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http://dx.doi.org/10.14770/jgsk.2018.54.5.557

Characteristics of short term changes of groundwater level and stream flow rate during 2017 Pohang earthquakes  

Choi, Myoung-Rak (Department of Construction Safety and Disaster Prevention, Daejeon University)
Lee, Ho-Jeong (Department of Construction Safety and Disaster Prevention, Daejeon University)
Kim, Gyoo-Bum (Department of Construction Safety and Disaster Prevention, Daejeon University)
Publication Information
Journal of the Geological Society of Korea / v.54, no.5, 2018 , pp. 557-566 More about this Journal
Abstract
Pohang earthquake (Main shock magnitude = 5.4) occurred in Southeastern region of South Korea in November 15, 2017. Groundwater levels of 6 monitoring wells with 5 minutes interval measurements located in that region and stream water levels of 4 stations located along the Hyeongsan-gang stream are used for the analysis of earthquake induced effects. Four groundwater monitoring wells show a short-term decrease of groundwater level after a main shock and one well does an increase and the maximum change is about 42.0 cm. Especially, groundwater levels at two monitoring wells near the epicenter are consistently maintained after a decrease. There is little relationship between earthquake magnitude or a distance to epicenter and changing amount of groundwater level and it may be due to the inhomogeneity of geologic material and unconsolidated sediments distribution. The changes in permeability of fractured zone and groundwater levels occasionally cause changes in stream flow rate, and water level of the Hyeongsan-gang stream in the study area decreases just after the earthquake and increases again up to the normal level and next shows an more gentle decreasing slope. Total increasing flow rates at S1 (upstream site) and S4 (downstream site) stations are about $12,096m^3$ and $116,640m^3$, respectively, during the increasing period.
Keywords
earthquake; groundwater level; stream flow rate;
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