Various far-field hydrological responses during 2015 Gorkha earthquake at two distant wells

Abstract Aquifer hydraulic parameter can change during earthquakes. Continuous monitoring of the response water level to seismic waves or solid Earth tides provides an opportunity document how earthquakes influence hydrological properties. Here, we use data two groundwater wells, Dian-22 (D22) and Lijiang (LJ) well, in southeast Tibet Plateau 2015 Mw 7.8 Gorkha earthquake illustrate implications. The coherences wave before after far-field show systematic variations, which may confirm coseismic dynamic shaking at high frequencies ( f > 8 cpd). tidal levels these wells shows abrupt changes both phase shift amplitude ratio earthquake, be interpreted as occurrence vertical permeability a switched semiconfined aquifer D22 enhancement unconfined LJ well. Using continuous short-term transmissivity monitoring, that possible for about 10 days instant healing causal impact. Thus, have caused responses by reopening preexisting fractures later epicentral distances 1500 km.