Montegrossi Giordano, Farina Angiolo, Fusi Lorenzo, De Biase Antonietta
IGG Istituto Geoscienze e Georisorse, CNR, Via la Pira 4, Firenze, 50121, Italy.
Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, INSTM, Via G. Giusti 9, Firenze, 50134, Italy.
Sci Rep. 2019 Oct 8;9(1):14417. doi: 10.1038/s41598-019-50675-2.
Harmonic tremors consist in the release of infrasonic energy associated with volcanic activity. The typical frequency range of harmonic tremors is 0.1-12 Hz. We suppose that the harmonic tremors are due to the formation of bubbles entrapped in cavities that oscillate converting thermal energy into mechanic energy. Reproducing the natural phenomenon through an experimental apparatus, we propose here a mathematical model to describe the oscillatory mechanism and to detect the frequency as a function of the main physical parameters. We show that the frequency obtained through the model is in agreement with the one obtained through experimental measurements and with the data available from the literature, proving the consistency of the proposed model.
谐波震颤是由与火山活动相关的次声能量释放所构成。谐波震颤的典型频率范围是0.1 - 12赫兹。我们推测谐波震颤是由于被困在腔体中的气泡形成，这些气泡振荡并将热能转化为机械能。通过实验装置再现自然现象，我们在此提出一个数学模型来描述振荡机制，并检测作为主要物理参数函数的频率。我们表明通过该模型获得的频率与通过实验测量获得的频率以及文献中可用的数据一致，证明了所提出模型的一致性。
