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Progress Report on Fling Processing

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).

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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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