Download
progress report on fling processing n.
Skip this Video
Loading SlideShow in 5 Seconds..
Progress Report on Fling Processing PowerPoint Presentation
Download Presentation
Progress Report on Fling Processing

Progress Report on Fling Processing

95 Vues Download Presentation
Télécharger la présentation

Progress Report on Fling Processing

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  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