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Magnitude determination using strong ground‐motion attenuation in earthquake early warning
Author(s) -
Lin TingLi,
Wu YihMin
Publication year - 2010
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2010gl042502
Subject(s) - magnitude (astronomy) , attenuation , seismology , peak ground acceleration , geology , earthquake warning system , ground motion , acceleration , strong ground motion , geodesy , warning system , earthquake magnitude , physics , computer science , optics , geometry , telecommunications , classical mechanics , astronomy , mathematics , scaling
We use 1661 strong‐motion accelerograms with peak ground acceleration (PGA) larger than 80 Gal (1 Gal = 1.0 cm/s 2 ) from 77 earthquakes recorded by the Taiwan Strong Motion Instrumentation Program (TSMIP) stations to derive a strong‐motion attenuation relationship. This relationship can be used to dynamically define a “ M pga magnitude” for earthquakes using earthquake locations determined by earthquake early warning process. The M pga magnitude using this strong‐motion attenuation relationship corresponds well with M w given a sufficient number of PGA readings. MEMS (Micro Electro Mechanical Systems) acceleration sensor could be widely used for ground motion monitoring purposes. Thus, we propose that once a large earthquake has begun, that we might be able to use strong, near‐field (tens of kilometers) PGA values to quickly estimate the earthquake's magnitude, which would improve earthquake early warning.