The　dynamic　behaviors　of　wind　turbines　subjected　to　combined　wind-earthquake　loading　were　investigated.　Numerical　simulations　were　performed　to　examine　the　influence　of　wind　speed　and　earthquake　intensity　on　the　dynamic　behaviors　of　wind　turbines　after　evaluating　the　influence　of　randomness　of　wind.　Subsequently,　the　effect　of　start　time　and　input　angle　of　earthquakes　on　seismic　responses　of　wind　turbines　was　evaluated　to　explore　the　temporal　and　spatial　combinations　of　wind　and　earthquake　loads.　It　is　noted　that　the　wind　increases　and　decreases　the　response　amplitude　of　the　wind　turbine　under　weak　and　strong　earthquake　excitations,　respectively.　Consequently,　the　most　unfavorable　seismic　load　conditions　are　represented　by　the　wind-earthquake　combination　in　the　former　scenario　and　by　only　the　earthquake　case　in　the　latter　scenario.　Because　the　start　time　of　earthquakes　can　significantly　affect　the　dynamic　response　of　the　wind　turbine,　sufficient　wind　samples　must　be　generated　to　obtain　the　mean　of　the　response　amplitudes.　Moreover,　the　input　angle　of　earthquakes　influences　the　seismic　response　of　wind　turbines,　owing　to　the　asymmetry　of　aerodynamic　damping　and　blade　stiffness.　Consequently,　the　combination　of　wind　and　earthquake　excitations　in　the　space　domain　must　be　considered　prudently.