Inorder to further study the vertical distribution characteristics of the shallow geothermal temperature field in the southeastern of Hancheng

Guanzhong Basin. The authors used temperature measuring cable

which is single line multipoint communication

to monitor stratum temperature in a depth of 50 meters for one year in Hancheng. The results shows that the vertical distribution of shallow geothermal temperature is regularity and obviously layered

it can be differentiated as variable temperature zone

constant temperature zone and increased temperature zone. The buried depth of the bottom of variable temperature zone is 15 m

it is significantly affected by climate. Compared with the temperature change of atmosphere

the variable temperature zone has a hysteresis phenomenon. The constant temperature zone depth range is between 15~35 m

and the average temperature is 15.3 ℃

1.8 ℃ higher than the annual average atmospheric temperature in the same region. The increased temperature zone is below 35 m

and the geothermal gradient is 3.25 ℃/hm within 35~100 m

which is higher than surrounding area. It is concluded that there are three reasons: firstly

the Hancheng fault is heat conduction channel to carry deep heat to shallow formations; secondly

the groundwater runoff intensity is relatively weak to save heat; thirdly

the loose stratum of quaternary and neogene is thick

which can reduce thermal conduction.