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![Page 1: IV. The seismic cycle IV. 1 Conceptual and kinematic models IV.2 Comparison with observations IV.3 Interseismic strain IV.4 Postseismic deformation IV.5.](https://reader035.fdocuments.net/reader035/viewer/2022062216/56649dc75503460f94abce65/html5/thumbnails/1.jpg)
IV. The seismic cycle
IV. 1 Conceptual and kinematic models
IV.2 Comparison with observations
IV.3 Interseismic strain
IV.4 Postseismic deformation
IV.5 Dynamic models
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Source Model of Nias Earthquake
Source duration: 100s,
Rupture velocity: 2-2.5 km/s;
Rise time: 15 sec
(Konca et al, 2007)
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Postseismic deformationPostseismic deformationover 11 monthsover 11 months
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Time evolution of postseismic slipTime evolution of postseismic slip
AFt taUtU /ln.)( 0
-The spatial distribution of afterslip is approximately stationary.- Slip increases in proportion to the logarithm of time
~ (Hsu et al, 2006)
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1995 Antofagasta earthquake, N. Chile (Mw = 8.0)
1993-95 Displacements (dominated by co-seismic)
1996-97 Velocities (2 years after earthquake)
Data from Klotz et al. (1999) and Khazaradze and Klotz (2003)
(From Kelin Wang, SEIZE meeting, 2008)
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Alaska: ~ 40 years after a great earthquake
M = 9.2, 1964
Freymueller et al. (2008)
The plate interface has partially or completely relocked in the rupture area.Some stations on land still move seaward!
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GPS data:
Green: Klotz et al. (2001)Red: Wang et al. (2007)
Chile: ~ 40 years after a great earthquake
M = 9.5, 1960
(From Kelin Wang, SEIZE meeting, 2008; Wang, 2007)
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Cascadia: ~ 300 years after a great earthquake
Wells and Simpson (2001)
(From Kelin Wang, SEIZE meeting, 2008; Wang, 2007)
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Rupture
Stress relaxation
Stress relaxation
Afterslip
Locking
Afterslip and transient slow slip: short-lived, fault frictionStress relaxation: long-lived, mantle rheology
(From Kelin Wang, SEIZE meeting, 2008; Wang, 2007)
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Inter-seismic (Cascadia)
Post-seismic 2(Alaska, Chile)
Co-seismic
Coast line
Coast line
Post-seismic1 (Sumatra)
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References
Hsu, Y. J., M. Simons, J. P. Avouac, J. Galetzka, K. Sieh, M. Chlieh, D. Natawidjaja, L. Prawirodirdjo, and Y. Bock (2006), Frictional afterslip following the 2005 Nias-Simeulue earthquake, Sumatra, Science, 312(5782), 1921-1926.
Wang, K, Elastic and Viscoelastic Models of Crustal Deformation in Subduction Earthquake Cycles, In The Seismogenic Zone of Subduction Thrust Faults, edited by T. Dixon and J. C. Moore, Columbia University Press, 2007 .
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IV. The seismic cycle
IV. 1 Conceptual and kinematic models
IV.2 Comparison with EQ observations
IV.3 Learning from interseismic strain
IV.4 Dynamic models
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• Kinematic model : the model is parametrised in term of the slip history on the fault (earthquakes, interseismic defornation, postseismic deformation….)
• Dynamic model: Deformation, including slip history on faults is deduced from the rheology and boundary conditions.
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Is this model consistent with our understanding of the mechanics of crustal deformation?
What is the reason for transition to the Locked Fault one to the Creeping zone?
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Crustal Rheology
(Kohlstedt et al., 1995)
‘brittle’
‘ductile’
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(Mackwell et al., 1998)
In all plots solid lines are linear least squares fit to the data. Dotted lines represent fit to data of the flow-law at the bottom of each plot
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Static Friction is generally of the order of 0.6 for most rock types(Byerlee, 1978)
The shear stress at frictional yield depends linearly on normal stress
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-unstable slip is possible if the decrease of friction is more rapid than elastic unloading during slip (‘slip weakening’)
- The fault needs to restrength with time afetr slip event (‘healing’).
