The aim of this study was to investigate the seismicity of north-western Namibia, which correlates with a zone of predicted long-term average high strain rates. Consequently, the local seismicity was monitored over a five month-period (01 January โ 31 May 2012) to determine how seismically active the area actually is. During this time a total of 281 earthquakes, 149 of which were aftershocks, with local magnitudes from -0.4 to 4.7 ML were recorded. Analysis centred upon events surrounding the earthquake which occurred on March 24, 2012 (origin time 4:43:52, location -20.127o S / 14.461o E, depth of 0.1 km and magnitude 4.7 ML) approximately 60 km northwest of Khorixas, in order to identify precursors, if any, as well as the sequence of aftershocks. The present investigation revealed a new seismic zone characterised by smaller magnitude earthquakes, named here the Kamanjab Seismic Zone. The study is part of the WALPASS project which deployed 40 temporary seismic stations on- and offshore north-western Namibia from October 2010 to November 2012. Its goals were to image the lithosphere and deeper upper mantle in the ocean-continent transition beneath the passive continental margin of northern Namibia, and to detect seismic anomalies. Keywords: Seismicity, earthquake, Kamanjab Seismic Zone.
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Seismicity of north_western Namibia during the Period 01 January to 31 May 2012.pdf | 1.56 MB |