瞬变电磁法基本原理

7291956``}.、(212008)。Wati9151,1953。1960,(MPPO);1962,MelaughlinDolan、,1964197。,。,,。,;,,。。:,,:;:。1。、。,,、。,1,,。,,(1)。,,2。7,。;,,。3,,_。(Faarday),,,。,,,(GrantandWest1965,Weaver,1970),。,(4),,。,,,,(2)。、。,。。1,、(5),MolI。11,RL。I。(t),,:MS23⑧(a)(b)(c)4.e0()[11(t)=oMlloLt)O(1)(GrantandWest,1965),:=L/I。(1),5!2:。t。,,:I,(o)-oMlloL,(Moll。)(L),(1/R)。,,:e,(t)=M12al,(t)atMolMl,____=In=}J(t)et/r]t)O(2)6:S(t)。(2),,:,,;,,:,,(6)。。2,(),。,,。。33.1lEa,78。。,lEa、,20om,120m,410m,100m。3.29。,,;。aB(t)dt(PVA)1850202250245026502850E///l。。}“`7ELVRA(Bvselli1950)867155199002050521220503252045025556200257OE!11-「1〔ms)O50_91.3l7.。、。121112!3(1312512213020nmō,r,J,`o\201201261213`J31442l263.4425058708.5}0.}}{71471.6141~-~-~---~~~-~15581118048216917318l!601,!.:.;324567591012131416158ELVRA(Buselli1980)081.2`6I,L,`,J(1115)42,/,L.nnrJ」7086{02255075100125}50}75200JJJ9(Henderson,1986)。。3.310。lo4om,。2:87,;,。,。,,100。nnù200I200}00500000000rrrwe..l~I-———.、、JTrrres,l、_____n.-~sessse——`;;;,,,,.`0LJJJJJJJ50ǎ·Uà}O}0.O30Q.m}001000(ms)180·m0”ǎàù501350。mǎà30n。mO13n。m10(Henderson1986)1Grant,F.Sandwest,G.F.,1965,Interpretationtheoryinapplirdgeophysies:MeGrawHill,NewYork.2Jing,E1995,Modellingeleetromagnetieresponsesof3Dearthstruetures:ph.D.thesis,UniversityofMelbourne.3Nabighian,M.N.andMaenae,J.C.,1991,Timedomaineleetromagnetieprospeetingmethods,inNabighi-an,M.N.,Ed.,Eleetonagneriemethodsinappliedgeophysies,vol.2:InvestigationeinGeophysies,Soe.Expl.Geophys.,4275204Wait,J.R195lla,TransienteleetromagnetiePropagationinaeonduetingmebium:Geophysies,16,213221.5Weaver,J.T1970,Thegeneraltheory’ofEMduetioninaeonduetinghalfspaee:Geophys.J.Roy.Autr.Soe.,22,82100.