Development of an on-site Data Processing System-and-Application Soft for Reconnaissance Survey to Estimate Deep Geological Structure Using Microtremors

开发了基础程序和系统应用软件，为一种新的勘探技术提供了简单、快速的数据处理，该技术利用在任何时间、任何地点都能观测到的微震，具有相当稳定的频谱。该技术通过7 ~ 10台地震仪组成的地震阵列观测，通过测量周期大于1周期的微震表面波（瑞利波）的相速度，可以以s波速度分布的形式估计深度约3km的地质结构。该技术的数据处理包括估计功率谱和交叉谱。对于表面波相速度的测量，F-K方法计算频率-波数功率谱密度（F-K谱），SPAC方法计算空间自相关系数（SPAC系数）。然后用反演技术将面波相速度反演为横波速度分布。这些数据处理所需的所有基础程序和应用软件都包含在新开发的应用软件“BIDOU”中，其中还提供结构模型的瑞利波或洛夫波的理论相速度。利用s波速度随深度的分布，也给出了部署地震仪阵列和确定地质结构的空间位置剖面的横截面，为此开发了“DANMEN”软件程序。“DANMEN”项目可以连接各个层，在部署阵列的地点下确定s波速度。这些开发的程序和软件完全集成了使用微震的新勘探技术的数据采集和处理，在PC上的Widows 3.1中运行。这些强大的程序和软件已经在50多个站点进行了测试，并获得了良好的结果。

The fundamental programs and system-and-application softs have been developed for easy and quick data-processing for a new exploration technique which makes use of microtremors observable at any time in any place with a fairly stable spectrum. The technique can estimate geologic structure in a form of S-wave velocity distribution down to a depth of about 3km from measuring phase velocities of surface waves (Rayleigh waves) in microtremors with periods longer than Is, by observing with a seismic array consisting of 7 to l0 seismometers.The data processing in the technique includes estimating power spectra and cross spectra. For the measurement of phase velocities of surface waves, frequency-wavenumber power spectral densities (F-K spectra) for the F-K method, and spatial autocorrelation coefficients (SPAC coefficients) for the SPAC method are calculated from microtremor data observed. The phase velocities of surface waves are then inverted to an S-wave velocity distribution by an inversion technique.All the fundamental programs and application softs required with these data processing are included in the newly developed application soft 'BIDOU', in which the theoretical phase velocities of either Rayleigh or Love waves for a structure model are also available.A cross section of profile withspatially placed sites where seismometer arrays are deployed and geologic structures are determined is also given by S-wave velocity versus depth distribution, for which the soft program 'DANMEN' has been developed. The program 'DANMEN' can link with respective layrs for S-wave velocities determined under the sites where arrays are deployed.These developed programs and softs are fully integrated data acquisition and processing for a new exploration technique using microtremors, operating in Widows 3.1 on PC.These powerful programs and softs have been tested at more than 50 sites where good results have been obtained.