23 May 2023
 | 23 May 2023
Status: this preprint is open for discussion.

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

Laurens Jan Hofman, Jörn Kummerow, Simone Cesca, and the AlpArray-Swath-D Working Group

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 Mc ∼ 1.0. The smallest detected and located events have a magnitude of Ml = −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.

Laurens Jan Hofman et al.

Status: open (until 08 Jul 2023)

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Laurens Jan Hofman et al.

Laurens Jan Hofman et al.


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Short summary
We present an earthquake catalogue for the Eastern and Southern alps, based on data from a local temporary monitoring network. The methods we developed for the detection and localisation focus especially on very small earthquakes. This provides insight in the local geology and tectonics and provides an important base for future research in this part of the Alps.