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Case Study: Geophysical Investigations of Alleged Quarry Blast Damage to Buildings in Lokgwabe Village
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Author(s): Kebabonye Laletsang (University of Botswana, Botswana)and Baram Montshiwa (University of Botswana, Botswana)
Copyright: 2018
Pages: 17
Source title:
Handbook of Research on Geospatial Science and Technologies
Source Author(s)/Editor(s): Joyce Gosata Maphanyane (University of Botswana, Botswana), Read Brown Mthanganyika Mapeo (University of Botswana, Botswana)and Modupe O. Akinola (University of Lagos, Nigeria)
DOI: 10.4018/978-1-5225-3440-2.ch014
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Abstract
A geophysical survey was carried out in 2012 to map the subsurface geology at a quarry and the village to determine if an alleged damage to houses could have been caused by blasting activity in the quarry. The survey included seismic refraction and reflection recorded with the same spread at source and receiver spacing of 2 m, 3 m, and 5 m. The signal source was a 28-lb. sledge hammer stacked 10 times to increase the S/N. Ground penetrating radar (GPR) was also recorded at a trace spacing of 0.3 m to provide detailed images of the subsurface near the damaged buildings using a 50 MHz unshielded antenna. The seismic refraction and reflection profiles show that the village is underlain by 0-4 m of loose sand, 4-10 m of fractured calcrete, and up to 50 m of fractured silcrete, with the groundwater table at 10-15 m. The GPR images show that the damaged houses sit on thick sand, which cushions them against severe ground vibration. The houses were found to have suffered more damage on the superstructure and this is possibly due to ground vibration amplification at low frequencies of 30-40 Hz.
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