Portland-Colac 1:250000 Gravity (P199530), gravity point data

Gravity data measures small changes in gravity due to changes in the density of rocks beneath the Earth's surface. The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. This Portland-Colac 1:250000 Gravity (P199530) contains a total of 868 point data values acquired at a spacing between 200 and 1200 metres. The data is located in VIC and were acquired in 1995, under project No. 199530 for Department of Minerals and Energy (Victoria).

重力数据用于测量地球表层下方岩石密度变化所引发的微小重力场变化。所采集的原始数据将通过标准流程进行处理，以确保记录的重力响应仅由地下岩石的密度变化引起。处理后得到的数据集可通过解译揭示地下地质构造。经处理的数据将由GA地球物理学家开展质量核验，以确保GA发布的最终数据符合使用要求。本波特兰-科莱克1:250000重力数据集（P199530）共包含868个测点数据，测点间距介于200米至1200米之间。该数据采集于1995年，采集区域为VIC（维多利亚州），所属项目编号为199530，服务于维多利亚州矿产与能源部。