Abstract
Earthquake source mechanisms in onshore and offshore Nordland, northern Norway
Highlights
While the nature of earthquakes is not well understood in territories with complex geological and tectonic conditions, it is known that they generally occur along pre-existing zones of weakness and result from a buildup of stress and reduced effective shear strength along favourably oriented faults (e.g., Sibson, 1985)
Quality characterisation of earthquake focal mechanisms is generally conducted through a four-level alphabetical system where A stands for best quality and D for lowest quality results. e World Stress Map project (WSM, http://www.world-stress-map. org/) introduced a quality ranking based on Zoback & Zoback (1989), and the ranking has been improved over the years and most recently by Heidbach et al
We compiled a dataset of 152 focal mechanisms for Nordland, northern Norway, that consists of 123 newly obtained focal mechanisms from the NEONOR2 project and 39 focal mechanisms from earlier studies. e dataset is made available and presented here (Electronic Supplement 1) to help promote future investigations on this database
Summary
While the nature of earthquakes is not well understood in territories with complex geological and tectonic conditions, it is known that they generally occur along pre-existing zones of weakness and result from a buildup of stress and reduced effective shear strength along favourably oriented faults (e.g., Sibson, 1985) We use these perspectives in our current attempt to interpret new focal mechanism results for the Nordland region of northern Norway. In the frame of the project, from August 2013 to May 2016, along the coast of Nordland – from Rana ord in the south to Vesterålen in the north and in the Lofoten archipelago – a temporary network of 27 seismic stations was deployed alongside the permanent Norwegian National Seismic Network (NNSN; Fig. 1) Using data from both the temporary and the permanent deployments 1242 earthquakes were located in the study area, including an earthquake swarm.
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