Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Tectonic evolution and stress pattern of South Wagad Fault at the Kachchh rift basin in western India

G. C. Kothyari, R. K. Dumka, A. P. Singh, G. Chauhan, M. G. Thakkar and S. K. Biswas
Tectonic evolution and stress pattern of South Wagad Fault at the Kachchh rift basin in western India
Geological Magazine (July 2017) 154 (4): 875-887

Abstract

We describe a study of the E-W-trending South Wagad Fault (SWF) complex at the eastern part of the Kachchh Rift Basin (KRB) in Western India. This basin was filled during Late Cretaceous time, and is presently undergoing tectonic inversion. During the late stage of the inversion cycle, all the principal rift faults were reactivated as transpressional strike-slip faults. The SWF complex shows wrench geometry of an anastomosing en echelon fault, where contractional and extensional segments and offsets alternate along the Principal Deformation Zone (PDZ). Geometric analysis of different segments of the SWF shows that several conjugate faults, which are a combination of R synthetic and R' antithetic, propagate at a short distance along the PDZ and interact, generating significant fault slip partitioning. Surface morphology of the fault zone revealed three deformation zones: a 500 m to 1 km wide single fault zone; a 5-6 km wide double fault zone; and a c. 500 m wide diffuse fault zone. The single fault zone is represented by a higher stress accumulation which is located close to the epicentre of the 2001 Bhuj earthquake of M (sub w) 7.7. The double fault zone represents moderate stress at releasing bends bounded by two fault branches. The diffuse fault zone represents a low-stress zone where several fault branches join together. Our findings are well corroborated with the available geological and seismological data.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 154
Serial Issue: 4
Title: Tectonic evolution and stress pattern of South Wagad Fault at the Kachchh rift basin in western India
Affiliation: Government of Gujarat, Institute of Seismological Research, India
Pages: 875-887
Published: 201707
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 60
Accession Number: 2017-076096
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N22°30'00" - N24°15'00", E69°00'00" - E71°30'00"
Secondary Affiliation: Krantiguru Shyamji Krishna Verma Kachchh University, IND, India
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201740
Close Modal

or Create an Account

Close Modal
Close Modal