Scaling relationship between the duration and the amplitude of non‐volcanic deep low‐frequency tremors

We investigate a duration‐amplitude relation of non‐volcanic deep low‐frequency (DLF) tremors in the Tokai region, southwest Japan, to constrain the source process of the tremors. We apply two models to the distribution, one is an exponential model as a scale bound distribution and the other a power law model as a scale invariant distribution. The exponential model shows a better fit to the duration‐amplitude distribution of the tremors than a power law model, implying that the DLF tremors are caused by a scale‐bound source process. The source process of the DLF tremors, therefore, differs from those for earthquakes. We suggest that the non‐volcanic DLF tremor is possibly caused by a fixed source dimension with variable excess pressure of fluid or variable stress drop.