Controlled Source Electromagnetic Sounding of the Oceanic Lithosphere

本文提出了在25 ~ 40天进行海底有源电磁实验的建议。古老的岩石圈。许多接收器将被部署在加利福尼亚海岸附近的一个地点，信号源将沿着不同的路径被拖过阵列。数据将在许多传播范围和方向以及频率范围内收集。因此，将确定2至50公里深度范围内的电导率结构，以及该结构的横向各向异性和非均质性。这些数据将补充早先在不同年龄的岩石圈实验中得到的数据，从而初步估计出岩石圈的电导率与年龄的关系。这是一个独特的实验；这些信息是任何其他电学方法实验都无法获得的，应该能提供有关海洋岩石圈基本物理性质的重要信息。

This is a proposal to carry out an active source EM experiment on the sea floor on 25-40 my. old lithosphere. A number of receivers will be deployed at a site off the coast of California and the source will be towed through the array along various paths. Data will be collected over many ranges and directions of propagation and over a range of frequencies. Thus the electrical conductivity structure over a depth range of 2 to 50 km will be determined, and also the lateral anisotropy and heterogeneity of that structure. The data will complement that obtained in an earlier experiment on lithosphere of different age, so that an initial estimate of the electrical conductivity- age dependence of the lithosphere can be obtained. This is a unique experiment; the information cannot be obtained by any other electrical methods experiment and should provide important information about a fundamental physical property of the oceanic lithosphere.