Hydrographs indicating possible groundwater level changes due to quake

Examples of hydrographs indicating possible groundwater level changes due to January 23, 2018, Gulf of Alaska M7.9 earthquake. (These data are preliminary or provisional and are subject to revision.) These provisional data are presented in a combined, simplified figure to highlight the observed change in water levels associated with the earthquake. Note that water levels have not been corrected for barometric pressure and Earth tide affects