Goals Learn to simulate dynamic rupture model Explore the effects - - PowerPoint PPT Presentation

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Goals Learn to simulate dynamic rupture model Explore the effects - - PowerPoint PPT Presentation

Jan 03, 2024 184 likes •603 views

Practice : dynamic rupture in 2D and 2.5D Huihui Weng Jean-Paul Ampuero Goals Learn to simulate dynamic rupture model Explore the effects of fault heterogeneities on dynamic ruptures Discussion: seismology problems 2D and 2.5D

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Practice:

dynamic rupture in 2D and 2.5D

Huihui Weng Jean-Paul Ampuero

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Goals

  • Learn to simulate dynamic rupture model
  • Explore the effects of fault heterogeneities
  • n dynamic ruptures
  • Discussion: seismology problems
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2D and 2.5D numerical codes

Download from GitHub

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2D and 2.5D numerical codes

Download from GitHub

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MATLAB code semlab

  • ---- run it directly

Fortran code sem2dpack

  • ---- installation is simple
  • ---- simulation is fast
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Model parameters

Frictional fault LY LX or LX/2 Discretized size S wave speed Density

Static friction coeffjcient Dynamic friction coeffjcient Normal stress Shear stress Slip-weakening distance

τ Slip τ0 τs τd Dc

Stations

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Seismogenic width W

x2 x1 x3

Slip profile

Seismogenic width W

Aseismic region Aseismic region Aseismic region Aseismic region

Sin(k3x3)

(3 equations) Reduce to 1 equation

Slip approximation

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Tutorial of sem2dpack Tutorial of semlab

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cd ${work_dir}/semlab-master/SEMLAB matlab &

  • pen this file from matlab:

sem2d_eq_dyn_tutorial.m

How to run semlab?

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Parameter setup in semlab

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Result presentation (figure1)

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Result presentation (figure2)

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Result presentation (figure3)

Tip Cohesive tail Stopping phase Stopping phase

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Result presentation (figure3)

Tip Cohesive tail Stopping phase Stopping phase

Slip Slip rate Stress Tail of cohesive zone Tip

Definition of tip: Slip rate > threshold Definition of cohesive tail: Slip = Dc

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Result presentation (figure4)

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STF and its spectrum (final)

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STF and spectra

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Add a heterogeneity

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STF comparison

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Models to test

Uniform fault Barrier

Model 1

Uniform fault Barrier

Model 2

abrupt stop Rough fault Barrier

Model 3

abrupt stop gradually stop

Ø Heterogeneity can be initial stress or Dc Ø Question: what are the differences of STF and spectrum? Ø Discussion: what are the differences between 2D and 2.5D models?

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Discussion

Uniform fault Barrier

Model 1

Uniform fault Barrier

Model 2

abrupt stop Rough fault Barrier

Model 3

abrupt stop gradually stop

Ø model 1 vs. model 2 Ø model 1 vs. model 3 Ø 2D vs. 2.5D

Apple to apple

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Discussion

Ø model 1 vs. model 2

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Discussion

Ø model 1 vs. model 3

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Discussion

Ø 2D vs. 2.5D

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Models to test

Ø Heterogeneity is initial stress Ø Question: do these heterogeneities increase high-frequency radiation? Ø Discussion: what parameters may control the high- frequency radiation?

Uniform fault

Model 4

Uniform fault

Model 5

Previous ruptured region Steps Initial stress Dc

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Discussion

Ø model 1 vs. model 4 Ø model 1 vs. model 5 Ø 2D vs. 2.5D

Apple to apple

Uniform fault

Model 4

Uniform fault

Model 5

Previous ruptured region Steps Initial stress Dc

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Discussion

Ø model 1 vs. model 4

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Discussion

Ø model 1 vs. model 5

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Tutorial of sem2dpack Tutorial of SEMLAB

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Installation of sem2dpack

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cd ${work_dir}/sem2dpack- 25D/EXAMPLES/2.5D_inplane

  • pen this file by vim or other method:

vi Par.inp

How to run sem2dpack?

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Parameter setup in sem2dpack

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Parameter setup in sem2dpack

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cd ${work_dir}/sem2dpack-25D/POST

  • pen the script by MATLAB:

create_movie.m run it by MATLAB

How to present results?

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Discussion

ØFind seismic phases, such as P wave front, S wave, Rayleigh wave, etc. ØWhat parameters may control the formation of supershear rupture?

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