910 



MISCELLANEOUS GEOPHYSICAL MP:TH0DS 



[Chap. 12 



Minerals 



the fold developed by Ethane 

 subsequent folding. In 

 all other cases reported 

 by McDermott (La 

 Rosa field, Refugio 

 County, Texas; Cedar 

 Lake field, Gaines 

 County, Texas; Monu- 

 ment field near Hobbs, 

 New Mexico; Riverside 

 area, Nueces County, 

 Texas ; Atlanta area, 

 Columbia County, Ar- 

 kansas; Coles-Levee, Ca- 

 nal, and Ten Section 

 fields in Kern County, 

 California; and the East 

 Texas field. Fig. 12-16), 

 the halo (in significant 

 gases, pseudohydrocar- 

 bons, and minerals) is 

 associated with a pro- 

 ducing area. Only halos 

 are described by Rosaire 

 for the Ramsey (Pajnie 

 County , Oklahoma) , 

 Griflfe (Gibson County, 

 Indiana), Hastings (Bra- 

 zoria County, Texas) , 

 Lopez (south Texas) and 

 Eureka (Harris County, 

 Texas) fields (see Fig. 12-15). 



2x10'*7. 



'':/:^>^^?:>777:^7>>r.^.r^ 



\ Midwaif 



Navarro 



I UpiMr Tayhr . 



Pecan 



latter 



v/^f\^//\<M>^->y->i'-'A ' <^w. 



S.L 



Cap 



TaifJor 



^odbj^,^^^ == == = 



f Texas Field 



Fig. 12-16. Variation of ethane, surface wax, liquid 

 pseudohydrocarbons, and mineralization near edge 

 of East Texas field (after McDermott). 



III. VIBRATION RECORDING, DYNAMIC TESTING, AND 

 STRAIN GAUGING 



The following section is concerned with various geophysical methods 

 which find application in structural, transportation, and mining engineer- 

 ing. Collectively, they constitute the major portion of the field of engi- 

 neering seismology which has as its main objective the reduction (if not 

 elimination) of the damage done to structures by earthquakes and indus- 

 trial vibrations. Most fruitful in this field has been the recognition that 



