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.

Corbi, F., Funiciello, F., Brizzi, S., Lallemand, S., Rosenau, M. (2017). Control of asperities size and spacing on seismic behavior of subduction megathrusts. GEOPHYSICAL RESEARCH LETTERS, 44(16), 8227-8235 [10.1002/2017GL074182].

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

Corbi, Fabio
Membro del Collaboration Group
;
Funiciello, Francesca
Membro del Collaboration Group
;
Brizzi, Silvia
Membro del Collaboration Group
;
2017-01-01

Abstract

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.
Corbi, F., Funiciello, F., Brizzi, S., Lallemand, S., Rosenau, M. (2017). Control of asperities size and spacing on seismic behavior of subduction megathrusts. GEOPHYSICAL RESEARCH LETTERS, 44(16), 8227-8235 [10.1002/2017GL074182].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/329064
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 31
  • ???jsp.display-item.citation.isi??? 29
social impact