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Near-field strong ground-motion data from the September 12-13, 2007 Sumatra sequence

Near-field strong ground-motion data from the September 12-13, 2007 Sumatra sequence. Preliminary report by Hudnut, K., C. Stephens, D. Boore, J. Galetzka, A. Acosta, J. Genrich, K. Sieh, J.-P. Avouac, R. Briggs, A. Borsa and K. Stark Caltech Tectonics Observatory Sumatra Meeting

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Near-field strong ground-motion data from the September 12-13, 2007 Sumatra sequence

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  1. Near-field strong ground-motion data from the September 12-13, 2007 Sumatra sequence Preliminary report byHudnut, K., C. Stephens, D. Boore, J. Galetzka, A. Acosta, J. Genrich, K. Sieh, J.-P. Avouac, R. Briggs, A. Borsa and K. Stark Caltech Tectonics Observatory Sumatra Meeting Pasadena, California October 3, 2007

  2. Acknowledgements • Caltech Tectonics Observatory • Prof. Jean-Philippe Avouac, Director • Prof. Kerry Sieh; Sumatra Lead • Jeff Genrich, John Galetzka, Rich Briggs, Aron Meltzner, Ozgun Konca, Anthony Sladen, Willy Amidon, Keith Stark (consultant) • LIPI • Danny Natawidjaja • UCSD/SOPAC • Linette Prawirodirjo, Peng Fang, Yehuda Bock • U. S. Geological Survey • Walter Mooney, IOTWS Lead for USGS • Ron Porcella, Arnie Acosta, Chris Stephens, Dave Boore, Roger Borcherdt, Shane Detweiler, Woody Savage, Mehmet Celebi, Adrian Borsa

  3. Historic rupture zones - 1797 & 1833

  4. Engineering seismology Earthquakes <600 km from Jakarta, Singapore, and Kuala Lumpur PADANG - tsunami threat JAKARTA

  5. Station locations

  6. Pulau Sikuai - PSKI From Chris Stephens, USGS Menlo Park For the Mw 8.4 at 392 km: PGA horiz. of 55.97 cm/s2 ; ~6% g (not ‘huge’) PGV 5.9 cm/s horiz. ; -3.5 cm/s vert. For the Mw 7.9 at 165 km: PGA horiz. of 168.4 cm/s2 ; ~17.2% g (still not ‘huge’) PGV 11.3 cm/s horiz. ; -6.8 cm/s vert. Long-Period Energy? Directivity effects?

  7. Preliminary finite-fault source modelsProf. Chen Ji, UCSB - M 8.4 & Yuehua Zeng, USGS - M 7.9 Thanks to Rich Briggs for the KML files!

  8. PSKI - Event 1 - Mw 8.4 Velocity records for the Mw 8.4 (by Dave Boore)

  9. ShakeMap Ground-Motion Prediction PGV: ~10 cm/s at Padang (computed) 6.9 cm/s (observed) Automated - based on Wald et al. (2005) and finite-fault source model by Chen Ji

  10. PSKI - Event 2 - Mw 7.9 Velocity records for the Mw 7.9 (by Dave Boore)

  11. PSKI photograph Courtesy of John Galetzka; Caltech Tectonics Observatory Enclosure and solar array act as an inverted pendulum at 3-10 Hz

  12. Silabu (SLBU) station photos Courtesy of John Galetzka; Caltech Tectonics Observatory Much closer than PSKI ! Data received from JEG yesterday (10/2) • Chris Stephens set to work on it immediately • Data from M 8.4 - P-wave seems to be missing • Data from M 7.9 - record also appears truncated • Still evaluating data - initial plots last night (10/2) Enganno data not yet retrieved from field.

  13. SLBU Waveforms for the Mw 8.4 (by Chris Stephens)

  14. SLBU Velocity for Mw 8.4 ~80 cm/sec broad pulse

  15. SLBU Displacement for Mw 8.4 Need to check this with GPS displacement vectors

  16. SLBU Spliced record for the Mw 7.9 (by Chris Stephens) Three pulses of energy - Burst 1 @ 5-25 sec Burst 2 @ 35-60 sec Burst 3 @ 70-90 sec 1 2 3

  17. Data processing, archiving & distribution http://www.strongmotioncenter.org/ Chris Stephens, USGS NSMP Data Center & NCESMD partnership http://nsmp.wr.usgs.gov/

  18. Backup Slides

  19. Sequence Overview

  20. PSKI - Event 1 - Mw 8.4 Waveforms for the Mw 8.4 (by Chris Stephens)

  21. PSKI - Event 2 - Mw 7.9 Waveforms for the Mw 7.9 (by Chris Stephens)

  22. PSKI - Event 3 - Mw 7.0 Waveforms for the Mw 7.0 (by Chris Stephens)

  23. PSKI - Event 3 - Mw 7.0 Waveforms for the Mw 7.0 (by Dave Boore)

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