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Earthquakes caused by underground nuclear explosions on Pahute Mesa, Nevada test site
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WINCHESTER, JA UNIV.DUBHAM, GB Pattern of regiorml metamorphism suggests a slnistral displacement of 160 km along the Great Glen Fault:3F, 29R. NATURE, PHYS. SCI .V246, N154, i0 DEC. 1973, P@1-84.
Tectonic stress and strain
497 TOKSOEZ, MN KEHRER, HH Tectonic strain release by unlerground nuclear explosions anl its effect on seismic discrimination. GEOPHYS .J.ROY.ASTRON, S0C .VB1, Nl-3,1972, P141-161. The analysis of surface waves from a large number of underground nuclear explosions reinforces the hypothesis of tectonic strain release-. Such strain release is dependent on rock type and ambient stress levels; In harder media, such as granite, strain release is considerably greater than in soft media such as loose alluvium and salt. Auth.
4~ TOKSOEZ, MN KEHR~R, HH Tectomlc strain-release characteristics of CANNIKIN. SEISMOL. SOC. ~ . BULL.V62, N6,1972, P1425-1438. The tectonic strain-release chgracteristics of the CANNIKIN nuclear explosion are determined from surface waves amd static strain changes associated with the even~; Discrepancies between observed and theoretical strains ir~Licate the complexity of strain readJustment; The relatively small amourfG of tectonic strain release associated with CANNIKIN is probably due either to the low rigidity of the medium or to low ambient stresses near the surface.- Auth;
499 TURPENING, RM UNIV.MICHIGAN, USA Release of tectonic strain by large underground nuclear detonation: Final report; Tabls,Refs; DEP. NAT.TECH. INF. SERV.AD-755883,1973,44P. An attempt to observe SH waves from several large undergroumd nuclear explosions at first-zone distances less than (600 km) from each event is described. The data base was supplemented by seismograms from the World Standard Station Network and Canadian Network; In an effort to detect the arrival of any S waves (SV or SH) within this "shadow zone", a flat-layered earth approximation was assigned (with hence critically refracted S-wave paths), ar~ particle motion diagrams were then constructed; (The flat-layered earth hypothesis suggests small argles of incidence and, therefore, rectilinear particle motion); Such rectilinear motion was observed and in several "shadowzone" instarmes, arrival times were consistent with the model chosen7 Auth.
Environmental effects,weathering and soil formation See also abstract: 456. 5OO 05TAFICZUK, S UNIV.WARSAW, PL Large scale landslides in North Western Libya. 12F,16R. ACTA GEOL.POLONICA, V23, N2,1973, P231-244. A zone of large landslides occurs on the border of Hammada al Hamra in HW Libya. The lamdslides occupy an area 250 km lor4E and occur mostly in soft salty clays. Gypmmn which interbeds clays and siltstones shows fine folded entherolitic texture; The direction of fissures agrees with tectonic directions along which the landslide blocks originate; Open fissures are
filled wlth weathered debris. Certain regularities in landslide slope morphology such as constant slope angle, similar size Qf steps down to slop% increasing degree of weatherir~, prove long lastlmg eq~ilibrlum of the landslide processes dermding the slope amd of the eroding processes, 501 LOBO, U DESCON, BOMBAY, IND KARANDIKAR, AV DESCON, BOMBAY, IND Geotechnlcal investigations of sea erosion of a lsterite rocky coast at Cabo, Goa, Proc.- Symposium on Rock Mech.Dhanbsd, Imdla, July 1972. 5F, IT,7R. THE INST. OF ENGRS. C A L L A , INDIA, 1973, P168-183. Geotechnical investigations were conducted in Qrder to determine the geological factors which enco~age erosion in laterite rock anl to develope an overall scheme for total stabilisation of the Cabo coast. Field and laboratary testimg were carried out several remedial measures were suggested;
