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in creator/contributor: "Johnson, A. M."  
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Mechanical Models of Fault-Related Folding

Description: The subject of the proposed research is fault-related folding and ground deformation. The results are relevant to oil-producing structures throughout the world, to understanding of damage that has been observed along and near earthquake ruptures, and to earthquake-producing structures in California and other tectonically-active areas. The objectives of the proposed research were to provide both a unified, mechanical infrastructure for studies of fault-related foldings and to present the results… more
Date: January 9, 2003
Creator: Johnson, A. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Character and origins of ground rupturing and ground deformation during the 28 June 1992 Landers, California earthquake (as well as the 1989 Loma Prieta and 1994 Northridge earthquakes). Final report

Description: The overall objective of the research has been to understand the form and significance of surface rupture produced by earthquakes. Specific objectives are to describe fracturing and other manifestations of broad belts of ground rupture during the Landers earthquake and to mechanically analyze the structures that form along the belts. The author has learned much about ground rupture during earthquakes, even though he has studied only three earthquakes to date: Loma Prieta, Landers and Northridge. more
Date: September 17, 1996
Creator: Johnson, A.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Broad belts of shear zones: The common form of surface rupture produced by the 28 June 1992 Landers, California, earthquake

Description: Surface rupturing during the 28 June 1992, Landers, California earthquake, east of Los Angeles, accommodated right-lateral offsets up to about 6 m along segments of distinct, en echelon fault zones with a total length of about 80 km. The offsets were accommodated generally not by faults -- distinct slip surfaces -- but rather by shear zones, tabular bands of localized shearing. In long, straight stretches of fault zones at Landers the rupture is characterized by telescoping of shear zones and i… more
Date: December 31, 1993
Creator: Johnson, A.M.; Cruikshank, K.M. & Fleming, R.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ground fracturing at the southern end of Summit Ridge caused by October 17, 1989 Loma Prieta, California, earthquake sequence (maps of Summit Ridge Shear Zones, en echelon tension cracks, complex and compound fractures, and small faults that formed coactively with the earthquake sequence)

Description: The Loma Prieta earthquake of 17 October 1989 was the first of three large earthquakes that occurred in California in less than 5 years. The main shock of the Loma Prieta earthquake was deep-seated, the rupture zones of the main shock did not reach the surface, and the earthquake produced enigmatic surface ruptures along the frontal faults of the Coast Range and in the epicentral area that were explained in several quite different ways. The Landers earthquake of 28 June 1992 was near surface an… more
Date: December 31, 1997
Creator: Martosudarmo, S.Y.; Johnson, A.M. & Fleming, R.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Winnetka deformation zone: Surface expression of coactive slip on a blind fault during the Northridge earthquake sequence, California. Evidence that coactive faulting occurred in the Canoga Park, Winnetka, and Northridge areas during the 17 January 1994, Northridge, California earthquake

Description: Measurements of normalized length changes of streets over an area of 9 km{sup 2} in San Fernando Valley of Los Angeles, California, define a distinctive strain pattern that may well reflect blind faulting during the 1994 Northridge earthquake. Strain magnitudes are about 3 {times} 10{sup {minus}4}, locally 10{sup {minus}3}. They define a deformation zone trending diagonally from near Canoga Park in the southwest, through Winnetka, to near Northridge in the northeast. The deformation zone is abo… more
Date: December 31, 1996
Creator: Cruikshank, K. M.; Johnson, A. M.; Fleming, R. W. & Jones, R. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low dose radiation hypersensitivity and clustered DNA damages in human fibroblasts exposed to low dose and dose rate protons or 137CS y-rays

Description: Effective radioprotection for human space travelers hinges upon understanding the individual properties of charged particles. A significant fraction of particle radiation astronauts will encounter in space exploratory missions will come from high energy protons in galactic cosmic radiation (GCR) and/or possible exposures to lower energy proton flux from solar particle events (SPEs). These potential exposures present major concerns for NASA and others, in planning and executing long term space e… more
Date: May 14, 2013
Creator: Bennett, P. V.; Keszenman, D. J.; Johnson, A. M.; Sutherland, B. M. & Wilson, P. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Analecta of structures formed during the 28 June 1992 Landers-Big Bear, California earthquake sequence (including maps of shear zones, belts of shear zones, tectonic ridge, duplex en echelon fault, fault elements, and thrusts in restraining steps)

Description: The June 28, 1992, M{sub s} 7.5 earthquake at Landers, California, which occurred about 10 km north of the community of Yucca Valley, California, produced spectacular ground rupturing more than 80 km in length (Hough and others, 1993). The ground rupturing, which was dominated by right-lateral shearing, extended along at least four distinct faults arranged broadly en echelon. The faults were connected through wide transfer zones by stepovers, consisting of right-lateral fault zones and tension … more
Date: December 31, 1997
Creator: Johnson, A.M.; Johnson, N.A.; Johnson, K.M.; Wei, W.; Fleming, R.W.; Cruikshank, K.M. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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