Geologic environment of the Van Norman Reservoirs area

Yerkes, R.F.; Bonilla, Manuel G.; Youd, T. Leslie; Sims, John D.

doi:10.3133/cir691a

Cited by 7 publications

(15 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The same sequence of tension cracking and lateral slip within a fault rupture zones was documented at Loma Prieta Martosudarmo et al, 1997) and at Landers . Figure 2 shows horizontal displacements of 12 points near the Sylmar fault segment (data from Yerkes et al, 1974). The displacements are accurate to within f 6 cm.…”

Section: Rupturing Within the Sylmar Fault Zone Segmentmentioning

confidence: 99%

“…All the segments trend E-W except for the Mission Wells segment, which trends NE-SW. This segment was mostly leftlateral with a strike-slip of 0.46 m and a reverse dip-slip of 0.16 m (R=2.9) (Yerkes et al, 1974).…”

Section: Surface Rupture Along San Fernando Faultmentioning

confidence: 99%

“…In order to further explore the association of deformation belts and earthquake ruptures we have decided to re-examine ground deformation produced during the 1971 San Fernando earthquake (ML = 6.4). The Sylmar damage was well-documented and many measurements of displacements (Burford et al, 1971;Yerkes et al, 1974;Savage et al, 1975) and aftershocks (Allen et al, 1971;Hanks et al, 1971;Whitcomb, 1971;Whitcomb et al, 1973;Mori et al, 1995) have been made. The rupture zones and displacements along the San Fernando fault zone were moderately well documented by Sharp (1975 Our study adds one new data set and contributes to another.…”

Section: Introductionmentioning

confidence: 99%

“…A fault zone about 50 m wide shifted. The fault zone consists of five continuous segments (Figure 4) (Yerkes et al, 1974;Weber, 1975).…”

Section: Surface Rupture Along San Fernando Faultmentioning

confidence: 99%

See 3 more Smart Citations

Mechanical Models of Fault-Related Folding

Johnson¹

2003

View full text Add to dashboard Cite

Section: Rupturing Within the Sylmar Fault Zone Segmentmentioning

confidence: 99%

Section: Surface Rupture Along San Fernando Faultmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…A fault zone about 50 m wide shifted. The fault zone consists of five continuous segments (Figure 4) (Yerkes et al, 1974;Weber, 1975).…”

Section: Surface Rupture Along San Fernando Faultmentioning

confidence: 99%

See 2 more Smart Citations

Mechanical Models of Fault-Related Folding

Johnson¹

2003

View full text Add to dashboard Cite

“…A new dam (Los Angeles Dam) is proposed to be built just upstream from the Lower San Fernando Dam, which bas been badly damaged by the earthquake. Comparison of surveys on benchmarks before and after the earthquake showed that the bedrock comprising the left abutment of the proposed new dam was heaved up 0·55 m while the right abutment went up only 0·32 m, for a tilt of 0·23 min a horizontal distance of the order of 400 m (Yerkes et al, 1973).…”

Section: Crustal Deformations Subsidiary Faults and 'Triggered' Faulmentioning

confidence: 99%

Potentially active faults in dam foundations

1974

View full text Add to dashboard Cite

The Paper contains information on existing dams founded on active faults, a summary of pertinent lessons learned from study of historic fault breaks and fault mechanisms, recommended practice for evaluation of active faults, and opinions concerning design of dams on active faults. While a dam site with an active fault should be avoided if possible, if a reservoir is vitally needed and a better site is not available, it is reasonable practice to construct a conservatively designed embankment dam. Concrete dams on active faults, or near some major active faults, are not advisable. For evaluation of fault activity, geological studies usually must be carried a considerable distance from the dam site, a departure from recent past practice. Experience of the last few years with many fault studies indicates that thorough geological investigations with modern techniques will usually provide sufficient evidence to allow a judgement on the activity or inactivity of a fault. Cet Article présente des renseignements pertinents aux barrages construits sur des failles actives, un resumé historique des leçons tirées de la rupture de failles et de leurs mécanismes de rupture, des conseils pratiques pour l'évaluation de l'activité des failles, et des commentaires sur la conception de barrages situés sur des failles actives. Bien que la conception d'un barrage sur une faille active devrait être évitée, la construction d'un barrage en terre conçu d'une façon très sécuritaire est raisonable s'il est absolument nécessaire d'avoir un réservoir à cet endroit et qu'il n'y a pas d'alternative. Il est déconseillé de prévoir des barrages en béton sur des failles actives ou pres d'importantes failles actives. Pour l'evaluation de l'activité d'une faille, il faut entreprendre des études géologiques généralement à une très grande distance du site, ce qui est contraire à une pratique encore récente. L'expérience de ces dernières années,, avec l'étude de nombreuses failles, montre que des études géologiques dééaillées, utilisant des techniques modernes, fourniront normallement suffisament d'évidences pour l'évaluation de l'activité ou de l'inactivité d'une faille.

show abstract

Observations and estimation of long‐period strong ground motion in the los angeles basin

Hanks¹

1976

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

While the accurate estimation of ground‐motion amplitudes across the entire frequency band of engineering interest is not possible at the present time, the excitation and propagation of long‐period strong‐ground motion can be understood with existing seismological methodology. In the Los Angeles Basin, the long‐period strong ground motion excited by the San Fernando earthquake is dominated by the presence of surface waves, whose gross amplitude and frequency content are easily attributable to physical properties of the earthquake source and source‐station propagation paths. Observed measures of the long‐period strong ground motion of the Kern County earthquake relative to the San Fernando earthquake at two sites in the Los Angeles Basin which recorded both shocks can be predicted with considerable accuracy by a simple earthquake source model. This source model is extrapolated to represent the maximum credible earthquake likely to affect the Los Angeles area, taken to be a repeat of the Fort Tejon (1857) earthquake along the San Andreas fault. The measures of long‐period strong ground motion in the Los Angeles Basin estimated for it agree well with the comparable measures of Earthquake A‐2, intended to represent the same situation. For the purpose of aseismic design of long‐period structures, Earthquake A‐2 is a reasonable, if not all inclusive, estimate of the long‐period strong ground motion in the Los Angeles Basin generated by a magnitude 8+ earthquake along the San Andreas fault north and east of Los Angeles.

show abstract

Geologic environment of the Van Norman Reservoirs area

Cited by 7 publications

References 1 publication

Mechanical Models of Fault-Related Folding

Mechanical Models of Fault-Related Folding

Potentially active faults in dam foundations

Observations and estimation of long‐period strong ground motion in the los angeles basin

Contact Info

Product

Resources

About