LISPWAL: Lithospheric structure of the Namibian continental passive margin at the intersection with the Walvis Ridge from amphibious seismic investigations November 2010

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false4DOIDB.GIPP 10.5880/GIPP.201019.1 Ryberg, Trond Trond Ryberg 0000-0001-7129-5596 GFZ German Research Centre for Geosciences, Potsdam, Germany Haberland, Christian Christian Haberland 0000-0002-2981-7087 GFZ German Research Centre for Geosciences, Potsdam, Germany Weber, Michael Michael Weber 0000-0002-3061-9758 GFZ German Research Centre for Geosciences, Potsdam, Germany Jokat, Wilfried Wilfried Jokat 0000-0002-7793-5854 Alfred Wegener Institut Helmholtz Centre for Polar and Marine Research. Bremerhaven, Germany Behrmann, Jan Jan Behrmann 0000-0001-7435-7721 GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany Gassner, Alexandra Alexandra Gassner 0000-0002-4866-993X GFZ German Research Centre for Geosciences, Potsdam, Germany LISPWAL: Lithospheric structure of the Namibian continental passive margin at the intersection with the Walvis Ridge from amphibious seismic investigations November 2010 – January 2011, Namibia - Datasets Deutsches GeoForschungsZentrum GFZ 2014 LISPWAL geophysics controlled-source seismic survey onshore offshore continental margin Namibia CONTROLLED_SOURCE_SEISMOLOGY > REFRACTION CONTROLLED_SOURCE_SEISMOLOGY > WIDE-ANGLE_REFLECTION_REFRACTION CONTROLLED_SOURCE_SEISMOLOGY > EXPLOSION_SOURCE CONTROLLED_SOURCE_SEISMOLOGY > CRUSTAL_SCALE CONTROLLED_SOURCE_SEISMOLOGY > DSS SENSOR > GEOPHONE SENSOR > VERTICAL_COMPONENT LAND AMPHIBIOUS SEG-Y_DATA_FORMAT MINISEED_DATA_FORMAT SEISMIC_WAVEFORM_DATA CONTROLLED_SOURCE_SEISMOLOGY > RAW_DATA EARTH SCIENCE > SOLID EARTH EARTH SCIENCE > SOLID EARTH > TECTONICS > EARTHQUAKES > SEISMIC PROFILE In Situ/Laboratory Instruments > Profilers/Sounders > SEISMIC REFLECTION PROFILERS Gipp Support Team GFZ German Research Centre for Geosciences, Potsdam, Germany Dataset 10.2312/GFZ.b103-14122 https://seg.org/Portals/0/SEG/News%20and%20Resources/Technical%20Standards/seg_y_rev0.pdf http://www.fdsn.org/pdf/SEEDManual_V2.4.pdf 10.17815/jlsrf-2-128 https://www.gfz-potsdam.de/gipp CC BY 4.0 Seismic Data, including raw, MSEED and SEG-Y files, of the large-scale controlled-source survey in Northern Namibia (Kaokoveld) using combined on- and offshore experiments.

Passive continental margins offer the unique opportunity to study the processes involved in continental extension and break up as well as the role of hot-spot related magmatism. We conducted combined on- and offshore seismic experiments in Northern Namibia designed to characterize the Southern African passive margin at the interaction with the Walvis Ridge, to assess the interaction of the presumed plume with continental lithosphere and to determine the deep structure of the transition from the coastal fold belt to the stable craton, where the Walvis Ridge hits the African continent. The seismic project integrated three experiments, an onshore, coast-parallel refraction seismic profile, two onshore-offshore wide-angle seismic transects, and a combined on- and offshore seismic experiment to image the sub-Moho velocity (Pn tomography) at the ocean-continent transition. The knowledge of the lithospheric structure of the margin together with results from other geoscientific studies (e.g., conducted within the SPP- SAMPLE, DFG Priority Program 1375, South Atlantic Margin Processes and Links with onshore Evolution) will help to address fundamental questions such as, how continental crust and plume head interact, what the extent and volumes of magmatic underplating is, and how and which inherited (continental) structures might have been involved and utilized in the break-up process.

Between November 2010 and January 2011, we conducted an extensive seismic experiment in Northern Namiba, in the Kaokoveld. Along 3 seismic lines with a total length of more than 900 km, we deployed 200 seismic sensors and data loggers. The average spacing of the instruments was ~3 km along the coast-parallel line and ~6 km along the other lines, running NE- SW and SE-NW. The data loggers had been equipped with a short-period seismic sensor, recording the vertical ground motion and a battery pack, suitable for continuous data recording of >6 weeks. The instruments were placed in shallow holes and covered by sand, leaving the logger surface clear for GPS reception. At the eastern ends of the lines, the instruments were deployed in somewhat hidden places to avoid instrument damage or theft.

The Geophysical Instrument Pool Potsdam (GIPP) provides field instruments for (temporary) seismological studies (both controlled source and earthquake seismology) and for magnetotelluric (electromagnetic) experiments. The GIPP is operated by the GFZ German Research Centre for Geosciences. The instrument facility is open for academic use. Instrument applications are evaluated and ranked by an external steering board. See Haberland and Ritter (2016) and https://www.gfz-potsdam.de/gipp for more information.
LISPWAL_NE_SW Profile 12.4688 14.8932 -18.9253 -17.8463 LISPWAL_NW_SE Profile 12.4005 15.0017 -19.6521 -18.7184 LISPWAL_coast_parallel Profile 12.1516 13.4944 -19.8315 -17.2106 Geophysical Instrument Pool Potsdam GIPP201019 Deutsche Forschungsgemeinschaft http://doi.org/10.13039/501100001659 SPP 1375 South Atlantic Margin Processes and Links with onshore Evolution Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ http://doi.org/10.13039/501100010956