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Auteurs :
Schwanghart, Wolfgang

Description :

International audience

Geomorphic footprints of past large Himalayan earthquakes are elusive, though urgently needed for gauging and predicting recovery times of seismically perturbed mountain landscapes. We present evidence of catastrophic valley infill following at least three medieval earthquakes in the Nepal Himalayas. Radiocarbon dates from peat beds, plant macrofossils, and humic silts in fine-grained tributary sediments near Pokhara, Nepal’s second largest city, match the timing of nearby M > 8earthquakes in ~1100, 1255, and 1344 C.E. The upstream dip of tributary valley fills and X-ray fluorescence spectrometry of their provenance rule out local sources. Instead, geomorphic and sedimentary evidence is consistent with catastrophic fluvial aggradation and debris flows that had plugged several tributaries with tens of meters of calcareous sedimentfrom a Higher Himalayan source >60 km away.



Mots-clés :
tributaire - tremblement de terre - Népal - Himalaya - sédiment calcaire - remplissage de vallée - [SDU] Sciences of the Universe [physics] - [SDU.STU] Sciences of the Universe [physics]/Earth Sciences - [SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/Geomorphology - [SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics

Editeur :
HAL CCSD, American Association for the Advancement of Science

Langue :
en

Type de document :
info:eu-repo/semantics/article, Journal articles

Source :
ISSN: 0036-8075; EISSN: 1095-9203; Science; https://hal.archives-ouvertes.fr/hal-01262071; Science, American Association for the Advancement of Science, 2016, 351 (6269), p. 147-150. <10.1126/science.aac8353>

Date :
2016

Contributeurs :
Institute of Earth and Environmental Science, University of Potsdam, Potsdam
Institute of Geographica lSciences, Freie Universität Berlin
Institute of Engineering, Tribhuvan University, Kathmandu
German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ)
Pôle de recherche pour l'organisation et la diffusion de l'information géographique (PRODIG) ; Université Panthéon-Sorbonne (UP1) - Institut de Recherche pour le Développement (IRD) - École pratique des hautes études (EPHE) - Université Paris-Sorbonne (UP4) - AgroParisTech - Université Paris Diderot - Paris 7 (UPD7) - Centre National de la Recherche Scientifique (CNRS)

Identifiants :
hal-01262071
https://hal.archives-ouvertes.fr/hal-01262071
DOI : 10.1126/science.aac8353

Relations :

info:eu-repo/semantics/altIdentifier/doi/10.1126/science.aac8353