Millenary Mw > 9.0 earthquakes required by geodetic strain in the Himalaya

V. L. Stevens, J. P. Avouac

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

The Himalayan arc produced the largest known continental earthquake, the Mw ≈ 8.7 Assam earthquake of 1950, but how frequently and where else in the Himalaya such large-magnitude earthquakes occur is not known. Paleoseismic evidence for coseismic ruptures at the front of the Himalaya with 15 to 30 m of slip suggests even larger events in medieval times, but this inference is debated. Here we estimate the frequency and magnitude of the largest earthquake in the Himalaya needed so that the moment released by seismicity balances the deficit of moment derived from measurements of geodetic strain. Assuming one third of the moment buildup is released aseismically and the earthquakes roughly follow a Gutenberg-Richter distribution, we find that Mw > 9.0 events are needed with a confidence level of at least 60% and must return approximately once per 800 years on average.

Original languageEnglish
Pages (from-to)1118-1123
Number of pages6
JournalGeophysical Research Letters
Volume43
Issue number3
DOIs
Publication statusPublished - 16 Feb 2016

Keywords

  • Himalaya
  • seismic risk

Fingerprint Dive into the research topics of 'Millenary M<sub>w</sub> > 9.0 earthquakes required by geodetic strain in the Himalaya'. Together they form a unique fingerprint.

  • Cite this