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A global approach to provide magnitude estimates for earthquake early warning alerts
Author(s) -
Kuyuk Huseyin Serdar,
Allen Richard M.
Publication year - 2013
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 - 10.1002/2013gl058580
Subject(s) - magnitude (astronomy) , seismology , richter magnitude scale , geology , amplitude , warning system , earthquake warning system , scaling , earthquake magnitude , earthquake simulation , scale (ratio) , calibration , geodesy , statistics , geography , computer science , mathematics , physics , cartography , astronomy , telecommunications , geometry , quantum mechanics
We examine five different methods to estimate an earthquake's magnitude using only P wave data for use in earthquake early warning systems. We test two input parameters: the maximum predominant period of the P wave ( τ p max ) and the displacement amplitude of the P wave's vertical component (Pd). We apply our algorithms to 174 earthquakes 3.0 < M < 8.0 from California and Japan that have also been used in previous calibration studies. We also apply them to 1992 0.2 < M < 5.7 earthquakes that were processed by the real‐time Earthquake Alarm Systems in California. We find that τ p max does not scale with magnitude for small earthquakes ( M < 3) and is less accurate for large‐magnitude earthquakes than using Pd alone. We derive a global scaling relation between Pd and magnitude and conclude that this global relationship provides the most accurate and robust magnitude estimate. This relationship could be applied in earthquake source zones around the world.