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| Titel |
Shallow shear-wave reflection seismics in the tsunami struck Krueng Aceh River Basin, Sumatra |
| VerfasserIn |
U. Polom, I. Arsyad, H.-J. Kümpel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 2nd EGU Alexander von Humboldt Conference "The role of Geophysics in Natural Disaster Prevention" ; Nr. 14 (2008-01-02), S.135-140 |
| Datensatznummer |
250012093
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| Publikation (Nr.) |
 copernicus.org/adgeo-14-135-2008.pdf |
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| Zusammenfassung |
| As part of the project "Management of Georisk" (MANGEONAD) of the Federal
Institute for Geosciences and Natural Resources (BGR), Hanover, high
resolution shallow shear-wave reflection seismics was applied in the
Indonesian province Nanggroe Aceh Darussalam, North Sumatra in cooperation
with the Government of Indonesia, local counterparts, and the Leibniz
Institute for Applied Geosciences, Hanover. The investigations were expected
to support classification of earthquake site effects for the reconstruction
of buildings and infrastructure as well as for groundwater exploration. The
study focussed on the city of Banda Aceh and the surroundings of Aceh Besar.
The shear-wave seismic surveys were done parallel to standard geoengineering
investigations like cone penetrometer tests to support subsequent site
specific statistical calibration. They were also partly supplemented by
shallow p-wave seismics for the identification of (a) elastic subsurface
parameters and (b) zones with abundance of groundwater. Evaluation of
seismic site effects based on shallow reflection seismics has in fact been
found to be a highly useful method in Aceh province. In particular, use of a
vibratory seismic source was essential for successful application of
shear-wave seismics in the city of Banda Aceh and in areas with compacted
ground like on farm tracks in the surroundings, presenting mostly
agricultural land use areas. We thus were able to explore the mechanical
stiffness of the subsurface down to 100 m depth, occasionally even deeper,
with remarkably high resolution. The results were transferred into
geotechnical site classification in terms of the International Building Code
(IBC, 2003). The seismic images give also insights into the history of the
basin sedimentation processes of the Krueng Aceh River delta, which is
relevant for the exploration of new areas for construction of safe
foundations of buildings and for identification of fresh water aquifers in
the tsunami flooded region. |
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