Abstract: The main topic in earthquake dynamics is to deal with rupture processes, faulting mechanism, source radiation, and propagation of the radiated seismic waves and ground motions, on which seismic hazard assessment is based. Critical theories of earthquake mechanics, source radiation and energy release are intensively studied in this paper for a completeness of systematic investigation on the topic. Using the state - of- the - art methods for seismic hazard analysis, with which the seismological, geological and geodetic inputs are combined into logic trees, samples of the ground - motion evaluation are applied to the typical tectonic sources of earthquakes including the crustal seismogenic zones, subduction interfaces and intraslabs. Various ground motion attenuation models with respect to faulting mechanism were examined and demonstrated through both the probabilistic and deterministic approaches. Uncertainties exist in either aleatory variability or epistemic uncertainty, but a weighted average of various alternatives in probabilistic seismic hazard analysis （PSHA） and the combination in methodology of PSHA and DSHA （deterministic seismic hazard analysis） should better prevent it from producing an extremely biased output of hazard estimates.