PEER NGA-WEST2 DATABASE

PEER NGA-WEST2 DATABASE SWUS GMC SSHAC WORKSHOP #1 March 19-21, 2013 Oakland, California Robert B. Darragh Pacific Engineering & Analysis 1 PEER NG...
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PEER NGA-WEST2 DATABASE SWUS GMC SSHAC WORKSHOP #1 March 19-21, 2013 Oakland, California

Robert B. Darragh Pacific Engineering & Analysis 1

PEER NGA-West2 Database

Timothy D. Ancheta Pacific Earthquake Engineering Research Center Robert Darragh Pacific Engineering and Analysis, Inc. Jonathan P. Stewart Emel Seyhan University of California, Los Angeles Walter Silva Pacific Engineering and Analysis, Inc. Brian Chiou California Department of Transporation Katie Wooddell Pacific Gas & Electric, Inc. Robert Graves United States Geologic Survey Albert Kottke Pacific Earthquake Engineering Research Center David M. Boore United States Geologic Survey Tadahiro Kishida Pacific Earthquake Engineering Research Center Jennifer L. Donahue Geosyntec Consultants PEER Report 2013/01

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PEER NGA-West 2 ● 21192 three-component records ● 599 shallow crustal events ● Small-to-moderate magnitude (CA) ● M from 3 to 7.9 ● Rrup from 0.05 to 1533 km. ● Vs30 from 94 to 2100 m/sec. 3

Map of the epicentral distribution of the 335 selected worldwide events included in the NGA-West2 database. Open circles (blue) are events in the previous NGA-West1 database and solid stars (red) are events added in the NGA-West2 database. 4

Hypocenter Locations of the 276 events selected in the SMM data set. Boundary separates the NCSN from SCSN. Events to the north (blue) of boundary preferred metadata from NCSN\BDSN. Events to the south of boundary(red) preferred metadata from SCSN\CIT. 5

Magnitude-distance distribution of strong-motion records in the NGA-West2 database. Open blue squares are stations included in the NGA-West1. Solid red squares are stations added from worldwide events. Orange triangles are stations added from California only from small-to-moderate magnitude events.

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Highest useable period versus period using records included in both NGA-West1 (dashed black) and West-2 (solid red). The NGAWest2 database more than doubles the size of the previous NGA 7 database for moderate-to-large magnitude events M > 6 .

Comparison of the period set used in the NGA-West1project and the NGA-West2 project. Red triangles along the NGA-West2 line represent new periods added. The red triangle along the NGAWest1 line represents a period removed. 8

Pie-charts of station numbers in 2006 and 2013 site database for 5 main regions. CH: China, JP: Japan, Med: Mediterranean, TW: Taiwan, WNA: Western North America (i.e., mostly California).

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Histograms of measured and inferred Vs30 at the recording station sites in both the 2006 and 2013 site databases.

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Histogram of profile depth bins by region. Profile depths for Japan extend up to 365 m, but are concentrated at 100m in the figure. Note that there is one station with zp = 82m in Japan. 11

-90 -120

-60 Normal

-150

-180 180

NormalOblique

NormalOblique

Strike-Slip

Strike-Slip

150

-30

ReverseOblique

ReverseOblique

0

30

Reverse

120

60 90

Style of Faulting Classification based on Rake Angle 12

STYLE OF FAULTING Style

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