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Macroseismic and Microseismic Events Declustering for Korea Peninsula
Ekaputra Rhajendra,Eric Yee,Minyoung Kang,Changkyu Lee,Soojin Jung,Euihyun Jung 대한토목학회 2023 대한토목학회 학술대회 Vol.2023 No.10
This research focuses on declustering the earthquake catalog by removing non-independent events, such as foreshocks and aftershocks. The Gardner and Knopoff (GK) method, known for its simplicity and efficiency, is used for declustering. However, the GK method may inadvertently remove more events than necessary and cannot handle complex cascading event sequences. The results showed that approximately 71% of the earthquake catalog consisted of independent events. Nonetheless, there were limitations in the data distribution and gaps in information for events outside a specific magnitude range. Further analysis is required to assess the usability of macroseismic events and analyze ground motion prediction equations using a refined catalog. This project emphasizes the significance of declustering and considering event independence in seismic hazard analysis for the Korean Peninsula.
Estimating a Maximum Magnitude
Minyoung Kang,Eric Yee,Ekaputra Rhajendra,Changkyu Lee,Soojin Jung,Euihyun Jung 대한토목학회 2023 대한토목학회 학술대회 Vol.2023 No.10
This research discusses maximum magnitude for each seismic source in Korea, and to compare the maximum magnitude before and after the 2016 Gyeongju and 2017 Pohang earthquakes. Based on the Wells and Coppersmith(1994), the largest possible earthquake is estimated to have a magnitude of 7.9 from Tsushima faults. The application of the measured fault length as the surface rupture length introduces a potential for overestimating the values of high-magnitude.