Study of Single-fouce seismic source for deep borehole and seafloor deployment

设计了一种可在深井和海底长期监测地震波传播特性的震源。我们制作了这种震源的试验模型，以测试我们概念设计的可行性。在钻孔和海底环境中的困难要求是低功耗，即50瓦。提出了一种在圆柱体中产生单力的下落质量模型，该模型适用于小体积物体产生低频信号。实验结果表明，落块源工作良好，但落块运动轨迹会因落块和落块导轨的摩擦而发生较大变化。这就需要对质量下落进行监测。

A seismic source for long-term monitoring of propagation property by deploying in deep-borehole and seafloor are designed. We produced trial models for such a seismic source to test the feasibility of our conceptual design. The difficult requirement in borehole and seafloor environment is low-power consumption, i.e. 50watts. We developed a model with falling mass in a cylinder body to produce single-force, which is suitable to produce low-frequency signal with small body. Experiments using trial model shows that falling-mass source works well but falling trajectory varies substantially due to friction of mass and mass guide. This requires the monitoring of the mass falling.