In several recent reports. we have explained the frequency dependence of the apparent seismic quality-factor (Q) observed in many studies according to the effects of geometrical attenuation. which was defined as the zero-frequency limit of the temporal attenuation coefficient. In particular. https://www.roneverhart.com/10-oz-Black-Thermal-Plastic-Molcajete-Bowl-5-1-4-x-5-1-4-x-2-1-2-1-count-box/