Relationship between thrust-fault ramps and normal faults: Results from reflection seismic imaging and finite-element analysis

Gopal K. Mohapatra, Roy A Johnson

Research output: Contribution to conferencePaper

1 Scopus citations

Abstract

The Great Salt Lake basin in northern Utah is one of the largest, and perhaps the most continuously active, Tertiary basin in the eastern Basin and Range Province. Reflection seismic data from the basin show that the major basin-bounding faults are listric in nature. Normal-fault reactivation of Sevier-age(?) thrust-fault ramps evident on the seismic data suggests that the maximum depth of penetration and soling of these listric faults may have been strongly controlled by these older structures. Viscoelastic finite-element modeling of reactivation of an older thrust fault demonstrates that a secondary synthetic normal-fault configuration is favored in viscoelastic-brittle rocks subjected to pure extension. Slip on the thrust-fault surface causes brittle failure of rocks in a region where synthetic secondary faulting can take advantage of the preexisting weakness. Slip along the newly formed synthetic fault leads to failure in a different region, where antithetic faulting will occur, resulting in the formation of a graben. Results from the interpretation of Great Salt Lake reflection seismic data show similar relationships.

Original languageEnglish (US)
Pages507-510
Number of pages4
StatePublished - Jan 1 1995
Event1995 Society of Exploration Geophysicists Annual Meeting, SEG 1995 - Houston, United States
Duration: Oct 8 1995Oct 13 1995

Other

Other1995 Society of Exploration Geophysicists Annual Meeting, SEG 1995
CountryUnited States
CityHouston
Period10/8/9510/13/95

ASJC Scopus subject areas

  • Geophysics

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    Mohapatra, G. K., & Johnson, R. A. (1995). Relationship between thrust-fault ramps and normal faults: Results from reflection seismic imaging and finite-element analysis. 507-510. Paper presented at 1995 Society of Exploration Geophysicists Annual Meeting, SEG 1995, Houston, United States.