Seismotectonic model of Aketao earthquake focal zone 25.11.2016 Mw 6.6 (China)

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Abstract

The paper presents the results of modeling of the stress-strain state of the epicentral zone of the strong crustal earthquake Aketao, which occurred near Muji (China) on November 25, 2016 with magnitude Mw 6.6. The finite element method was used to model the stress-strain state of the epicentral zone with subsequent construction of stress intensity maps before and after the earthquake. The possibility to determine the location of rupture origin, its extent, including estimation of scalar seismic moment and earthquake magnitude is shown. For the first time the possibility to calculate the time function of seismic moment Mo(t) (seismic moment rate) based on the model of stress-strain state of rupture (earthquake origin) is presented, which allows to obtain synthetic seismograms and accelerograms of possible earthquake in the future.

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About the authors

V. N. Morozov

Geophysical Center of the Russian Academy of Sciences

Email: a.manevich@gcras.ru
Russian Federation, Moscow

A. I. Manevich

Geophysical Center of the Russian Academy of Sciences; Mining Institute

Author for correspondence.
Email: a.manevich@gcras.ru
Russian Federation, Moscow; Moscow

References

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Supplementary files

Supplementary Files
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2. Fig. 1. Structural and tectonic diagram of the Aketao earthquake region, compiled based on materials from [6, 8]. 1 – epicenter of the main shock with M 6.6; 2 – tectonic faults.

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3. Fig. 2. Stress-strain state of the epicentral zone before the Aketao earthquake. a – stress intensity σi, MPa; b – ratio of the main acting stresses æ = σH / σh.

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4. Fig. 3. Aftershocks of the Aketao earthquake according to data from [8]. a – graph of the distribution of aftershocks by depth (red dotted line – Gaussian function (1), for given parameters h0 = 10 km; b = 3 km; A = 1); b – distribution of aftershocks by depth along the rupture.

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5. Fig. 4. Stress-strain state of the rupture. a – map of the difference in stresses ∆σi before and after the earthquake (stress drop); b – dropped stresses ∆τр along the fault surface after applying function (2); c – model of coseismic displacements obtained as a result of inversion of InSAR data [8].

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6. Fig. 5. Results of seismic moment modeling. a – dropped stresses ∆τр, 2×2 km cell model and rupture propagation at a speed of 2.8 km/s; b – time function of seismic moment Мо(t), obtained on the basis of the results of SSS modeling (red line – averaged values); c – time function of seismic moment Мо(t), obtained on the basis of seismological data [6].

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