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Radiated energy estimations from finite‐fault earthquake slip models
Author(s) -
Senatorski Piotr
Publication year - 2014
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 - 10.1002/2014gl060013
Subject(s) - slipping , slip (aerodynamics) , seismology , geology , term (time) , seismic energy , energy (signal processing) , seismic wave , fault (geology) , physics , geometry , mathematics , quantum mechanics , thermodynamics
Radiated seismic energy is expressed in terms of slip velocities by using an overdamped dynamics approximation. This formulation is used to estimate the radiated energy from earthquake finite‐fault models. A correction term is found to show that the approximation underestimates the radiated energy as defined by the full dynamics. The accuracy of the overdamped dynamics solution depends on the rupture history. Two dislocational earthquake models illustrate the dependence of the correction term on the rupture speed and slipping area size. The radiated seismic energies estimated from the finite‐fault models and from seismic waves are compared for real‐world earthquakes. The results are consistent in most cases. Discrepancies between two estimates suggest that both the finite‐fault models and energy estimations from teleseismic data should be revised.