Mueller ppt3 eqk statistics - USGS Earthquake Hazard Program · Mueller_ppt3_eqk_statistics.ppt...
Transcript of Mueller ppt3 eqk statistics - USGS Earthquake Hazard Program · Mueller_ppt3_eqk_statistics.ppt...
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Catalog Statistics
C. Mueller, USGS
NSHMP Workshop, Memphis, Feb 2012
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For Catalog Comparisons…
1700-2006
Gardner & Knopoff decluster
exclude Charlevoix & New MadridUSGS/NSHMP catalog: mb-based
CEUS-SSC catalog: MW-based
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2008 USGS mb catalog
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1935 1886
USGS catalog (xcv,xnm)
Rate mb ≥ 5: fit = 0.31 /yr (Weichert) catalog = 0.28 /yr (44 eqks 1850-2006)(fit = 0.15 /yr for mb ≥ 5.3 or ~ Mw ≥ 5)
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CEUS-SSC catalog (xcv,xnm)(declustered with G&K)
1732(mb5.8), 1755(mb5.8),1895(NM), 1935
1886
Rate Mw ≥ 5: fit = 0.137 /yr (Weichert) catalog = 0.16 /yr (33 eqks 1800-2006)
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Explore finer-‐scale completeness & b value zona5on
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Seven completeness & b valuetest zones generalized from CEUS-SSC
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CEUS completeness zone #3CEUS-SSC Mw catalog (G&K) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.01701-10 2 0 0 0 0 0 0 01711-20 1 0 0 0 0 0 0 01721-30 2 0 0 0 0 0 0 01731-40 2 0 0 0 1 0 0 01741-50 1 1 0 1 0 0 0 01751-60 4 1 0 0 0 0 0 01761-70 0 1 1 1 0 0 0 01771-80 1 1 0 0 0 0 0 01781-90 2 0 0 0 1 0 0 01791-00 7 0 1 2 0 0 0 01801-10 7 0 0 0 0 0 0 01811-20 1 1 0 1 0 0 0 01821-30 5 1 1 0 0 0 0 01831-40 6 1 2 0 0 0 0 01841-50 3 1 3 1 0 0 0 01851-60 4 4 1 0 0 0 0 01861-70 1 4 0 0 0 0 0 01871-80 0 7 2 0 0 0 0 01881-90 6 9 2 0 1 0 0 01891-00 18 9 2 2 0 0 0 01901-10 8 1 1 0 0 0 0 01911-20 4 0 0 0 0 0 0 01921-30 14 3 2 0 0 0 0 01931-40 12 4 1 1 0 0 0 01941-50 9 4 2 0 0 0 0 01951-60 9 5 1 0 0 0 0 01961-70 5 8 2 0 0 0 0 01971-80 28 12 1 0 0 0 0 01981-90 20 2 2 1 0 0 0 01991-00 26 4 0 0 0 0 0 02001-06 5 1 0 0 0 0 0 0
?
Unstable completeness levels: dueto mixed source catalogs?
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Completeness year: MW 2.5
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Completeness year: MW 3.0
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Completeness year: MW 3.5
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Completeness year: MW 4.0
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b value
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Rates Mw ≥ 5 per zone:
model = 0.145 /yr (sum these 7 rates)
catalog = 0.16 /yr (33 eqks 1800-2006)
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Model rates normalized by area(MW ≥ 5 /yr /108km2)
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b = 1.003
b = 1.166
Is finer zonation better … ?
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Charlevoix
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New Madrid