Mapping Coal witn Sound

Mapping Coal witn Sound

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~hesafetyandcostof-coalnrinlagDependheavilyon natural formations beneath the ds sui&ce. Until my, these
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ndd&h-d---h c~usedmanyd'broofcave-bthat dkillmioers.Geologicfaultstotheeartfa*~strataposesimilarm
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bytheoilindustryfordeepprobesof2^00to33,000f�§t,theU.S
BiireauafMiaesluBdevelfmeda~ewtedimQwfec&actiagsubstirfaoe
formationsiatbeafaallower,coal-beaxinfxbxta.
AccordingtaLeoperandRus/key*Bwewscientists,dietechnique
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Ã?Â¥MgitaliccorcUogayatein.AsmallexplosioniTr*-&-
micwavestfaroughtheearth,utbeam...

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