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Real-time moment tensor and ground motion simulation

Real-time moment tensor and ground motion simulation. 李憲忠 中央研究院地球科學研究所. 0327 南投地震學術研討會 (2013/04/01). Outline. 0327 南投地震 - 斷層面解與震源機制 ? - 如何起始與破裂？ - 近場強地動之特性 ? - 遠場的地動之產生 ? - 地質背景之相關性 ?. Real-time Moment Tensor monitoring system (RMT) http://rmt.earth.sinica.edu.tw.

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Real-time moment tensor and ground motion simulation

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  1. Real-time moment tensor and ground motion simulation 李憲忠 中央研究院地球科學研究所 0327 南投地震學術研討會 (2013/04/01)

  2. Outline • 0327南投地震 - 斷層面解與震源機制? - 如何起始與破裂？ - 近場強地動之特性? - 遠場的地動之產生? - 地質背景之相關性?

  3. Real-time Moment Tensor monitoring system (RMT) http://rmt.earth.sinica.edu.tw

  4. RMT results: Mainshock

  5. CMT solutions BATS CWB GCMT USGS USGS RMT

  6. Fault plane (Strike 199°, Dip 56°, Rake 92°)

  7. Fault plane (Strike 14°, Dip 33°, Rake 86°)

  8. Teleseismic Data Band-pass filtered between 2-50 sec

  9. Teleseismic inversion Obs Syn

  10. Rupture process

  11. Slip Distribution Map view of slip projection Slip on the fault plane Depth (km) Distance (km)

  12. ShakeMovie • Real-time Online earthquake Simulation • http://ros.earth.sinica.edu.tw

  13. ShakeMap and Intensity Map • Real-time Computational Seismology earthquake report • http://rcs.earth.sinica.edu.tw

  14. Regional ShakeMovie

  15. Regional ShakeMap ShakeMap 上海 江西 福建 香港 Strong Weak

  16. Tectonic implication

  17. Tectonic implication

  18. Tectonic implication

  19. Tectonic implication Modified from Dr. Lin C. H. (BSSA, 2001)

  20. Summary • 斷層面解與震源機制? - Real-time moment tensor solution: Strike 14°, Dip 33°, Rake 86° - 逆衝斷層，斷層面朝東下傾

  21. Summary • 如何起始與破裂特性 - 初始破裂約在15~16公里 - 破裂主要朝深處發展 - 於16~22公里深處產生一個Asperity - 最大滑移量約20cm - 破裂持續約10秒

  22. Summary • 近場強地動之特性? - 由於逆衝斷層的作用，破裂能量主要朝震央西部傳遞 - 西部平原沉積層的震波放大作用造成台灣西部台中.彰化.雲林一帶產生較大之震度 • 遠場地動之產生? • - 逆衝斷層震源輻射型態，地震波的能量於震央東西兩側較強，造成大陸沿海城市如上海.廈門.香港等地感覺到明顯搖晃

  23. Summary • 0327南投地震之地質背景? - 北港高區的前緣 - 三義-埔里地震帶之東南端 - 脫曳構造的起始點

  24. 謝 謝 !Thank you

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