Seismicruptureproducedbyactivefaultingcausesgroundsurfacefracturingandseriouslydamagesbuildings.However,thefracturetracesareusuallyindistinctornon-visiblebecauseofcomplicateddeformationsinQuaternaryunconsolidatedmaterials,sotheirupperpartscanhardlybediscoveredonexploratorytrenches.Theaimofthispaperistostudythetypesoffaultruptureanddisplacementindifferentloosedepositbedsfromajointviewofmega-,meso-,andmicroscopicscales,andtofindthemarkandmethodfortimingthepalaeoseismicruptureonexploratorytrenches.