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

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 numerical codes Download from GitHub

MATLAB code semlab ----- run it directly Fortran code sem2dpack ----- installation is simple ----- simulation is fast

Model parameters LX or LX/2 Discretized size S wave speed Density LY Stations Static friction coe ffj cient τ Dynamic friction coe ffj cient Frictional fault Normal stress τ s Shear stress Slip-weakening distance τ 0 Dc τ d Slip

Seismogenic width W (3 equations) x 1 Reduce to 1 equation x 2 x 3 Aseismic region Aseismic region Sin(k 3 x 3 ) Slip profile Slip approximation Aseismic region Aseismic region Seismogenic width W

Tutorial of semlab Tutorial of sem2dpack

How to run semlab? cd ${work_dir}/semlab-master/SEMLAB matlab & open this file from matlab: sem2d_eq_dyn_tutorial.m

Parameter setup in semlab

Result presentation (figure1)

Result presentation (figure3) Cohesive tail Stopping phase Tip Stopping phase

Result presentation (figure3) Cohesive tail Stopping phase Tip Stopping phase Definition of tip: Slip Slip rate > threshold Slip rate Definition of cohesive tail: Stress Slip = Dc Tip Tail of cohesive zone

STF and its spectrum (final)

STF and spectra

Add a heterogeneity

STF comparison

Models to test Model 1 Uniform fault Barrier Ø Heterogeneity can be initial stress or Dc abrupt stop Ø Question: what are the Model 2 differences of STF and spectrum? Barrier Uniform fault Ø Discussion: what are the gradually stop differences between 2D and 2.5D models? Model 3 Rough fault Barrier abrupt stop

Discussion Apple to apple Model 1 Uniform fault Barrier Ø model 1 vs. model 2 abrupt stop Ø model 1 vs. model 3 Model 2 Barrier Uniform fault Ø 2D vs. 2.5D gradually stop Model 3 Rough fault Barrier abrupt stop

Discussion Ø model 1 vs. model 2

Discussion Ø 2D vs. 2.5D

Models to test Model 4 Ø Heterogeneity is initial stress Uniform fault Ø Question: do these heterogeneities increase Initial stress Previous ruptured region high-frequency radiation? Model 5 Ø Discussion: what parameters may control the high- Uniform fault frequency radiation? Dc Steps

Discussion Apple to apple Model 4 Ø model 1 vs. model 4 Uniform fault Initial stress Previous ruptured region Ø model 1 vs. model 5 Model 5 Ø 2D vs. 2.5D Uniform fault Dc Steps

Tutorial of SEMLAB Tutorial of sem2dpack

Installation of sem2dpack

How to run sem2dpack? cd ${work_dir}/sem2dpack- 25D/EXAMPLES/2.5D_inplane open this file by vim or other method: vi Par.inp

Parameter setup in sem2dpack

How to present results? cd ${work_dir}/sem2dpack-25D/POST open the script by MATLAB: create_movie.m run it by MATLAB

Discussion Ø Find seismic phases, such as P wave front, S wave, Rayleigh wave, etc. Ø What parameters may control the formation of supershear rupture?

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

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

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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Using Learning Goals to Inform Instruction Erin Meikle Overview What we mean by learning goals

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Goals The general goals of this presentation are to: Present a detailed discussion of

Building and Department Goals This presentation demonstrates the goals for all school sites

Presentation Tips Before You Start Understand your goals and the goals of your audience.

Mission, Goals, Metrics: Where Is CSCU Today? CSCU Mission &amp; Goals History BOR adopted the

S.E.T.F. Presentation www.barracudauae.com Vision Setting Goals is Easy, Achieving Goals and

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Multimessenger Study of the Universe Roger Blandford KIPAC Stanford (A personal perspective)

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