1 / 28

Brian Chiou NGA Workshop #5 March 24, 2004

NGA Dataset. Brian Chiou NGA Workshop #5 March 24, 2004. NGA data released on November 2003 Accomplishments since November 2003 Schedule for the 2 nd release. Data Released (11/15/2003). 172 earthquakes ~ 1600 strong-motion stations

kenyon
Télécharger la présentation

Brian Chiou NGA Workshop #5 March 24, 2004

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NGA Dataset Brian Chiou NGA Workshop #5 March 24, 2004

  2. NGA data released on November 2003 • Accomplishments since November 2003 • Schedule for the 2nd release

  3. Data Released (11/15/2003) • 172 earthquakes • ~ 1600 strong-motion stations • Information of earthquakes and stations (metadata) (compiled by PE&A) • MasterEQ_V009 (include finite fault models for 62 earthquakes) • SourceScaling_ALL_V008 • NGA_Site_V015 • 101503.cat (catalog of recordings)

  4. Data Released (11/15/2003) • A total of 3524 recordings • ~ 7,000 (horizontal) response spectra files • Data flatfile (Version 1) • 85 columns of metadata • 102 columns of ground-motion parameters • PGA, PGV, PGD • LP, HP • 5%-damped pseudo spectral accelerations (0.01sec to 10 sec) (97 periods)

  5. Improved Data Coverage • Pre-NGA • EQID: 1 – 127 (1994 Northridge) • Total number of recordings = 1079 • NGA • EQID: 1 – 175 • Total number of recordings = 3524 • 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. ChiChi & Aftershocks NEHRP-A NEHRP-B Category Missing NEHRP-C NEHRP-D NEHRP-E

  10. Data used for Extensional Regime

  11. Strike-Slip Earthquakes Data in Somerville et al. 1997 NGA Dataset

  12. Improved Consistency • Closest Distance to Fault vs. Joyner-Boore Distance (Current PEER database)

  13. Improved Consistency • Closest Distance to Fault vs. Joyner-Boore Distance (NGA dataset)

  14. II. Accomplishments Since November 2003

  15. Reviews of Source-Path Metadata • PI: URS (Nancy Collins/Paul Somerville) • Progress (February 19, 2004) • Check calculations of distances • Completed; and they are computed correctly • Check calculations of directivity parameters • In progress • Review finite fault models used for calculations of distances and directivity parameters • In progress

  16. Reviews of Source-Path Metadata • Source-path metadata: URS (Nancy Collins/Paul Somerville) (continued) • Review earthquake magnitude and uncertainty • Check the component orientation and other station data • In progress

  17. Reviews of Site Metadata • PI: Donald Wells, Geomatrix • Check, for each station, • Station instrument setting classifications • Consistency between different site classifications • Update/Add site metadata • Data from Stewart/Yoojoong • Alaska stations data • Active Link to CISN Station Data web page (CISN EDC) for most CSMIP stations

  18. Evaluations of Ground-Motion Parameters • PI: Walt Silva/Bob Darragh/Nick Gregor (PE&A) • PEER-COSMOS joint working group meeting (March 17, 2004) • Meeting summary: next presentation

  19. Recent Work on Source-Path Metadata • Source-path metadata • Shallow vs. deep asperity event • Completed (Paul Somerville, URS) • For 18 earthquakes • Data for the isochrone-directivity model proposed by Spudich • In progress (PEER-LL) • Closest distance to the seismogenic portion of the rupture (as defined by Campbell) • In progress (PEER-LL)

  20. Recent Work on Source-Path Metadata • Slip rate of causative fault • Completed (by USGS/Golden) • For 21 California earthquakes • Slip rate used in seismic hazard mapping project

  21. Recent Work on Metadata • Basin depth information • N. Cal (USGS, Menlo Park) • In progress • Imperial Valley and Mendocino • Completed (Rob Graves, URS) • Shallow depth information (Bray’s definition) • Completed (Kevin Cohen, CGS)

  22. Recent Work on Site Metadata • Vs30 • California Strong Motion Sites • From SASW measurements at 60 sites (Rob Kayen, USGS) • Taiwan (ChiChi and aftershocks) • From SASW measurements at 38 Sites • 26 sites by Prof. Stokoe, UT; • 10 sites by Prof. Ni, NCKU, Taiwan • From P-S loggings at ~ 110 Sites (NCREE; Vs30 computed by Bob Nigbor, USC) • More 2002 drilling results

  23. Recent Work on Site Metadata • Alaska (Denali earthquake) • Donald Wells (Geomatrix)

  24. Recent Development of Ground Motion Parameters • Strike-normal, strike-parallel, and vertical components • In progress • Usable bandwidth for spectral accelerations • PEER • Data provider (CGS/USGS) • PGA, PGV & PGD from data provider • Uncorrected (Vol. 1) & corrected (Vol. 2) PGA (CGS/USGS) • Errata (PE&A)

  25. Schedule • Second release of NGA dataset: April 23

More Related