A New Seismicity Catalogue of the Eastern Alps Using the Temporary Swath-D Network

Abstract. We present a new, consistently processed seismicity catalogue for the Eastern and Southern Alps, based on the temporary dense Swath-D monitoring network. The final catalogue includes 6, 053 earthquakes for the time period 2017–2019 and has a magnitude of completeness of M_c ∼ 1.0. The smallest detected and located events have a magnitude of M_l = −0.5. Aimed at the low to moderate seismicity in the study region, we generated a multi-level, mostly automatic workflow which combines a priori information from local catalogues and waveform-based event detection, subsequent efficient GPU-based5 event search by template matching, P & S arrival time pick refinement and location in a regional 3-D velocity model.

The resulting seismicity distribution generally confirms the previously identified main seismically active domains, but provides increased resolution of the fault activity at depth. In particular, the high number of small events additionally detected by the template search contributes to a more dense catalogue, providing an important basis for future geological and tectonic studies in this complex part of the Alpine orogen.