How perfect is the Himalayan arc?

Citation
R. Bendick et R. Bilham, How perfect is the Himalayan arc?, GEOLOGY, 29(9), 2001, pp. 791-794
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
GEOLOGY
ISSN journal
0091-7613 → ACNP
Volume
29
Issue
9
Year of publication
2001
Pages
791 - 794
Database
ISI
SICI code
0091-7613(200109)29:9<791:HPITHA>2.0.ZU;2-I
Abstract
The Himalayan plate boundary, because it is entirely subaerial, is both the most dramatic and the most accessible to direct observation of all active convergent boundaries on Earth. The shape of this boundary can be described as a small circle of radius 1696 +/- 55 km, centered at long 91.6 degrees +/- 1.6 degreesE and lat 42.4 degrees +/- 2.1 degreesN for the extent of th e are between long 77.2 degrees and 92.1 degreesE. The pole of this small c ircle is consistent whether seismicity, topography, or stress state is used to define the position of the tectonic boundary. The defined small circle also coincides with a peak in microseismicity, the maximum horizontal strai n rate, and a peak in the vertical velocity field. This quantitative defini tion of a stable, curved tectonic boundary is a prerequisite to modeling th e dynamics of curvature in convergent arcs and applying appropriate boundar y conditions to other regional models.