Comparison of earthquake swarm detection methods: Case study at Mór Graben, Hungary

The seismicity of the Pannonian Basin can be described as moderate. The study area is located in the northern part of the Pannonian Basin, which is one of the most active area in terms of earthquakes.

We found that earthquake swarms occur in the Mór graben quite regularly. The Kövesligethy Radó Seismological Observatory deployed three temporary stations in the graben to monitor the local seismicity, and these stations operated for ca. 20 months. We can study the very small magnitude events because the detection capability is more sensitive from 2020.

After relocating the events with a multiple-event location algorithm, we compare three different real swarm detection methods based on the filtered three-component waveforms, to find the best one to collect a complete swarm event list in the Mór Graben.

Using the temporary and permanent stations of the Kövesligethy Radó Seismological Observatory and the GeoRisk Ltd. networks we can identify more than a hundred swarms with small magnitudes.

Our results show that the Mór Graben is still active, where some of the largest earthquakes occurred in Hungary in the past.