Development of SH Wave Generator for Seismic Sounding by High Pressure Gas Method

地震测深用SH波发生器最初是在1988财政年度开发的，它使用高压气体作为能源。该试验发生器于1988财政年度制造，并已进行了性能测试，检查其安全操作和到1990财政年度产生地震波场的潜在功率。测试生成器的效率总结如下：1。试验发生器运行安全，可重复产生波场.测试发生器有效地辐射SH波，没有噪音。试验发生器辐射的SH波具有较宽的频带.测试发生器辐射SH波，具有尖锐的开始。测试发生器辐射SH波精确可重复的振幅控制的气体压力。试验发生器辐射出的SH波的振幅比木板发生器辐射出的SH波的振幅大一倍左右，这些结果使我们判断试验发生器的试验阶段已经结束，并将继续进行实际应用的发生器的研制。

SH wave generator for seismic sounding has been originally developed in FY1988, which uses high pressure gas as energy source. The test generator was made in FY1988 and its performance tests have been done checking its safety operations and its potential power to generate seismic wave field through FY1990. The efficiencies of the test generator are summarized as follows :1. Test generator operates safety and it can generate wave field repeatedly.2. Test generator effectively radiates SH waves without noisy sound.3. Test generator radiates SH waves of wide frequency band.4. Test generator radiates SH waves with sharp onset.5. Test generator radiates SH waves precisely repeatable with amplitude controlled by the gas pressure.6. Test generator radiates SH waves with about twice larger amplitude than those by the wooden plate generator.All these results lead us to judge finalizing the testing stage of the test generator and to move on to develop the generator for the practical uses.