L033 Latrobe Valley experimental seismic reflection and refraction survey, VIC, 1958

An experimental seismic survey using both refraction and reflection techniques was carried out in April, 1958, near Morwell in the Latrobe Valley at the request of the State Electricity Commission of Victoria. The object of the survey was to find if the method was of value in mapping the structure of the coal measures of the Latrobe Valley and in providing information on the depth to and type of basement underlying the coal measures. Work was concentrated in an area south-west of Morwell on the southern limb of the Latrobe Syncline. The results obtained indicate that the seismic method may be applied successfully to geological problems of the Latrobe Valley and may provide useful control data for the interpretation of surface geological and gravity mapping. Various interpretations of the results are discussed and although some ambiguity exists, it might be overcome when more work is done, particularly if an accurate knowledge of the velocities of the coal easures is obtained. It has been possible by means of refraction work to map the extension of the basalt which crops out on the southern margin of the Latrobe Syncline beneath the coal measures with reasonable certainty.

1958年4月，受维多利亚州电力委员会（State Electricity Commission of Victoria）委托，研究团队在拉特罗布谷（Latrobe Valley）的莫尔韦尔（Morwell）附近开展了一项结合地震折射与反射技术的实验性地震勘探。本次勘探的目的在于验证该方法在绘制拉特罗布谷煤系地层构造图，以及获取煤系地层下伏基底的埋藏深度与类型相关信息方面的应用价值。勘探工作重点集中于莫尔韦尔西南侧的拉特罗布向斜（Latrobe Syncline）南翼区域。本次勘探结果表明，地震勘探方法可成功应用于拉特罗布谷的地质研究工作，能够为地表地质测绘与重力测绘的解译提供有用的控制数据。本文对勘探结果的多种解译方案进行了讨论，尽管当前存在一定的解译多解性，但通过开展更多勘探工作，尤其是在准确获取煤系地层波速数据后，该多解性问题或可得到解决。借助折射勘探技术，已可较为可靠地圈定出出露于拉特罗布向斜南缘的玄武岩在煤系地层下方的延伸范围。