Are the frictional properties of creeping faults persistent? Evidence from rapid afterslip following the 2011 Tohoku‐oki earthquake

[1] Geophysical observations and numerical studies have shown that creeping portions of faults have persistent rate-strengthening frictional properties and can act as barriers to earthquake rupture propagation. On the basis of GPS data following the 2011 MW 9.0 Tohoku-oki earthquake in Japan, we find that the evolution of afterslip and postseismic shear stress on the plate interface is inconsistent with persistent rate-strengthening frictional properties but is consistent with slip-rate-dependent frictional properties that exhibit less rate-strengthening with increasing slip rate. Such slip-rate-dependent frictional properties tend to prevent creeping regions from acting as barriers to rupture propagation and therefore could be an important factor in determining the spatial extent of individual earthquakes.

[1]  N. Lapusta,et al.  Stable creeping fault segments can become destructive as a result of dynamic weakening , 2013, Nature.

[2]  K. Sieh,et al.  Supporting Online Material for Frictional Afterslip Following the 2005 Nias-Simeulue Earthquake, , 2006 .

[3]  Paul Segall,et al.  Space time distribution of afterslip following the 2003 Tokachi‐oki earthquake: Implications for variations in fault zone frictional properties , 2004 .

[4]  Anthony Sladen,et al.  Seismic and aseismic slip on the Central Peru megathrust , 2010, Nature.

[5]  Tomoyuki Higuchi,et al.  Geodetic inversion for space–time distribution of fault slip with time-varying smoothing regularization , 2008 .

[6]  Hugo Perfettini,et al.  Postseismic relaxation driven by brittle creep: A possible mechanism to reconcile geodetic measurements and the decay rate of aftershocks, application to the Chi-Chi earthquake, Taiwan , 2004 .

[7]  Chen Ji,et al.  Partial rupture of a locked patch of the Sumatra megathrust during the 2007 earthquake sequence , 2008, Nature.

[8]  J. Boatwright,et al.  Frictional constraints on crustal faulting , 1996 .

[9]  Timothy H. Dixon,et al.  REVEL: A model for Recent plate velocities from space geodesy , 2002 .

[10]  C. Scholz Earthquakes and friction laws , 1998, Nature.

[11]  J. Weeks,et al.  The frictional behavior of serpentinite: Implications for aseismic creep on shallow crustal faults , 1991 .

[12]  V. Popov Earthquakes and Friction , 2010 .

[13]  Y. Ito,et al.  3D modeling of the cycle of a great Tohoku‐oki earthquake, considering frictional behavior at low to high slip velocities , 2011 .

[14]  J. Nakajima,et al.  Anomalous low‐velocity zone and linear alignment of seismicity along it in the subducted Pacific slab beneath Kanto, Japan: Reactivation of subducted fracture zone? , 2006 .

[15]  Nadia Lapusta,et al.  Towards inferring earthquake patterns from geodetic observations of interseismic coupling , 2010 .

[16]  Akira Hasegawa,et al.  Characteristic small‐earthquake sequence off Sanriku, northeastern Honshu, Japan , 2002 .

[17]  K. Satake,et al.  Unusually large earthquakes inferred from tsunami deposits along the Kuril trench , 2003, Nature.

[18]  Tomokazu Kobayashi,et al.  Preceding, coseismic, and postseismic slips of the 2011 Tohoku earthquake, Japan , 2012 .

[19]  E. Kissling,et al.  A model of deep crustal fluid flow following the Mw = 8.0 Antofagasta, Chile, earthquake , 2004 .

[20]  A. Kato,et al.  Regional extent of the large coseismic slip zone of the 2011 Mw 9.0 Tohoku‐Oki earthquake delineated by on‐fault aftershocks , 2012 .