<Anchor> It
was confirmed that the magnitude 4.9 earthquake that occurred in Jeju two days ago affected the Jeju groundwater fault. The level of groundwater in the Seogwipo area, where there was a lot of vibration, has risen sharply.
This is the exclusive report of JIBS reporter Chang-beom Cho.
<Reporter>
At 5:19 pm on the 14th, an earthquake shook the whole of Jeju.
The earthquake with a magnitude of 4.9 on the Richter scale that occurred on the 14th was found to have affected the level of groundwater in Jeju.
There are currently two places where the groundwater level has changed: Seoho-dong, Seogwipo-si and Gosan-ri, Hangyeong-myeon.
The water level of the underground water observation network in Seoho-dong, which normally showed a water level of about 34m, rose by 90cm immediately after the earthquake.
[Lee Soo-hyeong / Senior Researcher, Korea Institute of Geoscience and Mineral Resources: It is thought that the groundwater in an area higher than the coastal zone moved downward due to shaking due to earthquakes.]
Observation network in Gosan-ri, Seogwipo-si, where the water level is below sea level The water level has risen by about 6 cm.
In addition, the electrical conductivity EC was observed to fluctuate between the lowest 751 μs/cm and the highest 962 μs/cm.
It is said that there is a high possibility that seawater or foreign substances have penetrated from the outside because there is a gap between the underground rocks.
The Jeju Groundwater Research Center plans to collect samples from two observation networks in the near future and begin detailed analysis.
Attention has been drawn to the results of a detailed investigation into how the Jeju earthquake affected the groundwater layer, the only water resource in Jeju.
(Video coverage: Kang Hyo-seop JIBS)