Incorporating Distributed Acoustic Sensing data in seismic network processing, an example from Sweden

The Swedish National Seismic Network (SNSN) in collaboration with the Swedish Transport Administration (STA) and Luleå University of Technology is currently studying how to incorporate DAS data from the railway system into the processing at the SNSN. A test data set consisting of both DAS and nodal data was collected in August 2024 along 15 km of railway passing the Kirunavaara underground iron mine in northernmost Sweden. During a three day period, the cable and instruments recorded blasts and induced events from the mine, as well as a more distant earthquake occurring along the Pärvie fault. Here we present analyses of the events using DAS data, a comparison of DAS and nodal data and various strategies to add DAS data to the SNSN processing. We will also discuss how data sharing between the Transport Administration and SNSN can be realized in future near real-time operations as the railway implements DAS technology.