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Brian Chiou NGA Workshop #5 March 24, 2004 PowerPoint Presentation
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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

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slide1

NGA Dataset

Brian Chiou

NGA Workshop #5

March 24, 2004

slide2
NGA data released on November 2003
  • Accomplishments since November 2003
  • Schedule for the 2nd release
data released 11 15 2003
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)
data released 11 15 20034
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)
improved data coverage
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
slide9

Previous Data

New EQ Data

- Kobe

- Kocaeli

- ChiChi

- Duzce

- Hector Mine

- Denali

slide12

ChiChi & Aftershocks

NEHRP-A

NEHRP-B

Category

Missing

NEHRP-C

NEHRP-D

NEHRP-E

slide14

Strike-Slip Earthquakes

Data in Somerville et al. 1997

NGA Dataset

improved consistency
Improved Consistency
  • Closest Distance to Fault vs. Joyner-Boore Distance (Current PEER database)
improved consistency16
Improved Consistency
  • Closest Distance to Fault vs. Joyner-Boore Distance (NGA dataset)
reviews of source path metadata
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
reviews of source path metadata19
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
reviews of site metadata
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
evaluations of ground motion parameters
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
recent work on source path metadata
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)
recent work on source path metadata23
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
recent work on metadata
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)
recent work on site metadata
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
recent work on site metadata26
Recent Work on Site Metadata
  • Alaska (Denali earthquake)
    • Donald Wells (Geomatrix)
recent development of ground motion parameters
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)
schedule
Schedule
  • Second release of NGA dataset: April 23