Epicenter distribution and magnitude of earthquakes in fold‐thrust belts: Insights from Sandbox Models

Epicenter distribution and magnitude of earthquakes in fold‐thrust belts: Insights from Sandbox... Scaled analogue models are used to illustrate the effect of basal friction and erosion on fault activity and hence on epicentre distribution and magnitude of earthquakes in the sedimentary cover of active fold‐thrust belts. Model results suggest that in fold‐thrust belts shortened above low‐friction ductile decollements (rock salt or over‐pressured mudstone), low‐ to moderate‐magnitude earthquakes (Mw = 5.3–5.6), distributed over a wide area, occur along several long‐lived thrust faults. Conversely, in areas shortened above high‐friction decollements large‐magnitude earthquakes (Mw = 6.6–6.8), distributed over a narrow zone are likely to occur along few short‐lived thrust ramps. Calculated magnitude of earthquakes from models and their distribution are in agreement with recorded earthquake pattern from the Zagros mountain belt, which is partially shortened above a ductile decollement of Hormuz salt formation. Model results also showed that erosion reactivates older inactive thrusts and promotes formation of out‐of‐sequence thrusts. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

Epicenter distribution and magnitude of earthquakes in fold‐thrust belts: Insights from Sandbox Models

Loading next page...
 
/lp/wiley/epicenter-distribution-and-magnitude-of-earthquakes-in-fold-thrust-4ZamWSQ0Xn
Publisher
Wiley
Copyright
Copyright © 2000 by the American Geophysical Union.
ISSN
0094-8276
eISSN
1944-8007
DOI
10.1029/1999GL010833
Publisher site
See Article on Publisher Site

Abstract

Scaled analogue models are used to illustrate the effect of basal friction and erosion on fault activity and hence on epicentre distribution and magnitude of earthquakes in the sedimentary cover of active fold‐thrust belts. Model results suggest that in fold‐thrust belts shortened above low‐friction ductile decollements (rock salt or over‐pressured mudstone), low‐ to moderate‐magnitude earthquakes (Mw = 5.3–5.6), distributed over a wide area, occur along several long‐lived thrust faults. Conversely, in areas shortened above high‐friction decollements large‐magnitude earthquakes (Mw = 6.6–6.8), distributed over a narrow zone are likely to occur along few short‐lived thrust ramps. Calculated magnitude of earthquakes from models and their distribution are in agreement with recorded earthquake pattern from the Zagros mountain belt, which is partially shortened above a ductile decollement of Hormuz salt formation. Model results also showed that erosion reactivates older inactive thrusts and promotes formation of out‐of‐sequence thrusts.

Journal

Geophysical Research LettersWiley

Published: Jan 15, 2000

References

  • Critical taper model of fold‐and‐thrust belts and accretionary wedges
    Dahlen, Dahlen
  • The emergent Hormuz salt plugs of southern Iran
    Kent, Kent
  • Mode of internal deformation in sand wedges
    Koyi, Koyi
  • The break‐back thrust splay of the Main Dun Thrust (Himalayas of Western Nepal): Evidence of an intermediate displacement scale between earthquake slip and finite geometry of thrust systems
    Mugnier, Mugnier; Delcaillau, Delcaillau; Huyghe, Huyghe; Leturmy, Leturmy

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create folders to
organize your research

Export folders, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off