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Earthquake Early warning and possible precursor from seismicity

By NTU Palert , CWB & NCDR teams. Earthquake Early warning and possible precursor from seismicity. Wu and Chiao (2006). Background 1994 to Chi-Chi M>=2.0 Radius 20 km Depth <= 40 km. Background 1994 to 2003/12/09 M>=Mc B value (Aki) Radius 25 km Depth <= 35 km Relocated catalog

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Earthquake Early warning and possible precursor from seismicity

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  1. By NTU Palert, CWB & NCDR teams Earthquake Early warning and possible precursor from seismicity

  2. Wu and Chiao (2006)

  3. Background 1994 to Chi-Chi M>=2.0 Radius 20 km Depth <= 40 km

  4. Background 1994 to 2003/12/09 M>=Mc B value (Aki) Radius 25 km Depth <= 35 km Relocated catalog Wu et al. (2008)

  5. Chan et al. (2012)

  6. Palert EEW

  7. For both onsite & regional early warning purposes

  8. iTouch for backup power (4 hrs), display and sound warning

  9. 345 stations

  10. CWB and Palert real-time strong motion stations

  11. CWBSN & Palert Shaking maps

  12. Grid setting • Use 5 km as grid spacing and useinverse square distance as weighting factor to calculate each point PGA. • One point represents 25 square km area.

  13. Case 1 22 38 8

  14. Case 2 20 8 40

  15. Thanks for your attention

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