal

Reflectance FTIR microspectroscopy has been used to investigate the chemical structure of the liptinite macerals, alginite, bituminite, sporinite, cutinite and resinite in bituminous coals of Carboniferous to Tertiary age. In comparison with the spectra of vitrinite in the same coals, the micro-FTIR spectra of liptinite macerals are characterized by stronger aliphatic CH_x absorptions at 3000–2800 and 1460–1450 cm⁻¹, less intense aromatic C=C ring stretching vibration and aromatic CH out of plane deformation at 1610–1560 and 900–700 cm⁻¹ respectively and various intense acid C=O group absorptions at 1740–1700 cm⁻¹. The peaks at 1000–900 cm⁻¹ due to aliphatic CH₂ wagging vibrations in olefins and at 730–720 cm⁻¹ due to CH₂ rocking vibration in long chain aliphatic substances ([CH₂]_n, n≥4), are characteristic of liptinite macerals. Collectively the micro-FTIR spectral characteristics indicate that liptinite is composed of greater numbers of long chain aliphatics, fewer aromatics and a broader range of oxygen-containing groups than other macerals. Marked differences exist in micro-FTIR spectra within the liptinite maceral group. Alginite has the strongest aliphatic and least aromatic absorptions followed by bituminite, resinite, cutinite and sporinite. The aliphatic components in alginite are the longest chained and least branched whereas those in sporinite are the shortest chained and most branched. Bituminite, resinite and cutinite are intermediate. Notable differences in micro-FTIR spectra of individual liptinite macerals, such as intensities and peak locations of aromatic C=C in alginite, C=O groups in bituminite and resinite and substituted aromatic CH and C–O–C groups in cutinite and sporinite, also exist, which are attributed to differences in depositional environments or biotaxonomy.     

Improving the level of seismic hazard parameters in Saudi Arabia using earthquake location

Saudi Arabia is characterized as largely aseismic; however, the tectonic plate boundaries that surround it are very active. To improve characterization of seismicity and ground motion hazard, the Saudi Arabian Digital Seismic Network (SANDSN) was installed in 1998 and continues to be operated by the Saudi Geological Survey (SGS) and King Abdulaziz City for Science and Technology (KACST). This article describes research performed to improve seismic hazard parameters using earthquake location and magnitude calibration of the high-quality SANDSN data. The SANDSN consists of 38 seismic stations, 27 broadband, and 11 short period. All data are telemetered in real time to a central facility at KACST in Riyadh. The SANDSN stations show low background noise levels and have good signal detection capabilities; however, some stations show cultural noise at frequencies above 1.0 Hz. We assessed the SANDSN event location capabilities by comparing KACST locations with well-determined locations derived from ground truth or global observations. While a clear location bias exists when using the global average iasp91 earth model, the locations can be improved by using regional models optimized for different tectonic source regions. The article presents detailed analysis of some events and Dead Sea explosions where we found gross errors in estimated locations. New velocity models we calculated that should improve estimated locations of regional events in three specific regions include (1) Gulf of Aqabah—Dead Sea region, (2) Arabian Shield, and (3) Arabian Platform. Recently, these models were applied to the SANDSN to improve local and teleseismic event locations and to develop an accurate magnitude scale for Saudi Arabia. The Zagros Thrust presents the most seismic hazard to eastern Saudi Arabia because of the frequent occurrence of earthquakes. Although these events are 200 km or further from the Arabian coast, wave propagation through sedimentary structure of the Gulf causes long-duration ground motions for periods between 3 and 10 s. Such ground motions could excite response in large engineered structures (e.g., tall buildings and long bridges) such as was experienced after the November 22, 2005 Qeshm Island earthquake off the southern coast of Iran.     

浅谈地下水超采的防治对策

地下水的超采已是一个十分普遍而严重的问题。本文结合泰安市的具体情况 ,论述了地下水超采的危害和防治措施。     

Hydrogeologic Significance of the Association Between Well-Yield Variography and Bedrock Geologic Structures,Pinardville Quadrangle,New Hampshire

The spatial continuity of water-well yields is associated with the fracture properties of the crystalline basement rocks in the Pinardville quadrangle, New Hampshire. The analysis reported in this paper expands upon previous work of a study of 939 wells in the quadrangle. This expanded analysis was performed on updated and new geologic map data, new fracture-set data and analyses, and a set of water-well yields that was expanded by 752 newly located wells. Variogram mapping of the water-well yields formed the basis for the synthesis of the spatial continuity in well yield with the geological data. A variety of associations were determined that directly relate the spatial properties of well yields to the characteristics and structure of the crystalline bedrocks in the quadrangle.