Automatic Anomaly Detection for Swarm Observations
Yaxin Bi, Vyron Christodoulou, George Wilkie, Guoze Zhao, Peter Nicholl, Huang, M; id_orcid 0000-0003-4377-0059, Bin Han, Ji Tang · Ulster University Research Portal (Ulster University) · 2021
The Swarm satellite mission was launched on 22 November 2013, it is the first European Space Agency’s constellation of three satellites, dedicated to monitoring geomagnetic field changes. The measurements delivered by the three satellites are very valuable for a range of applications, including the earthquake prediction study. However, for more than 5 years, relatively little advancement has been achieved in establishing a systematic approach for detecting anomalies from the satellite measurements for predicting earthquakes. This paper presents the challenges of developing a pragmatic framework for automatic anomaly detection and highlights innovative features of functional components developed. Through a case study we demonstrate a functionality pipeline of the system in detecting anomalies, and present our solutions to coping with data sparsity and parameter tuning as well as insights into the differences between discovering seismic anomalies from periodic and non-periodic data observed by the Swarm satellites.