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Seismic energy release in Mexican subduction zone earthquakes

Instituto de Geofisica UNAM Cuidad Universitaria, 04510 Mexico DF, Mexico
Instituto de Ingeniería UNAM Cuidad Universitaria, 04510 Mexico DF, Mexico
Centro Nacional de Prevención Desastres, Delfin Madrigal 665, 04650 Mexico DF, Mexico

Abstract

We estimated radiated seismic energy (E_s) from 18 shallow, thrust Mexican subduction zone earthquakes (4 x 10²² M₀ 1.1 x 10²⁸ dyne-cm; 11 H 37 km) using digital accelerograms from the Guerrero Accelerograph Array and neglecting stations with large site effects. E_s is computed by integrating squared velocity spectra, after applying geometrical spreading and Q corrections. We discarded epicentral recordings for the largest Michoacán event. We find that log (E_s/M₀) = –4.152 ± 0.275, which gives a median value of E_s/M₀ and apparent stress (_a) of 7.1 x 10^–5 and 24 bars, respectively. The median E_s/M₀ value is in accordance with Gutenberg and Richter's (G-R) (1956) formula for E_s, in which E_s/M₀ = 5 x 10^–5 is implicit. Worldwide E_s/M₀ data, where E_s is computed from local records, mostly fall between 5 x 10^–5 and 5 x 10^–4 for events with M₀ 10²² dyne-cm. On the other hand, E_s/M₀ values, generally, lie between 5 x 10^–6 and 5 x 10^–5, if E_s is estimated from teleseismic records. Especially anomalous are the E_s/M₀ data from Kikuchi and Fukao (1988) for large and great earthquakes, which fall near 5 x 10^–6. Thus, while E_s from local data suggests that the G-R relation seldom overestimates seismic energy release, the teleseismic data point to the contrary. The cause of this discrepancy may lie in the difficulty of resolving incoherent radiation from the fault and inappropriate choice of t^* in the analysis of teleseismic data.

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