Lubrication pressure and fractional viscous damping effects on the spring-block model of earthquakes G. B. Tanekou, C. F. Fogang, R. Kengne and F. B. Pelap Eur. Phys. J. Plus, 133 4 (2018) 150 Published online: 16 April 2018 DOI: 10.1140/epjp/i2018-11978-y