Abstract
The aim of this study is to collect information about events in the city of Oslo, Norway, that produce a seismic signature. In particular, we focus on blasts from the ongoing construction of tunnels and under-ground water storage facilities under populated areas in Oslo. We use seismic data recorded simultaneously on up to 11 Raspberry Shake sensors deployed between 2021 and 2023 to quickly detect, locate, and classify urban seismic events. We present a deep learning approach to first identify rare events and then to build an automatic classifier from those templates. For the first step, we employ an outlier detection method using auto-encoders trained on continuous background noise. We detect events using an STA/LTA trigger and apply the auto-encoder to those. Badly reconstructed signals are identified as outliers and subsequently located using their surface wave (Rg) signatures on the seismic network. In a second step, we train a supervised classifier using a Convolutional Neural Network to detect events similar to the identified blast signals. Our results show that up to 87% of about 1,900 confirmed blasts are detected and locatable in challenging background noise conditions. We demonstrate that a city can be monitored automatically and continuously for explosion events, which allows implementing an alert system for future smart city solutions.
Publisher
McGill University Library and Archives
Reference56 articles.
1. Al Nuaimi, E., Al Neyadi, H., Mohamed, N., & Al-Jaroodi, J. (2015). Applications of big data to smart cities. Journal of Internet Services and Applications, 6(1), 1–15. https://doi.org/10.1186/s13174-015-0041-5
2. Bergen, K. J., Chen, T., & Li, Z. (2019). Preface to the Focus Section on Machine Learning in Seismology. Seismological Research Letters, 90(2A), 477–480. https://doi.org/10.1785/0220190018
3. Bergen University, E. S. (2012). Operation of the Norwegian National Seismic Network 2011 [Techreport]. Department of Earth Science University of Bergen. https://nnsn.geo.uib.no/reports/2011/All_reports_2011.pdf
4. Beyreuther, M., Barsch, R., Krischer, L., Megies, T., Behr, Y., & Wassermann, J. (2010). ObsPy: A Python toolbox for seismology. Seismological Research Letters, 81(3), 530–533. https://doi.org/10.1785/gssrl.81.3.530
5. Bouchard, S., L’Heureux, J.-S., Johansson, J., Leroueil, S., & LeBoeuf, D. (2018). Blasting induced landslides in sensitive clays. In Landslides and Engineered Slopes. Experience, Theory and Practice (pp. 497–504). CRC Press.