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Progress Report on Fling Processing

This report presents findings from the NGA Workshop on Fling Processing, focusing on baseline correction techniques using Boore’s method. We discuss the implementation of a Sine-Pulse model with three parameters for accurately recovering residual displacement, highlighting its minimal effect on short time scales (T < 10 s). Critical analysis of simulated near-fault displacements emphasizes the importance of careful baseline correction. We provide solutions derived from numerical simulations to determine key parameters, including pulse period and start time, stressing the need for understanding physical constraints in modeling.

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Progress Report on Fling Processing

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  1. Progress Report on Fling Processing • Baseline correction Boore’s method (with judgement) • Fling model and removal Sine-Pulse model with 3 parameters • Minimal effect on SA (T < 10 s) NGA Workshop: Fling

  2. To model fling we need to accurately recover the residual displacement. Baseline correction of recorded motion is important step. t1: acc > 50 cm/sec2 t2(1): Boore v0 t2(2): acc < 50 cm/sec2 t2(3): 2 x t2(2) – t1 NGA Workshop: Fling

  3. Boore’s t2 tends to give reliable results • Unrealistic results omitted (by judgement) • Still non-unique (but little significance on fling removal) NGA Workshop: Fling

  4. Fix Tf (pulse period) using numerical simulations, then solve for t1 (start time) NGA Workshop: Fling

  5. Simulated Near-fault Displacements for Chi-Chi EQ Measure time between 10% and 90% of final displacement, adjust to sine pulse to determine Tf NGA Workshop: Fling

  6. Sine-pulse fit and corrected displacement for TCU052 (090) NGA Workshop: Fling

  7. Sine-pulse fit and corrected displacement for TCU068 (000) NGA Workshop: Fling

  8. Sine-pulse fit and corrected displacement for TCU068 (090) NGA Workshop: Fling

  9. Conclusions • Baseline correction must be done with care. • Sine-pulse model for fling provides time domain parameterization and can be related to underlying physical processes • - residual displacement (D): fault offset • - pulse period (Tf): slip rise time • Need to explore possible physical constraints on pulse start time (t1) • - S wave arrival? NGA Workshop: Fling

  10. NGA Workshop: Fling

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