时间域拉东变换的实现及其改进

介绍了时间域拉东正反变换的基本原理及该项技术在地震数据处理中的应用。以Ng和Perz的算法为基础,以开发地震勘探处理与解释系统为实例,解决了实验中遇到的拉东正变换时收敛精度、反变换数据无损还原和截断信号引起的能量扩散、低信噪比情况下的滤波等问题,进一步研究了改进算法在其他地形下应用问题。     

Dipping-interface Mapping Using Mode-separated Rayleigh Waves

Multichannel analysis of surface waves (MASW) method is a non-invasive geophysical technique that uses the dispersive characteristic of Rayleigh waves to estimate a vertical shear (S)-wave velocity profile. A pseudo-2D S-wave velocity section is constructed by aligning 1D S-wave velocity profiles at the midpoint of each receiver spread that are contoured using a spatial interpolation scheme. The horizontal resolution of the section is therefore most influenced by the receiver spread length and the source interval. Based on the assumption that a dipping-layer model can be regarded as stepped flat layers, high-resolution linear Radon transform (LRT) has been proposed to image Rayleigh-wave dispersive energy and separate modes of Rayleigh waves from a multichannel record. With the mode-separation technique, therefore, a dispersion curve that possesses satisfactory accuracy can be calculated using a pair of consecutive traces within a mode-separated shot gather. In this study, using synthetic models containing a dipping layer with a slope of 5, 10, 15, 20, or 30 degrees and a real-world example, we assess the ability of using high-resolution LRT to image and separate fundamental-mode Rayleigh waves from raw surface-wave data and accuracy of dispersion curves generated by a pair of consecutive traces within a mode-separated shot gather. Results of synthetic and real-world examples demonstrate that a dipping interface with a slope smaller than 15 degrees can be successfully mapped by separated fundamental waves using high-resolution LRT.     

模拟水氡观测数据快速整理软件简析

介绍了为解决模拟水氡资料数字化问题而编制的模拟水氡观测数据处理软件的特点、功能以及使用方法等．认为,该软件经黑龙江省多个台（点）和辽宁沈阳台使用,效果良好,可大大提高工作效率。     

水氡动态图强震危险区预测的新方法

水氡动态图强震危险区预测法是一种地下流体的地震分析预报新方法。 对该方法做了系统的介绍,其内容有: 水氡基值变化率动态图像的生成方法,水氡变化率高值异常区图形演化与地震震中位置的关系,强震危险区预测的标志与方法。检验性预测结果表明,该方法具有预测效能,可在实际地震预报中使用。     

Radon in Himalayan springs: a geohydrological control

 This paper presents the results of radon measurements in springs of the Himalayan region by using radon emanometry technique. The radon was measured in different springs, draining from different geohydrological setups, and from stream water in order to find the geohydrological control over radon concentration in groundwater emanating in the form of spring. The radon values were found to vary from 0.4 Bq/l to 887 Bq/l, being observed lowest for a turbulent stream and highest for the spring. The radon values were recorded highest in the springs draining through gneiss, granite, mylonite, etc. Radon concentrations have been related with four spring types viz. fracture-joint related spring, fault-lineament related spring, fluvial related spring and colluvial related spring, showing geohydrological characteristics of the rocks through which they are emanating. The high radon concentration in fracture-joint and fault-lineament spring is related to increased ratio of rock surface area to water volume and uranium mineralisation in the shear zones present in the close vicinity of fault and thrust. The low concentration of radon in fluvial and colluvial springs is possibly because of high transmissivity and turbulent flow within such deposits leading to natural de-emanation of gases. Received: 6 January 1998 · Accepted 11 May 1999     

旅游溶洞内氡污染和从业人员的辐射防护

在我国南方许多已辟为旅游景区(点)的溶洞中,氡及其子体浓度严重偏高,有的甚至超过放射性矿区坑道作业面上最大容许浓度,危害旅游从业人员和游客的健康,应引起有关部门的重视。      

霍州矿区隐伏断裂（带）活动性氡气测试成果解释分析

采用断层气体测试方法,对霍州盆地矿区内几条主要的隐伏断裂（带）及其活动性进行了测试。进而对该区典型的氡气测试成果剖面作了解释分析,并判别了隐伏断裂（带）的空间分面具主其相对活动强弱与活动水平等有关断裂活动性问题。     

求解Radon变换改进Fourer算法的误差分析

本文将对求解Ｒａｄｏｎ变换的改进Ｆｏｕｒｉｅｒ算法进行误差分析,证明了在Ｌ２范数下改进Ｆｏｕｒｉｅｒ算法是收敛的且具有Ｏ（１／ｑ）敛阶,其中２ｑ为像素点矩陈阶数。     

多项式Radon变换

Radon变换是数据处理中广泛应用的一种方法技术.本文介绍了次数为“2”的多项式Radon变换.讨论了多项式正反Radon变换的公式、实现方法和有关计算参数的选择.通过理论模型试算，对多项式、线性、抛物线三种Radon变换进行了比较.对实际资料进行了多项式Radon变换处理，给出了消除地震反射记录中线性干扰的算例.     

Correlation between geology and radon levels in groundwater, soil and indoor air in Bhilangana Valley, Garhwal Himalaya, India

 Radon concentrations were measured in soil, air and groundwater in Bhilangana Valley, Garhwal Himalaya, India by using an LR-115 plastic track detector and radon emanometer. Radon concentrations were found to vary from 1 KBq/m³ to 57 KBq/m³ in soil , 5 Bq/l to 887 Bq/l in water and 95 Bq/m³ to 208 Bq/m³ in air. The recorded values are quite high due to associated uranium mineralization in the area. Radon concentration was also found to depend on the tectonic structure and geology of the area. Received: 22 July 1996 · Accepted: 8 January 1997