Soil Temperature
WARNING: Provisional Data, subject to revision
Each tensiometer and piezometer has a built in temperature sensor, either a thermistor or RTD (resistive temperature device). Soil temperature measurements are used in correcting measurements by the tensiometers and piezometers and in detecting when the ground is frozen.
Soil temperatures at tensiometers, last 4 days
![](https://webarchive.library.unt.edu/eot2008/20081105125539im_/http://landslides.usgs.gov/realtime/portland/soiltemp4t.png)