Constraints on Volcanic Tremor Source Models from Worldwide Measurements of Tremor Amplitudes, Frequencies, Wave Types and Durations

9418219 McNutt该项目将支持一名博士后研究员完成世界各地塔尔160座火山的现有火山地震数据库。 要研究的最重要的参数是震颤的振幅，其被归一化为减小的位移。 这个问题和地震震级的测定一样重要。 初步结果表明，地震减少的位移在喷发过程中成正比的火山爆炸性指数（VEI），这是成正比的火山灰体积。 我们建议测试的假设，火山震颤的能量是成正比的岩浆体积和它所包含的挥发分。 我们将测量震颤的地震效率，我们显示的初步数据表明，有不同的效率为不同的喷发机制。 该项目是对许多理论研究的补充。 它是广泛和广泛的，因为它包括来自世界各地所有已知的地震监测火山的数据。 虽然该项目的主要价值是科学性的，但有几个组成部分，特别是相对于VEI减少位移，也对火山灾害评估和预测有直接影响。

9418219 McNutt This project will support a post-doctoral investigator to complete an existing database ion volcanic tremor from more thal 160 volcanoes around the world. The most important parameter to be investigated is the amplitude of tremor which is normalized to reduced displacement. This problem is as fundamental as the determination of earthquake magnitudes. Preliminary results show that tremor reduced displacements during eruptions are proportional to the Volcano Explosivity Index (VEI), which is proportional to the tephra volume. We propose to test the hypothesis that the energy of volcanic tremor is directly proportional to the volume of magma and its contained volatiles. We will measure the seismic efficiencies of tremor, and we show preliminary data that suggest there are different efficiencies for different eruptive mechanisms. This project is complementary to many theoretical studies. It is broad and wide ranging because it includes data from all known seismically monitored volcanoes worldwide. Although the chief value of the project is scientific, several components, especially reduced displacement versus VEI, also have a direct bearing on volcanic hazards assessment and forecasting.