Repository: Freie Universität Berlin, Math Department

Control of asperities size and spacing on seismic behavior of subduction megathrusts

Corbi, F. and Funiciello, F. and Brizzi, S. and Lallemand, S. and Rosenau, M. (2017) Control of asperities size and spacing on seismic behavior of subduction megathrusts. Geophysical Research Letters, 44 (16). pp. 8227-8235.

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The majority of the largest subduction megathrust earthquakes share the common characteristic of rupturing more than one asperity along strike of the margin. Understanding the factors that control coseismic failure of multiple asperities, and thus maximum magnitude, is central for seismic hazard assessment. To investigate the role of asperities size and spacing on maximum magnitude, seismicity rate, and percentage of synchronized ruptures, we use analog models simulating along-strike rupture behavior of megathrust earthquakes. We found negative correlations between the barrier-to-asperity length ratio Db/Da and maximum magnitude and seismicity rate. Db/Da also controls the process of asperities synchronization along the megathrust. A permanent barrier behavior is observed for Db/Da > 0.5. Comparing our experimental results to the Nankai Trough historical seismicity, we propose that the distribution of megathrust frictional heterogeneities likely explains the diversity of earthquakes which occurred there.

Item Type:Article
Subjects:Mathematical and Computer Sciences > Mathematics > Applied Mathematics
ID Code:2142
Deposited By: Silvia Hoemke
Deposited On:05 Dec 2017 10:21
Last Modified:05 Dec 2017 10:21

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