Condition for ‘stick-slip’ sliding
Stick-slip motion requires weakening during seismic sliding, hencestatic friction > dynamic friction
(Scholz, 1990)
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(Marone, 1998)
Dc
Dynamic friction decreases with slip rate
Static friction depends on hold time
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Rate-and-State Friction
=*(T)+a ln(V/V*)+b ln(*)
d/dt=1-V /Dc
(Dieterich 1981; Ruina 1983)
(Scholz, 1990)
Generally a and b are of the order of ~ 10-3-10-2 (e.g., Blanpied et al, 1998; Marone, 1998)
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Rate-and-State Friction
=*(T)+a ln(V/V*)+b ln(*)
d/dt=1-V /Dc
(Dieterich 1981; Ruina 1983)
(Scholz, 1990)
At steady state: ss= Dc /V ss*+(a-b) ln(V/V*)
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Effect of temperature and normal stress on friction
A, Dependence of (a - b) on temperature for granite . B, Dependence of (a - b) on pressure for granulated granite. This effect, due to lithification, should be augmented with temperature.
Laboratory experiments show that stable frictional sliding is promoted at temperatures higher than about 300°C, and possibly at low
temperatures.
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• Rate strengthening (a-b>0) : – quartzo-feldspathic rocks :T<100C or T>300C – poorly cohesive fault-gouge– Some clays at low temperature (T<100C), – serpentine (T<400C).
(Marone, 1998)
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Condition for ‘stick-slip’
Stick-slip motion requires weakening during seismic sliding, hencestatic friction > dynamic friction
- unstable slip is possible if the decrease of friction is more rapid than elastic unloading during slip (‘slip weakening’)
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Condition for ‘stick-slip’
• At steady state:
• The system is rate-strengthening if a-b>0, only stable sliding is permitted
• The system is rate-weakening if a-b<0,
ss*+(a-b) ln(V/V*)
F/u>K, i.e. (s-d) σn/Dc>K
- stick-slip slip is possible if the decrease of friction is more rapid than elastic unloading during slip:
- The system undergoes stable frictional sliding (conditional stability) if
(Rice and Ruina 1983; Sholz, 1990)
F/u<K, i.e. (s-d) σn/Dc<K
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ss=*+(a-b) ln(V/V*)
a-b > 0
stable sliding
a-b < 0
slip is potentially unstable
Correspond to T~300 °C
For Quartzo-Feldspathic rocks
Stationary State Frictional Sliding
(Blanpied et al, 1991)
(Rice and Ruina 1983)
a-b
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Tinter= 96.2 ans
Seismic Cycle Modeling
(Perfettini et al, 2003)
Slip as a function of depth. Each line representsthe slip distribution at a given time. Every 5 yr in the interseismic period. For velocity change of 10% durin dynamic rupture.
Maximum sliding velocity on the fault as afunction of time.
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Slip as a function of depth over the seismic cycle of a strike–slip fault, using a frictional model containing a transition from unstable to stable friction at 11 km depth
(Tse and Rice, 1981; Shloz, 1992)
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Aseismic stable frictional becomes dominant for temperatures above ~ 300°C-400°C.
This is consistent with laboratory experiments which show that stable frictional sliding (a-b>0) is promoted at temperatures higher than about 300°C for Quartzo-felspathic rocks.Fluids may play a role too (cf MT results).
From Blanpied et al, (1991)
(Avouac, 2003)
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Frictional sliding (rate-and-state friction)=*+a ln(V/V*)+b ln(*)
d/dt=1-V /Dc
Ductile Flowdε/dt = A fH2O
m σ n ℮-Q/RT
Constitutive laws used to model crustal deformation and the seismic cycle
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FEM code: ADELI (Hassani, Jongmans and Chery 1997)
Rheology: Brittle failure (Drucker-Prager criterion) Non linear, temperature dependent creep law
Surface processes: Linear diffusion + flat deposition in the foreland
Boundary conditions: Hydrostatic fundation, 20 mm/yr horizontal shortening
(Cattin and Avouac, JGR, 2000)
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(Cattin and Avouac, JGR, 2000)
Mechanical model
- FEM ADELI (Hassani, Jongmans and Chery 1997)
- Rheology: Coulomb brittle failure + Non linear creep law depending on local temperature.
