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iShake : Mobile Phones as Seismic Sensors

iShake : Mobile Phones as Seismic Sensors. Shideh Dashti, Jack Reilly, Jonathan Bray, Alexandre Bayen , Steven Glaser, Ervasti Mari U.C. Berkeley Funded by the US Geological Survey under NEHRP Award G10AP00006 Acknowledgements: UC San Diego and UC Berkeley Shaking Table facilities

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iShake : Mobile Phones as Seismic Sensors

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  1. iShake: Mobile Phones as Seismic Sensors Shideh Dashti, Jack Reilly, Jonathan Bray, AlexandreBayen, Steven Glaser, ErvastiMari U.C. Berkeley Funded by the US Geological Survey under NEHRP Award G10AP00006 Acknowledgements: UC San Diego and UC Berkeley Shaking Table facilities Special thanks to Professor Mahin at UC Berkeley and Professor Hutchinson at UC San Diego

  2. Post-Earthquake Information “Did You Feel It?” or Community Internet Intensity Map (CIIM) ShakeMap M=7.2 Baja California EQ from USGS (2010)

  3. ? accuracy

  4. iShake Sensor Quality Evaluation Shaking Table Tests Testing of Phone Connections Systems Client Application Backend Server Field Tests Systems User Studies

  5. iShake Sensor Quality Evaluation Shaking Table Tests Testing of Phone Connections Systems Client Application Backend Server Field Tests Systems User Studies

  6. Shaking Table Tests

  7. Input Ground Motions 5% Damping Spectral Acceleration (g) Arias Intensity(m/s) Time (s) Period (s)

  8. Application Software

  9. Results: Stationary Phones Acceleration (g) Fourier Accel. (cm/s) Reference iPhone Time (s) Frequency (Hz)

  10. Results: Stationary Phones Velocity (cm/s) Displacement (cm) Reference iPhone Time (s) Time (s)

  11. Response Spectra 5% Damping Spectral Acceleration (g) Frequency (Hz)

  12. Response Spectra Mean phone Reference 5% Damping Spectral Acceleration (g) Frequency (Hz)

  13. “Goodness of Fit” Bias (log(g)) Period (s)

  14. Quantifying Phone Error Normalized Prediction Error Peak Ground Accel. (g) Peak Ground Displacement (cm) NPE=MSE/PGA2 MSE

  15. Phones Allowed to Move Freely

  16. Shaking Table Tests

  17. Phones Allowed to Move with Cover Acceleration (g) Spectral Acceleration (g) Fourier Accel. Frequency (Hz) Frequency (Hz) Time (s)

  18. Phone Allowed to Fall Reference Falling Phone Falling Phone X-Direction Reference Arias Intensity (m/s) Y-Direction Acceleration (g) Z-Direction Time (s)

  19. accuracy

  20. accuracy

  21. iShake Application http://ishakeberkeley.appspot.com

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