The Spring-block model: A model of earthquakes as interlocking phenomena of rock rupture to investigate the relationship between the size and number of earthquakes that occur, so called G-R Law. Experts naturally use computer simulations, however Kato (2011) reported this as an analog experiment using actual blocks and springs. Inspired by this, we developed the following analog models as teaching materials. These models also provide a relationship between the size and frequency of earthquakes that satisfies the G-R rule, but when shown to students as desk experiments, we believe that they can help them understand that it is very difficult to predict the timing and size of the next big earthquake.