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I Carder D Sflsmic Inv$ l hta t ions In the Boulder Dam ArfA tJUO-HI H lUld the ill ll uelu c or Rfigtcn olr lOa d ln g (1) 1o( 1 E a rlhq ua lte AcivHy Ou l Selllll middotu( Ant 3amp 17 j-1 9l t HI4e )

2 RIIhu C Elemcntary Sdsmology FrCP lTlan CO t San Frunchco ( 1 UfgtM)

3 OOIlU1 D Gl r hYWi Cal intUIIJ~tlons at Lak e l~art l)a dnterT Symp uber r ~ [lI P rt1 knLHt lnIJlw~~ungtnt Uerlln IVGt

~ Berg E Trilij(l rhll of ttl euro Itl k(ln Earthqtl3k r or Murch ~LII 1164 and m Ljor arttJ1illoClu by luw OCt(lfi tlll ( loa ds Ulldated reporl to A i r FOret oRl el or iCHl t Rc~ (t lfi d)

5 Jaeger J and L ttltd ~ ~midty Of Soo lh~at t Australia Am Geoph Unbull Monograph 13 pp JIo 5-14 7 (I fiG) )

6 Gaianorotoa L n)~ IntJu cl1ee lf the FluClunU uD Or Mara ll tCl- n Lake I~Wl l ln OIL Local 1~ (jj t11quakc Allh ily III lh~ AUk Basin Alea Alili (fOI c1 eti P1H6 H t lmiddot 18 28 1-306 (USS)

1 Coloi P L((lfi1o del VaJont nci suol AspeUl GeodynamiC Ann dl GeMbull I ~ t (1 966 )

8 Evans D Man~ lT1ade earlhquakes In D envcr IG tlVUmeso 10 pp11-18 (1960)

9 Conminaltil P D rtdroPGIIJa J ilfoumoulidu G mld D Pdt-shywdl() Fortshock ltIu d nfter1lhoc k sequences or lbe CrtJUJJla

earlhqut lt anll t1eir rtla tlOn 10 thc water loadIng or the Cnshymasta artific ial la ke Ann dl Gror 21 39~71 (1968)

to Guha S Ram G and G Rao TrIgger Cau$I In Eart h JfQvampshymenls Pu bl Dur G(lnt Sci sm IIlI~ iiI Tra SCi 9 ts3~ (1 956)

II Me Gl lIlis L F middotlrl hquakcs and CmsLa I ~[o cment AS lteJalc4 t o water LI)a i ll th e )J isslllil)Pi Valley nq~iu n llIinolJJ SL GI() I Survey rUu13 ( 19 G3)

12 Mo luulwa T Study o EartllQULIi~s ltTokyo U no S holto ( t 064 )

13 EuaJl$ D Th~ I lrnl1 arC(l ea rth(IUak CI and t h Rod )l o UR-lt lain Arsenal ltlj~poslll well Thf Mount ai n G~ ()i OShil a - fU (1966)

14 RolM J EarthquaJolti ~nd re crvor loadings Proc 4th orl(J Couf on Earth En lr Chile (1969)

15 fjnIf]7noTl P StlLd lrfI ill largePlast c Flow IUI limiddotr4l I Llr~ ~j t Gruw Hili Jook Co (19~2)

912

Reservoir Loading and Local Seismicity Iy J Drakopouloamiddot

Summary

R ecent earthquake activities atlributed to artificial unmiddot balance of na tural fOlC(S in various loca lities havo rrvived intmr~t ill inv(sligatiorr for a correlation between the seishysmicity of a Cfrtain regio n and tho ratc or change of water loading in a dam (If the region Seismic activity and resershyvoir loading in some areas support the ca s r~ No signifka nt

jn(rease or seismic activity was observed in some other darns

Th e explanation of the whole phenomenon it seems to be complex lnd in this paper arc included some interesting points flom the international Iit()rature and the opinion of the au th or lor a beller understanding of this prohable cort liation

bull Degrep in Pbyslet (nd B Irtl ronrJi Un i v~l y or At h~II D ocwr Fore and After~ho c li s Mlcrotremors and )flcroearthqlake~ Co~

degref in Iilmolog) ( 1Hll ) Chler Ol ~sl ii -alll In S eiilil La i) ll ralory o r Manlgur of the lr()j~L (If UNE~ 0 ~ur ey or the SciMnl cHy in tbe Ath ens Ull hrrsil ) 1 169~ J1l In Ail Hlc e Cnurtt o r t mNll ali ullal Inshy BalKan region bull Mlmbfr In l nlpoundrn ational AssociatlonH Parllclpant S tl tUtl~ of seil lll otofff HIII E alth ilu a k~ En~III~rl rll ReStlre work In SOlfle Interna tion al COnrerell~ In SeismiCity lUsl liI l St rut ture of Ule Eart h Ioc al Mechanlsm