Before we answer this question, let’s see what hand tamping is. As a general term, “hand tamper” can refer to a variety of machines that are used to compact items or materials. Tampers, as an example, are hand compactors used for compacting soil or other fine particles; they are constructed from a long handle and a heavy steel plate at the end, which is used to press or slam them against materials.
The relationship between force and frequency is inverse in soil liquefaction. To achieve an ideal state of compaction, a higher frequency can be applied. Compared to plate tampers operating at 15 Hz, plate tampers operating at 30 Hz require half the power.
Hand tamping produces a frequency of 1 to 2 Hz and very little force. Due to this, hand tamping can effectively compact the soil only in the first few centimeters. A compaction-approaching ideal can be achieved with just a few centimeters (or less) of additional tamping (but at a great cost of human effort and time). Compaction passes are fewer when power is higher, as is the frequency (say, 60 Hz).
Moisture levels in the soil can also have an effect. The soil moisture should be 11% water to 89% soil. It’s wrong to make mud slurries