Abstract
This chapter briefly presented a few models of rotational motions in the earthquake source. At first, rolling motions were considered and the kinetic energy of rolling was formulated. The second model deals with purely rotational motions. The kinetic energy, work, power, and angular momentum for this model were expressed in terms of earthquake dimensions and the total tectonic slip on the fault. The third model treats rotational motions in the earthquake source as turbulence of grains and blocks between moving tectonic plates. A general approach to the turbulence was discussed. A balance equation for the angular momentum was shown. An angular momentum for a small turbulent eddy was defined.
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