Www.spice-rtn.org SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Seismic wave Propagation and Imaging in Complex media: a European.

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Presentation transcript:

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Seismic wave Propagation and Imaging in Complex media: a European network Shane Murphy Early Stage Researcher Host Institution: University of Naples Place of Origin: Dublin, Ireland Appointment Time: January 2005 Project: Earthquake scaling with initial rupture phase Task Groups: TG Local Scale, TG Small Scale Cooperation: INGV Rome Shane Murphy Early Stage Researcher Host Institution: University of Naples Place of Origin: Dublin, Ireland Appointment Time: January 2005 Project: Earthquake scaling with initial rupture phase Task Groups: TG Local Scale, TG Small Scale Cooperation: INGV Rome

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Introduction After: Olsen & Allen (2005) Scaling of frequency with magnitude size

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Introduction From Zollo, Lancieri & Nielsen (submitted) Scaling of peak motion with magnitude size

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Theory Looking at the far displacement for a double couple point source…… u   ∆σ Λ u(t) Λ

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Theory Looking at shear fracture exclusively…… Energy Flow:   yy oo rr

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Theory In the case of the Antiplane Stress Intensity Factor Steady state pulseKostrov crack Self-similar pulse The Stress Intensity, K, always depends on the Sqrt( Λ ) & ∆σ

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Theory Combining the two equations …… Energy Flow: u   G e ∆σ Λ∆σ Λ

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Graphical Depiction of Model b a y Triggering patch Asperity background R1 R2 L σ σ σ

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland The model Fault plane Triggering patch High-stress asperity Background stress Final rupture size?

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland The model Fault plane High-stress asperity Background stress Final rupture size? M o ini MoMo

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland The model

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland The model sliprate Model Parameters: Trigger Radius: 10 Asperity Radius: 20 Yield Stress: 1.2 Asperity Stress: 0.8 Background Stress: 0.6

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Results Rupture Length Versus Moment Rate Moment Rate

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Results Moment Rate (Far Field Displacement) Moment rate (far field displacement) Peak Mo.rate (R2) Start healing Fracture stops Time

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Results Scaling of Magnitude with Moment Rate

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Problem – Slip Distribution Slip Pattern Unphysical as nucleation usually found outside zone of major slip slip slip yy yy

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland Future Work Different model types Moving Nucleation Location Heterogeneous Stress Distribution Rupture Time History Synthetic Seismograms P - arrival

SPICE Research and Training Workshop III, July 22-28, Kinsale, Ireland The End Thank you