Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 44, Issue 9, Pages 4036-4045Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL073228
Keywords
energy magnitude; real-time seismology; seismic source parameters; 2016 Central Italy earthquakes; earthquake early warning; local magnitude
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Funding
- UniNA
- Compagnia di San Paolo
- NERA
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We propose a P wave based procedure for the rapid estimation of the radiated seismic energy, and a novel relationship for obtaining an energy-based local magnitude (M-Le) measure of the earthquake size. We apply the new procedure to the seismic sequence that struck Central Italy in 2016. Scaling relationships involving seismic moment and radiated energy are discussed for the M-w 6.0 Amatrice, M-w 5.9 Ussita, and M-w 6.5 Norcia earthquakes, including 35M(L)>4 aftershocks. The M-w 6.0 Amatrice earthquake shows the highest apparent stress, and the observed differences among the three main events highlight the dynamic heterogeneity with which large earthquakes can occur in Central Italy. Differences between estimates of M-Le and M-w allows identification of events which are characterized by a higher proportion of energy being transferred to seismic waves, providing important real-time indications of earthquakes shaking potential.
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