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  The Fine Structure of the Subducted Investigator Fracture Zone in Western Sumatra as Seen by Local Seismicity

Lange, D., Tilmann, F., Rietbrock, A., Collings, R., Natawidjaja, D. H., Suwargadi, B. W., Barton, P., Henstock, T., Ryberg, T. (2010): The Fine Structure of the Subducted Investigator Fracture Zone in Western Sumatra as Seen by Local Seismicity. - Earth and Planetary Science Letters, 298, 1-2, 47-56.
https://doi.org/10.1016/j.epsl.2010.07.020

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 Creators:
Lange, D.1, 2, 3, Author
Tilmann, Frederik2, 3, 4, Author              
Rietbrock, A.1, 2, 3, Author
Collings, R.1, 2, 3, Author
Natawidjaja, D. H.1, 2, 3, Author
Suwargadi, B. W.1, 2, 3, Author
Barton, P.1, 2, 3, Author
Henstock, T.1, 2, 3, Author
Ryberg, Trond2, 3, 5, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum, Potsdam, ou_44021              
3GEOFON, Deutsches GeoForschungsZentrum, Potsdam, , ou_2634888              
42.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_30023              
52.2 Geophysical Deep Sounding, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_66027              

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Free keywords: local seismicity, subduction zone, ridge subduction, sumatra
 DDC: 550 - Earth sciences
 Abstract: The Sumatran margin suffered three great earthquakes in recent years (Aceh-Andaman 26 December 2004 Mw = 9.1, Nias 28 March 2005 Mw = 8.7, Bengkulu 12 September 2007 Mw = 8.5). Here we present local earthquake data from a dense, amphibious local seismic network covering a segment of the Sumatran margin that last ruptured in 1797. The occurrence of forearc islands along this part of the Sumatran margin allows the deployment of seismic land-stations above the shallow part of the thrust fault. In combination with ocean bottom seismometers this station geometry provides high quality hypocentre location for the updip end of the seismogenic zone in an area where geodetic data are also available. In this region, the Investigator Fracture Zone (IFZ), which consists of 4 sub-ridges, is subducted below the Sunda plate. This topography appears to influence seismicity at all depth intervals. A well-defined linear streak of seismicity extending from 80 to 200 km depth lies along the prolongation of closely spaced IFZ sub-ridges. More intermediate depth seismicity is located to the southeast of this string of seismicity and is related to subducted rough oceanic seafloor. The plate interface beneath Siberut Island which ruptured last in 1797 is characterised by almost complete absence of seismicity.

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Language(s): eng - English
 Dates: 2010
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: eDoc: 15263
GFZPOF: PT2 Earth System Dynamics: Coupled Processes and Regional Impact
DOI: 10.1016/j.epsl.2010.07.020
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Title: Earth and Planetary Science Letters
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 298 (1-2) Sequence Number: - Start / End Page: 47 - 56 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals99