“Further investigation is needed … a certain area should not be considered an ‘earthquake safe zone'”
As a result of the aftershock analysis of the magnitude 4.1 earthquake that occurred in Goesan, North Chungcheong Province last weekend, it was confirmed that the correlation is low with the ‘Okcheon Fault Zone’ estimated by some.
Choi Jin-hyeok, director of the Active Earth Research Center at the Korea Institute of Geoscience and Mineral Resources, said in an interview with Yonhap News on the 1st, “Given the trend of aftershocks, there is a possibility that it is not directly related to a zone Okcheon faults we are familiar with.”
The Okcheon fault is a fault that extends from the southern part of Gangwon to the Honam area and is considered a representative fault that passes through the Korean Peninsula along with the Chugiryeong fault and the Yangsan fault.
Some experts have mentioned that when the earthquake occurred in Goesan, the location of the epicenter was close to the Okcheon Fault and could be related.
In fact, as a result of the initial earthquake analysis, it was estimated that the northwest-southeast fault or northeast-southwest fault in the Goesan area described in the 1:250,000 geological map (Andongdopok) caused the earthquake.
According to Director Choi, the north-north-south-southwest fault is the fault associated with the Okcheon fault zone.
Accordingly, the Geological Survey installed four temporary observatories and investigated the distribution of aftershocks along the fault that caused the main earthquake.
In other words, earthquakes occur in a fault that is not related to the Okcheon fault zone.
However, the Geospatial Society of Korea said further investigations are needed to identify the fault that caused the earthquake.
Meanwhile, Center Director Choi said, “Earthquakes do not occur once every few years, but have a recurrence cycle of hundreds or thousands of years. .
He added, “Since our country installed seismometers in 1978, looking at the current sections, we can say that some places are safe and some are unsafe.”
/happy news