- Surface processes: linear diffusion and flat deposition in the foreland
- Boundary conditions: Hydrostatic fundation, 18mm/yr horizontal shortening
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(Cattin and Avouac, JGR, 2000)
Due to the thermally activated flow law the model predicts a localized ductile shear zone that coincides with the creeping zone of the MHT.
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21 +/-1.5 mm/yr
The effective friction on the MHT needs to be low (<0.1)
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• Provided that effective friction on MHT is low (<0.1), the model reconciles geodetic and holocene deformation
• Seismicity falls in the zone of enhanced Coulomb stress in the interseismic period
Modeling InterseismicDeformation
(Cattin and Avouac, 2000)
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Modeling postseismic Deformation
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Modeling postseismic Deformation
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Viscoelastic stress relaxation model for Chile, viscosity 2.5 1019 Pa s
(c)
(Hu et al, 2004)
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(hu et
Earthquake followed by
locking
(Hu et al, 2004)
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Different along-strike rupture lengths and slip magnitudes(surface velocities 35 years after an earthquake;
mantle viscosity 2.5 x 1019 Pa s)
(Hu et al, 2004)
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A simple Fault Model
Locked Fault Zone
Brittle Creeping Fault Zone:
Ductile Shear Zone
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Frictional sliding Ductile Shear
F: Driving Force (assumed constant)Ffr : Frictional resistanceF: Viscous resistance to
A simplified springs and sliders model
F
F = Ffr + F
F < Ffr No slip
F > Ffr Stick-slip
a-b<0
(Perfettini and Avouac, 2004b)
a-b>0
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Stress transfer during the seismic cycle
F : Driving Force (assumed constant)Ffr : Co-seismic drop of frictional resistanceF: Viscous resistance
F >> Ffr
F Ffr
(Perfettini and Avouac, 2004b)
Two characteristic times are governing the temporal evolution of deformation
- Brittle creep relaxation time tr- Maxell time TM
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(Perfettini et al, 2005)
Interseismic displacement at AREQ relative to stable South America is landward.
The persistent seaward motion of AREQ after the earthquake is due to postseismic relaxation.
The modeling suggest that may be interseismic is never really stationary
Displacement at AREQ relative to stable South America before and after the Mw 8.1, 2001, Arequipa earthquake.
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References
Cohen, S. C. (1999), Numerical models of crustal deformation in seismic zones, Adv. Geophys., 41, 134-231.
Wang, K, Elastic and Viscoelastic Models of Crustal Deformation in Subduction Earthquake Cycles, In The Seismogenic Zone of Subduction Thrust Faults, edited by T. Dixon and J. C. Moore, Columbia University Press, 2007 .
Cattin, R., and J. P. Avouac (2000), Modeling mountain building and the seismic cycle in the Himalaya of Nepal, Journal of Geophysical Research-Solid Earth, 105(B6), 13389-13407.
Wang, K. L., J. H. He, H. Dragert, and T. S. James (2001), Three-dimensional viscoelastic interseismic deformation model for the Cascadia subduction zone, Earth Planets and Space, 53(4), 295-306.
Hu, Y., K. Wang, J. He, J. Klotz, and G. Khazaradze (2004), Three-dimensional viscoelastic finite element model for postseismic deformation of the great 1960 Chile earthquake, Journal of Geophysical Research-Solid Earth, 109(B12).
Perfettini, H., and J. P. Avouac (2004), Stress transfer and strain rate variations during the seismic cycle, Journal of Geophysical Research-Solid Earth, 109(B6).