Study of rock anelasticity for seismological application

最近的实验研究表明，多晶材料的滞弹性服从麦克斯韦频率(Fm)标度：1/Q(Fn)，Fn=f/Fm。然而，由于实验室中的fn通常比地震波(6&lt；log_10(Fn)&lt；9)的fn低得多，这种标度对地震波的适用性并未得到保证。我们用多晶有机冰片作为地幔岩石的类似物，测量了高达log_10(Fn)=8的滞弹性，发现这种标度在log_10(Fn)和Gt不完全适用；4.进一步的研究表明，在不同温度、不同晶粒度和不同化学成分下得到的每个弛豫谱都可以用Maxwell频率标度的背景和位于log_10(Fn)~3处的峰的叠加来表示。随着温度、漏极大小和杂质含量的增加，峰的幅度和宽度显著增加，导致在log_10(Fn)和gt；

Recent experimental studies have shown that anelasticity of polycrystalline materials is subject to the Maxwell frequency (fm) scaling: 1/Q(fn) with fn=f/fm. However, the applicability of this scaling to the seismic waves has not been guaranteed because fn in the laboratory is usually much lower than that of the seismic waves (6 < log_10(fn) < 9). By using polycrystalline organic borneol as an analogue to mantle rock, we measured anelasticity up to log_10(fn) = 8 and found that this scaling is not fully applicable at log_10(fn) > 4. A closer examination showed that each of the relaxation spectra obtained under various temperature, grain size, and chemical composition can be represented by the superposition of a background subject to the Maxwell frequency scaling and a peak centered at log_10(fn) ~ 3. Significant increases of the peak amplitude and width with increasing temperature, drain size, and impurity content result in failure of the Maxwell frequency scaling at log_10(fn) > 4.