2/14/18 1 CHARACTERIZATION OF GROUND RESPONSE TO SHAKING (15) I Main Topics (see USGS Professional Paper 1360) A Ground Response "EquaNons" B Linear response of ground C Use of shear wave velocity as a predictor of shaking D Frequency-dependent effects 2/14/18 GG303 1 II Ground response Ground response = f(source strength, path, "receiver") A EquaNons are empirical but intended to capture physics B EquaNon of Joyner and Boore (PP 1360: p. 204) for 5.0 ≤ M w ≤7.7 log y = c 0 +c 1 (M w -6) + c 2 (M w -6) 2 +c 3 logr + c 4 r+S y = ground-moNon parameter c x = frequency-dependent constants M w = Moment magnitude r = (d 2 +h 2 ) 1/2 : d = dist. from surface trace of fault; h = pseudodepth S = 0 (rock sites); S = c 6 log (V shear /V 0 ) (soil sites) 2/14/18 GG303 2
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II Ground response · CHARACTERIZATION OF GROUND RESPONSE TO SHAKING (15) I Main Topics (see USGS Professional Paper 1360) A Ground Response "Equaons" B Linear response of ground
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2/14/18
1
CHARACTERIZATIONOFGROUNDRESPONSETOSHAKING(15)
I MainTopics(seeUSGSProfessionalPaper1360)
A GroundResponse"EquaNons"B LinearresponseofgroundC Useofshearwavevelocityasapredictorofshaking
D Frequency-dependenteffects
2/14/18 GG303 1
II GroundresponseGroundresponse=f(sourcestrength,path,"receiver")
A EquaNonsareempiricalbutintendedtocapturephysics
B EquaNonofJoynerandBoore(PP1360:p.204)for5.0≤Mw≤7.7logy=c0+c1(Mw-6)+c2(Mw-6)2+c3logr+c4r+S
B GroundresponsetoarNficialsources(e.g.,Vibroseis,explosives)usedtopredictresponsetoseismicwaves(Eventhoughstrainsfromblastsaretwoordersofmagnitudeorsolessthanforearthquakes)
C GroundresponsetoliklequakesÞgroundresponsetolargequakes
D LinearresponsenotadequatetotreatliquefacNonphenomena;thenear-epicenterresponsetolargequakesisnonlinear.