L159 Dubbo (Spicers Creek) 3D-3C high resolution seismic survey, NSW, 2003 Seismic acquisition data for lines 03GA-DB1 and 03GA-DB2

A multicomponent seismic survey using an IVI MiniVib as a source was carried out to assist in mapping of fracture porosity in shear zones in areas of dryland salinity for the School of Biological, Earth and Environmental Sciences (UNSW). The survey obtained a set of three dimensional, three component data at two sites near Spicers Creek, some 45km east of Dubbo. The acquisition was undertaken by Australian National Seismic Imaging Resource (ANSIR) from the 5th to the 12th April 2003 with the assistance of staff from UNSW. The objectives of this seismic survey are:1. Develop quantitative measure of azimuthal anisotropy of P- and S-waves using refracted head wave amplitudes. 2. Determine the relative effects of lithological fabric and fracture porosity on P- and S-wave anisotropy factors.3. Determine quantitative relationships between azimuthal anisotropy and fracture porosity.4. Measure the horizontal and vertical variability of the fracture porosity in the fracture zones which control the discharge of saline groundwater and the occurrence of dryland salinity at the three experimental sites in the Spicers Creek Catchment.5. Develop cost-effect field techniques for 3D - 3C (three dimensional - three component) shallow seismic refraction surveys for geotechnical, environmental and groundwater applications.

为协助新南威尔士大学（UNSW）生物、地球与环境科学学院绘制旱地盐渍化区域剪切带中的裂缝孔隙度分布图，开展了以IVI MiniVib为震源的多分量地震勘探。本次勘探在达博以东约45公里的斯派塞溪附近两个测点获取了一套三维三分量数据。数据采集工作由澳大利亚国家地震成像资源中心（ANSIR）于2003年4月5日至12日进行，并得到UNSW工作人员的协助。

本次地震勘探的目标如下：
1. 利用折射首波振幅建立P波和S波方位各向异性的定量测量方法。
2. 确定岩性组构和裂缝孔隙度对P波与S波各向异性因子的相对影响。
3. 建立方位各向异性与裂缝孔隙度之间的定量关系。
4. 测量斯派塞溪流域三个实验点中控制咸地下水排泄和旱地盐渍化发生的断裂带内裂缝孔隙度的水平与垂直变化特征。
5. 开发经济高效的三维三分量（3D-3C）浅层地震折射勘探野外技术，以应用于岩土工程、环境科学及地下水研究领域。