The　response　mechanism　of　tunnels　under　earthquake　loads　is　a　critical　issue　in　tunnels　located　in　seismically　active　regions.　This　study　aims　to　investigate　the　seismic　response　and　damage　sensitivity　of　tunnels　under　earthquake　motions　with　different　peak　ground　acceleration,　velocity　and　displacement　(PGA,　PGV　and　PGD).　Based　on　the　design　acceleration　response　spectrum　(ARS),　four　groups　of　total　40　artificial　accelerograms　are　synthesized　with　specified　PGA,　PGV　and　PGD.　In　addition,　for　considering　the　wave　travelling　effect　on　the　tunnel　axial　response,　an　obliquely　incident　method　for　P　waves　is　developed　by　using　the　equivalent　nodal　force　method.　Then,　the　nonlinear　response　of　tunnels　subjected　to　artificial　accelerograms　with　different　incident　angles　are　simulated,　respectively.　The　numerical　results　indicate　that　the　PGV　and　PGA　have　accretion　effect　on　the　seismic　response　of　the　tunnel.　However,　the　impact　of　PGD　on　the　tunnel　earthquake　response　is　less　evident.　The　PGV　has　obvious　incremental　effect　on　the　dynamic　response　of　tunnels　subjected　to　earthquake　P　waves　with　large　incident　angles.　Compared　with　PGV,　the　PGA　intends　to　increase　the　response　of　tunnels　significantly　under　P　waves　with　small　incident　angles.　Thus,　it　is　important　to　take　the　PGA　and　PGV　into　account　during　seismic　analysis　and　design　for　tunnels.