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Recognizing fracture pattern signatures contributed by seismic loadings

Xu Shiqing
Recognizing fracture pattern signatures contributed by seismic loadings
Interpretation (Tulsa) (August 2020) 8 (4): SP95-SP108

Abstract

The impacts of seismic loadings to fault zone rocks still are not well understood. Although field and experimental studies have suggested several markers, such as pseudotachylytes and pulverized rocks, for indicating seismic loadings, the corresponding markers of other types or at larger scales still are lacking. Drawing from the results of dynamic ruptures with off-fault damage, we have recognized several additional fracture features that may be used to reflect the involvement of seismic loadings. For strike-slip faults stressed at moderate to high angles, synthetic R shear is more favored during rupture propagation, but pronounced antithetic R' shear can be generated around the termination end of the rupture. In addition, suitably oriented weak structures off the main fault can further facilitate the activation of R' shear. For low-angle thrust faults such as subduction zones, splay faults in the form of forethrusts and backthrusts still can be generated above the coseismic rupture zone. These faults show an increased spatial extent toward the updip direction, effectively defining an outer wedge susceptible to pervasive compressional failure over its entire depth range. Moreover, a deeply nucleated megathrust rupture that eventually reaches the trench can sequentially load the frontal wedge in compression and then in extension, with the potential to leave a mixture of triggered reverse and normal faults at the final stage. Because the above results also are supported by many observations, they raise a caution that existing fault models ignoring dynamic effects should be used with care and that seismic loadings must be considered more seriously by future fault zone studies.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 8
Serial Issue: 4
Title: Recognizing fracture pattern signatures contributed by seismic loadings
Author(s): Xu Shiqing
Affiliation: Southern University of Science and Technology, Department of Earth and Space Sciences, Shenzhen, China
Pages: SP95-SP108
Published: 202008
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 116
Accession Number: 2020-069058
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 2020
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