HR: 0803h
AN: NS11D-0796    [Abstracts]
TI: Classification of earthquake site effects by shallow reflection seismics using a shear-wave land-streamer system
AU: Polom, U
EM: Ulrich.Polom@gga-hannover.de
AF: Leibniz Institute for Applied Geosciences (GGA), Stilleweg 2, Hannover, D-30655, Germany
AU: Arsyad, I
EM: Idawatid@yahoo.com
AF: Dinas Pertambangan dan Energi, Jalan Tengku Nyak Arief No.195, Banda Aceh, 40122, Indonesia
AU: Wiyono, S
EM: wiyonoplg@gmail.com
AF: Center for Environmental Geology, Jl. Diponegoro 57, Bandung, 40122, Indonesia
AU: * Krawczyk, C M
EM: lotte@gga-hannover.de
AF: Leibniz Institute for Applied Geosciences (GGA), Stilleweg 2, Hannover, D-30655, Germany
AB: Touched in the SW by the Great Sumatra Fault, the densely populated delta of the Krueng Aceh River consists mainly of young alluvial sediments of clay, sand and gravel with partially high organic content. The depth of this sediment body and its internal structure are widely unknown. Whereas traditional timber constructed buildings are mostly unaffected by strong earthquakes, the change to concrete building techniques added a significant new and locally unknown seismic risk in this region. The classification of earthquake site effects in the city of Banda Aceh and the surrounding region of Aceh Besar was the aim of a high-resolution shear-wave reflection seismic survey in the Indonesian province Nanggroe Aceh Darussalam. In cooperation with the Government of Indonesia and local counterparts, this was part of the Project "Management of Georisk" of the Federal Institute for Geosciences and Natural Resources. Using shear-wave reflection seismics in combination with a land streamer has proven to be an enormously useful method in the sedimentary regions of the Aceh province with an easy and fast recording operation. In addition, the specialized seismic system accounts for compacted soil surfaces which allows a wide range of applications within cities, industrial sites, paved roads and also on small dirt roads. Using a vibrator seismic source, this technique was applied successfully also in areas of high building density in the city of Banda Aceh or in the surrounding mostly agricultural environment. Combined with standard geoengineering investigations like cone penetrometer tests, it was possible to evaluate the soil stiffness in populated urban areas down to 100 m depth in terms of the IBC2003. This is important for the exploration of new areas for save building foundation and groundwater aquifer detection in the tsunami-flooded region.
DE: 1820 Floodplain dynamics
DE: 1865 Soils (0486)
DE: 7212 Earthquake ground motions and engineering seismology
DE: 7294 Seismic instruments and networks (0935, 3025)
SC: Near-Surface Geophysics [NS]
MN: 2007 Fall Meeting