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

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Presentation transcript:

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

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

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) Three are listed in EQ_Master, but ground-motion parameters were not collected yet. These earthquakes are:

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 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

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

Histogram of Recordings - Distance

Histogram of Recordings - Mw

ChiChi & Aftershocks NEHRP-A NEHRP-B Category Missing NEHRP-C NEHRP-D NEHRP-E

Data used for Extensional Regime

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

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

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

II. Accomplishments Since November 2003

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

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 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 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 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)

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 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 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 Metadata Alaska (Denali earthquake) Donald Wells (Geomatrix)

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 Second release of NGA dataset: April 23