The slow often imperceptible downslope movement of soil or other debris is called creep.
Geologic creep. Observation of the effects of creep such as bent trees tilted fences and cracked walls usually leads to identification of the problem. Side b all sounds recorded in the usa. This diagram shows how a single particle gradually moves down the slope. Fremont california a house sitting on the calaveras fault in 2003.
Even soil covered with close knit sod creeps downslope as indicated by slow but persistent tilting of trees poles gravestones and other objects set into the ground on hillsides. Creep of the hayward fault has displaced this curb since its construction about 15 years prior. The gentlest form of landslide. Geological creep sonically surfing the landscape disparate forms released 20 march 2014 1.
Because creep moves materials so slowly it is difficult to discern directly. Geological creep portland oregon. Geologic units of similar ages are shown on a geologic map using the same color and symbol. A geologic map shows geologic units of various rock types and ages.
Click to view larger and see the legend. Ice crystals picking up soil particles on prospect mt in the adirondacks. Creep takes a long time because each particle might only move a millimetre to a few centimetres at a time. Fault creep also called aseismic creep happens at the earths surface on a small fraction of faults.