Single Layer Recurrent Neural Network for detection of local swarm-like earthquakes-the application

0508961 - GFÚ 2020 RIV GB eng J - Journal Article
Doubravová, Jana - Horálek, Josef
Single Layer Recurrent Neural Network for detection of local swarm-like earthquakes-the application.
Geophysical Journal International. Roč. 219, č. 1 (2019), s. 672-689. ISSN 0956-540X. E-ISSN 1365-246X
R&D Projects: GA ČR(CZ) GA18-05053S; GA MŠMT(CZ) LM2015079; GA MŠMT(CZ) EF16_013/0001800
Institutional support: RVO:67985530
Keywords : neural networks * fuzzy logic * time-weries analysis * earthquake source observation
OECD category: Volcanology
Impact factor: 2.574, year: 2019
Method of publishing: Limited access
https://academic.oup.com/gji/article-abstract/219/1/672/5532359?redirectedFrom=fulltext

We present results of applying a local event detector based on artificial neural networks (ANNs) to two seismically active regions. The concept of ANNs enables us to recognize earthquake-like signals in seismograms because well-trained neural networks are characterized by the ability to generalize to unseen examples. This means that once the ANN is trained, in our case by few tens to hundreds of examples of local event seismograms, the algorithm can then recognize similar features in unknown records. The detailed description of the single-station detection, design and training of the ANN has been described in our previous paper. Here we show the practical application of our ANN to the same seismoactive region we used for its training, West Bohemia/Vogtland (border area Czechia-Saxony, local seismic network WEBNET), and to different seismogenic area, Reykjanes Peninsula (South-West Iceland, local seismic network REYKJANET). The training process requires carefully prepared data set which is preferably achieved by manual processing. Such data were available for the West Bohemia/Vogtland earthquake-swarm region, so we used them to train the ANN and test its performance. Due to the absence of completely manually processed activity for the Reykjanes Peninsula, we use the trained ANN for swarm-like activity in such a different tectonic setting. The application of a coincidence of the single-station detections helps to reduce significantly the number of undetected events as well as the number of false alarms. Setting up the minimum number of stations which are required to confirm an event detection enables us to choose the balance between minimum magnitude threshold and a number of false alarms.
Permanent Link: http://hdl.handle.net/11104/0299774