Determination of Mining-Induced Changes in Hydrogeological Parameters of Overburden Aquifer in a Coalfield, Northwest China: Approaches Using the Water Level Response to Earth Tides

Figure 4

The observed hourly spaced record for (a) water levels, (b) barometric pressures, and (c) rainfall. The blue and red vertical dash lines show the times when the longwall excavation zone is closest to the J10 and J7 wells, respectively. The coal face advancing distance is the distance from the coal face startup.