Magnitude scaling relationships from the first 3 s of P-wave arrivals in South Korea

• Published in: Journal of seismology 2010-10, Vol.14 (4), p.761-768
• Main Authors: Park, Yongcheol, Park, Sun-Cheon, Kim, Kwang-Hee, Park, Minkyu, Lee, Joohan
• Format: Article
• Language: English
• Subjects: Arrivals; Displacement; Early warning systems; Earth and Environmental Science; Earth Sciences; Earth, ocean, space; Earthquakes; Earthquakes, seismology; Engineering and environment geology. Geothermics; Errors; Exact sciences and technology; Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences; Grounds; Hydrogeology; Internal geophysics; Natural hazards: prediction, damages, etc; Original Article; Seismic activity; Seismic phenomena; Seismology; Simulation; Stations; Structural Geology; Waveforms
• ISSN: 1383-4649; 1573-157X
• DOI: 10.1007/s10950-010-9198-3

Two empirical magnitude scaling relationships, predominant period ( ) and peak ground displacement ( Pd ) magnitudes, were investigated for the first 3 s after P-wave arrivals using 1,412 vertical waveforms recorded by the Korea National Seismic Network (KNSN) between 2001 and 2007. To evaluate the accuracy of the derived magnitude relationships, we simulated off-line ElarmS tests using 65 events occurring inside the KNSN. While the average magnitude error was ∼0.70 magnitude units when using only the closest station to the epicentre, the error dropped to ∼0.62 and ∼0.42 magnitude units when using the closest two and closest four stations, respectively. For events M L  ≥ 3.0, the average magnitude error was ∼0.33 and showed stable values when the closest four stations were available. Our magnitude scaling relationships may be useful for initial work in developing an earthquake early warning system in South Korea.