This　study　identified　soft-sediment　deformation　structures　(SSDS)　of　seismic　origin　from　lacustrine　sediments　in　the　late　Quaternary　paleo-dammed　lake　at　Tashkorgan,　northeastern　Pamir.　The　observed　deformation　structures　include　sand　dykes,　liquefied　diapir　and　convolute　structures,　gravity　induced　SSDS,　and　thixotropic　pillar　and　tabular　structures.　We　conducted　a　preliminary　study　on　the　morphology,　formation　and　trigger　mechanisms　of　pillar　and　tabular　structures　formed　by　liquefaction　of　underlying　coarse　sand　and　thixotropy　of　the　upper　silty　clay.　The　regional　tectonic　setting　and　distribution　of　lacustrine　strata　indicate　that　the　most　probable　trigger　for　the　SSDS　in　lacustrine　sediments　was　seismic　activity,　with　an　approximate　earthquake　magnitude　of　M＞6.0;　the　potential　seismogenic　fault　is　the　southern　part　of　the　Kongur　normal　fault　extensional　system.　AMS　C-14　dating　results　indicate　that　the　SSDS　were　formed　by　seismic　events　occurring　between　26050　+/-　100　yrBP　and　22710　+/-　80　yrBP,　implying　intense　fault　activity　in　this　region　during　the　late　Pleistocene.　This　study　provides　new　evidence　for　understanding　tectonic　activity　and　regional　geodynamics　in　western　China.