Seismol Geomagn Obs Res 25(6):1–12 (in Chinese)Ĭhen YT, Wu ZL, Wang PD (2000) Digital seismology. Bull Seismol Soc Am 86(1A):73–78Ĭhen YT, Liu RF (2004) Earthquake magnitude. Ĭavallini F, Rebez A (1996) Representing earthquake intensity-magnitude relationship with a nonlinear function.

Ĭastellaro S, Mulargia F, Kagan YY (2006) Regression problems for magnitudes. Ĭastellaro S, Bormann P (2007) Performance of different regression procedures on the magnitude conversion problem. Ĭarroll RJ, Ruppert D (1996) The use and misuse of orthogonal regression in linear errors-in-variables models. The results are significant for seismic hazard analyses, seismic zoning, and mid- and long-term forecast analyses of seismic activities in the area.īormann P, Liu RF, Ren X, Gutdeutsch R, Kaiser D, Castellaro S (2007) Chinese national network magnitudes, their relation to NEIC magnitudes, and recommendations for new IASPEI magnitude standards. The results provided empirical formulas to unify magnitude scales for the earthquakes in China’s seas and neighboring regions and also provided an important basis for seismic catalog integrity analyses and seismic activity studies for this area. We used the linear least squares regression method and the orthogonal regression method to fit the seismic data under different magnitude ranges and different focal depth ranges. We employed data collected by the Chinese Earthquake Network Center, GCMT, and NIED for earthquakes of magnitude 4.5 and higher in China’s seas and neighboring regions from 1976 to 2018. To unify the magnitude scales of earthquakes in China’s seas and neighboring regions, we developed conversion relationships between surface- and body-wave magnitudes and the global centroid moment tensor (GCMT) and National Research Institute for Earth Science and Disaster Resilience (NIED) moment magnitudes for shallow and intermediate- and deep-focus earthquakes in China’s seas and adjacent areas. An earthquake catalog based on a unified magnitude scale is an important prerequisite for analyses of seismic activities and seismic hazards.

Moment magnitude scale formula