194A
the true attitude of planar features encountered in a length of oriented borehole core at the time the core is logged in the field. They also permit a direct quantitative assessment of the prominent sets of Joints emeountered. Auth.
Photographic techniques See also abstract: 1903 1924 CART~,WD Remote s ~ I n g and photogeology. In Spanish. Proc. 4th Venezuelan Geological Congress. DIR .GEOL.BOL.GEOL.PUBL. ESPEC IAL. CARACAS, V5, N5,1972, P2971-2973. 1925 MOFFITT,FH Photogra~metry. Textbook.-The principles and applications of this technique are studied. A detailed coverage of equipment, ground control and plotting is given. INT~TEXT PUBL.LTD.1972,5~0P. 1926 PREUSS,KD Numerical photogrammetry applied to measurements of rock Joints. In German. 5F,1T,4R. ROCK MECHANICS,SUPPL.3,JUNE,197~,PS-15 . This paper treats the photogrammetric determination of dlp-angle and azimuth of dip direction as a special case of terrestrial photogrammetry.
mediate strains) versus In (intermediate-minimum strains and is extended to apply to volume change. The applications of this means of rel~esentation are discussed.
1930 MARKLAND, J OVE ARUP AND P~RTNERs, iONDON, GB The analysis of principal co~9onents of orientation data.-Eigenanalysis is used to reduce data to principal components in problems concerning fracture orientation, stress-measurement etc. 5F, ST,1]~. INT .J.ROCK MECH .MIN. SCI .Vll,NS, MAY, 1974, P157-163.
1931 POPESCU, A An example of computer data processing and interpretation in underground measurements. In Russian. REV. MINEIDRV24, N7, JULY, 197B,P317-322 • The processing of data from load.yielding measurements on supports in longwall faces in No .B sesml Jiu Vs/ley is considered.
Subjects peripheral to rock mechanics 1932 MTT.Lk'~,JS WALK~, CJ E~KIN,JL Fracturing oil shale with explosives for in-situ oil recovery. 4OF. US BUR.MINES,RI 7874,1974,100F.
Geophysical techniques See also abstract: 18h5. 1927 TUCK~,PM YORSTON,HJ Pitf~]1~ in seismic interpretation. SOC .EXPLORATION GEOPHYS.TULSA,USA, MDNOGRAPH S~IES, N7,1973,50P. The authors classify seismic pitfalls into three groups: 1. related to velocity; 2. related to the geo~try of the reflectors; 3. related to the recording, processing and playback of the seismic data. The geoSogic phemomena which lead to each of these errors are presented and their origin is explained with the help of geologic models. Sidle validy tests for spotting these pitfalls are given.
1933 JACOBY, CH PAUL, DK Salt domes as a source of geothermal energy. 5F,BTR. MINING ~GINEERING, AIME,V26,N5,MAy, 1974, PB4-39.
1934 HEINZE,WD GOETZE, C Co~uter s4~,]ation of stresses in a polycrystalllne solid. Abstract. • 0S .TRANS . A ~ .GEOPHYS .UNION, V54, N4,1973, P450.
General geology See also abstracts: 1838,1889,1910,1926.
1928 AGUII~A, L GALOVICH,E Applications of geophysical methods in Venezuela to geotechnical studies. In Spanish. Proc .4th.Venezuelan Geological Congress. DIR .G~3L. BOL. GEOL. PUBL. ESPECIAL, CARACAS,V5 ,N5,1972,
P2912.
Presentation and interpretation of data 1929
OWENS, WH
UNIV.B IRMINGHAM, GB Representation of finite strain state by three axis planar diagrams. 6F,14R. GEOL. SOC .AM~q .BUI/~.V85,N2,FEB .1974,P307-310. Hsu's three axis representation of finite strain is compared with the more usual plot of In (maximum-inter_
1935 STANLEY, RS UNIV .V~RM3NT, BURLINGTON, USA Environment of deformation, MOD/~n qusrtzlte, ~elburne Bay, Western Vermont. 15F, 5T, BOR. GEOL.SOC. ~ME~.BULL .V85, N2, FEB. 197h, P233- 246. 1936 CHUNG, DH MIT, CAMBRIDGE, M~SS~CHUSEq~S, USA SHANEL~ND, TJ MIT, CAMBRIDGE, MASS~CHUSEI~fS, US~ General relationships smDr~ sourAd speeds, i. New experimental information. 2. Theory and discussiOn.
4F,4T,30R. PHYS.EARTH AND PLANET.INT.V8,N2,MAR.1974,PlI3.119. New ultrasonic data on some crystal structures important in mantle mineralogy are presented and, with this