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NGA Dataset - Preliminary Data Analysis: Final NGA Data Set with 62 Earthquakes

This dataset includes finite fault models for 62 earthquakes, source scaling, NGA site data, and recordings from over 1600 strong-motion stations. It provides valuable information for preliminary data analysis and research purposes.

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NGA Dataset - Preliminary Data Analysis: Final NGA Data Set with 62 Earthquakes

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  1. NGA Dataset Brian Chiou NGA Workshop July 19, 2004

  2. Version 1 - November 2003 • Version 2 – June 04, 2004 • Used for preliminary data analysis • Version 3 – August, 2004 • Final

  3. NGA Data Set • MasterEQ_V012 (include finite fault models for 62 earthquakes) • SourceScaling_ALL_V012 • NGA_Site_V017 • 060104.cat (catalog of recordings) • …… Flatfile

  4. Status of Data (07/15/2004) • 173 earthquakes • ~ 1600 strong-motion stations • 3547 recordings • 22 more records • 16 USGS records (Stevens and Boore, USGS), Loma Prieta • 3 records from Stone Canyon (Event 0139) • Hector, Hector Mine earthquake • Jensen Filter Plant Generator Bldg, Northridge earthquake • TCU088 of ChiChi

  5. Data Coverage • Pre-NGA • EQID: 1 – 127 (1994 Northridge) • Total number of recordings = 1079 • NGA • EQID: 1 – 175 • Total number of recordings = 3547 • Total number of ChiChi data = 1812

  6. Previous Data New EQ Data - Kobe - Kocaeli - ChiChi - Duzce - Hector Mine - Denali

  7. Histogram of Recordings - Distance

  8. Histogram of Recordings - Mw

  9. Data used for Extensional Regime

  10. Recent Improvement on Source-Path Metadata • Isochrone-directivity parameters (USGS Open File Report)

  11. Recent Improvement on Site Metadata • California/Nevada Review & revision of Geomatrix 3-letters classification (D. Wells, Geomatrix Consultants Inc.) • Alaska (Denali earthquake) • Geomatrix 3-letters classification (D. Wells, Geomatrix Consultants Inc.)

  12. Recent Improvement on Site Metadata • Vs30 • Taiwan (ChiChi and aftershocks) • Measured Vs30 at 125 Sites (NCREE’s P-S logging) • Geomatrix 3-letters classification (D. Wells, Geomatrix Consultants Inc.) • Inferred Vs30

  13. March, 2004 ChiChi & Aftershocks NEHRP-A NEHRP-B Category Missing NEHRP-C NEHRP-D NEHRP-E

  14. July, 2004 NEHRP-A NEHRP-B NEHRP-C NEHRP-D NEHRP-E

  15. Recent Improvement on Site Metadata • Basin depth information • Z1.5 = depth to the Vs=1.5km/sec isosurface • Bay Areas (J. Boatwright/USGS, Menlo Park) • Los Angels Areas, Imperial Valley, and Mendocino (Rob Graves, URS/John Stewart, UCLA)

  16. Development of Ground Motion Parameters • Strike-normal, strike-parallel, and vertical components • In progress (N. Abrahamson) • PGA, PGV & PGD from data provider • Uncorrected (Vol. 1) & corrected (Vol. 2) PGA (CGS/USGS)

  17. Recent Development of Ground Motion Metadata • A simple (and conservative) rule to determine lowest usable frequency for spectral accelerations • Based on several factors: filter type, corner frequency, instrument type • A more rigorous rule – D. Boore

  18. Schedule • Final release of NGA dataset: early August

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