Singular value decomposition for interpretation of gravity data

Speaker: SU, Chien-lin

Date: 2013/11/21

Abstract

Propagating slip pulses in earthquake ruptures (Heaton, 1990) are studied based on a one-dimensional N degree- of-freedom dynamical spring-slider system with a constant ratio of static to dynamic frictional forces. Results show that for almost all cases in the study, the rise time of ruptures at a particular site is much smaller than the duration of ruptures along the whole fault. A propagating slip pulse is generated along the fault. Hence, simulation results are in agreement with Heaton's propagating slip-pulse model.
And we propose a novel mechanism of aftershock generation by evaluating changes in the stiffness ratio (or stiffness between two blocks) of a dynamical one-dimensional spring–block model. Simulations reveal the existence of spatiotemporal event clustering (i.e., aftershocks) associated with a preceding large event (i.e., the mainshock). Therefore, we suggest that changes in the stiffness or strength of materials play an important role in aftershock generation.

 

 

    • References

      Chen, C.C., Wang, J.H., One-dimensional dynamical modeling of slip pulses. Tectonophysics 487 (2010) 100–104.

       

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    • Chen, C.C., Wang, J.H., Huang, W.J., Material decoupling as a mechanism of aftershock generation. Tectonophysics 546-547 (2012) 56–59.

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