Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Active tectonics of the eastern Himalaya; new constraints from the first tectonic geomorphology study in southern Bhutan

Theo Berthet, Jean-Francois Ritz, Matthieu Ferry, Phuntsho Pelgay, Rodolphe Cattin, Dowchu Drukpa, Regis Braucher and Gyorgy Heteny
Active tectonics of the eastern Himalaya; new constraints from the first tectonic geomorphology study in southern Bhutan
Geology (Boulder) (March 2014) 42 (5): 427-430

Abstract

How convergent systems distribute strain among frontal thrusts is a major concern regarding seismic hazard assessment. Along the 2500 km Himalayan arc, the seismic behavior of the Bhutan region is unknown, because it corresponds to the only portion of the arc where no evidence of major earthquakes has been reported. This can be due either to the fact that no active tectonic studies have been conducted or to continental shortening being absorbed by the Shillong plateau 150 km farther south. Analyzing offset fluvial terraces in south-central Bhutan shows that two major earthquakes ruptured the Himalayan frontal thrust during the last millennium, and that a comparable rate of Holocene deformation ( approximately 20 mm/yr) is accommodated across the Himalaya in Bhutan as in central Nepal. Thus, the propensity for great earthquakes in Bhutan is similar to what is observed in neighboring portions of the Himalaya arc. This in turn suggests that the shortening process beneath the Shillong plateau has little effect on how strain accumulates within the Bhutanese Himalaya.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 42
Serial Issue: 5
Title: Active tectonics of the eastern Himalaya; new constraints from the first tectonic geomorphology study in southern Bhutan
Affiliation: Universite Montpellier, Geosciences Montpellier, Montpellier, France
Pages: 427-430
Published: 20140331
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 17
Accession Number: 2014-028742
Categories: Structural geologySeismology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2014152
Illustration Description: illus. incl. geol. sketch map
N27°00'00" - N37°00'00", E72°00'00" - E97°00'00"
N26°30'00" - N28°30'00", E88°40'00" - E92°10'00"
Secondary Affiliation: Ministry of Economic Affairs, NPL, NepalAix-Marseille Universite, FRA, FranceEidgenoessische Technische Hochschule Zurich, CHE, Switzerland
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201418
Close Modal

or Create an Account

Close Modal
Close Modal