Earthquake mechanisms and effects 502 MERCh~, J UNIV. PARIS- SUD, ORSAY2 F V~qGELYI P UNIV. PARIS- SUDs ORSAYj F DELIBASSI Sj N SEIS4OLOG. INST •ATHENSj GR Comparison between deformation deduced from the analys of recent faults and from focal mechni~ns of eartmqus~ An exsmple~ the Pal~hos region s Cyprus. 13F, IT~ISR. TECTONOPHYSICS, Vlg, N4,1973, P315-332. The authors have m~de a comparative study of surface deformation deduced from the analysis of recer~ faults and deformation in depth deduced from focal mechanisms associated with shallow earthquakes. The initial resu obtained in the Paphos region of Cyprus are presented; Two of the fault plane solutions obtained from the Paphos shallow earthquake are compatible with the results derived by analysis of the plio-quarternary sumfaee faults;
503 WAHLER,WA W.A.WAHI~ AND ASSOC.PALO ALTO, USA Earthqt%ake research applied to slope stabilit~r; J. CONSTRUCT .DIV.V99, C01,1973, PI-4. Recent earthquake research indicates that traditional slope stability analyses do not even approximate actual earthquake action. New and im_~oved analytical and testir~ techniques now make it possible to approa~ earthquake action analyses on a rational basis. These techniques must be used to minimize the probability of slope failures and to minimize the effect of failur that cannot be precluded. The progress made must be used even though absolute results cannot yet be guaranteed - earthquake analyses ~ engineering is still an art and not yet a fully developed science but progress has been made. Auth.
5o4 OBERTI, G CASTOLDI, A CASIRATI, M Dynamic investigations of an excavation. An elastic model study. In Italian. 12F,16R. ISMES, BERGAMO, REP. NS1,1972, 20P.
505 REPORT Relationships of earthquakes and geology i n west Tennessee
and ~Jacent
areas.
TENNESSEE V~TT~Y AUTHORITY, KNOXVILLE, NP-19375, 1972,380P. An investigation was comdueted to evaluate the seismic potential of the r ~ h e r n I x ~ i o n of the Mississippi Embayment prov~nce based on the interrelationships between seismic history I geologic history, and geologic structure of the region; Data
WINCHESTER, JA UNIV.DUBHAM, GB Pattern of regiorml metamorphism suggests a slnistral displacement of 160 km along the Great Glen Fault:3F, 29R. NATURE, PHYS. SCI .V246, N154, i0 DEC. 1973, P@1-84.
Tectonic stress and strain
497 TOKSOEZ, MN KEHRER, HH Tectonic strain release by unlerground nuclear explosions anl its effect on seismic discrimination. GEOPHYS .J.ROY.ASTRON, S0C .VB1, Nl-3,1972, P141-161. The analysis of surface waves from a large number of underground nuclear explosions reinforces the hypothesis of tectonic strain release-. Such strain release is dependent on rock type and ambient stress levels; In harder media, such as granite, strain release is considerably greater than in soft media such as loose alluvium and salt. Auth.
4~ TOKSOEZ, MN KEHR~R, HH Tectomlc strain-release characteristics of CANNIKIN. SEISMOL. SOC. ~ . BULL.V62, N6,1972, P1425-1438. The tectonic strain-release chgracteristics of the CANNIKIN nuclear explosion are determined from surface waves amd static strain changes associated with the even~; Discrepancies between observed and theoretical strains ir~Licate the complexity of strain readJustment; The relatively small amourfG of tectonic strain release associated with CANNIKIN is probably due either to the low rigidity of the medium or to low ambient stresses near the surface.- Auth;
499 TURPENING, RM UNIV.MICHIGAN, USA Release of tectonic strain by large underground nuclear detonation: Final report; Tabls,Refs; DEP. NAT.TECH. INF. SERV.AD-755883,1973,44P. An attempt to observe SH waves from several large undergroumd nuclear explosions at first-zone distances less than (600 km) from each event is described. The data base was supplemented by seismograms from the World Standard Station Network and Canadian Network; In an effort to detect the arrival of any S waves (SV or SH) within this "shadow zone", a flat-layered earth approximation was assigned (with hence critically refracted S-wave paths), ar~ particle motion diagrams were then constructed; (The flat-layered earth hypothesis suggests small argles of incidence and, therefore, rectilinear particle motion); Such rectilinear motion was observed and in several "shadowzone" instarmes, arrival times were consistent with the model chosen7 Auth.
Environmental effects,weathering and soil formation See also abstract: 456. 5OO 05TAFICZUK, S UNIV.WARSAW, PL Large scale landslides in North Western Libya. 12F,16R. ACTA GEOL.POLONICA, V23, N2,1973, P231-244. A zone of large landslides occurs on the border of Hammada al Hamra in HW Libya. The lamdslides occupy an area 250 km lor4E and occur mostly in soft salty clays. Gypmmn which interbeds clays and siltstones shows fine folded entherolitic texture; The direction of fissures agrees with tectonic directions along which the landslide blocks originate; Open fissures are
filled wlth weathered debris. Certain regularities in landslide slope morphology such as constant slope angle, similar size Qf steps down to slop% increasing degree of weatherir~, prove long lastlmg eq~ilibrlum of the landslide processes dermding the slope amd of the eroding processes, 501 LOBO, U DESCON, BOMBAY, IND KARANDIKAR, AV DESCON, BOMBAY, IND Geotechnlcal investigations of sea erosion of a lsterite rocky coast at Cabo, Goa, Proc.- Symposium on Rock Mech.Dhanbsd, Imdla, July 1972. 5F, IT,7R. THE INST. OF ENGRS. C A L L A , INDIA, 1973, P168-183. Geotechnical investigations were conducted in Qrder to determine the geological factors which enco~age erosion in laterite rock anl to develope an overall scheme for total stabilisation of the Cabo coast. Field and laboratary testimg were carried out several remedial measures were suggested;
Earthquake mechanisms and effects 502 MERCh~, J UNIV. PARIS- SUD, ORSAY2 F V~qGELYI P UNIV. PARIS- SUDs ORSAYj F DELIBASSI Sj N SEIS4OLOG. INST •ATHENSj GR Comparison between deformation deduced from the analys of recent faults and from focal mechni~ns of eartmqus~ An exsmple~ the Pal~hos region s Cyprus. 13F, IT~ISR. TECTONOPHYSICS, Vlg, N4,1973, P315-332. The authors have m~de a comparative study of surface deformation deduced from the analysis of recer~ faults and deformation in depth deduced from focal mechanisms associated with shallow earthquakes. The initial resu obtained in the Paphos region of Cyprus are presented; Two of the fault plane solutions obtained from the Paphos shallow earthquake are compatible with the results derived by analysis of the plio-quarternary sumfaee faults;
503 WAHLER,WA W.A.WAHI~ AND ASSOC.PALO ALTO, USA Earthqt%ake research applied to slope stabilit~r; J. CONSTRUCT .DIV.V99, C01,1973, PI-4. Recent earthquake research indicates that traditional slope stability analyses do not even approximate actual earthquake action. New and im_~oved analytical and testir~ techniques now make it possible to approa~ earthquake action analyses on a rational basis. These techniques must be used to minimize the probability of slope failures and to minimize the effect of failur that cannot be precluded. The progress made must be used even though absolute results cannot yet be guaranteed - earthquake analyses ~ engineering is still an art and not yet a fully developed science but progress has been made. Auth.
5o4 OBERTI, G CASTOLDI, A CASIRATI, M Dynamic investigations of an excavation. An elastic model study. In Italian. 12F,16R. ISMES, BERGAMO, REP. NS1,1972, 20P.
505 REPORT Relationships of earthquakes and geology i n west Tennessee
and ~Jacent
areas.
TENNESSEE V~TT~Y AUTHORITY, KNOXVILLE, NP-19375, 1972,380P. An investigation was comdueted to evaluate the seismic potential of the r ~ h e r n I x ~ i o n of the Mississippi Embayment prov~nce based on the interrelationships between seismic history I geologic history, and geologic structure of the region; Data