Preprints
https://doi.org/10.5194/essd-2020-369
https://doi.org/10.5194/essd-2020-369

  08 Jan 2021

08 Jan 2021

Review status: this preprint is currently under review for the journal ESSD.

A focal mechanism catalogue of earthquakes that occurred in the southeastern Alps and surrounding areas from 1928–2019

Angela Saraò1, Monica Sugan1, Gianni Bressan1, Gianfranco Renner1, and Andrea Restivo1, Angela Saraò et al.
  • 1Istituto Nazionale di Oceanografia e Geofisica Sperimentale – OGS, Trieste, Italy
  • deceased, Andrea Restivo on 24 August 2020

Abstract. We present a focal mechanism catalogue of earthquakes that occurred in the southeastern Alps and surrounding areas from 1928 to 2019. The area involved in the process of convergence between the Adria microplate and Eurasia is one of the most seismically active regions in the Alpine Belt. The seismicity is minor, with the Ms =thinsp;6.5 Friuli earthquake being the strongest event recorded in the area, but the seismic hazard is relevant because it is a highly populated region. For this reason, numerous studies have been carried out over time to investigate the stress field and the geodynamic characteristics of the region using focal mechanisms. To provide a comprehensive set of revised information, which is challenging to build quickly because the data is dispersed over many papers, we collected and revised the focal mechanisms that were previously published in the literature. Additionally, depending on the data quality and availability, we computed new focal mechanisms by first arrival polarity inversion or seismic moment tensor. Finally, we merged all the fault plane solutions to obtain a catalogue for a selection of 772 earthquakes with 1.8thinsp;≤thinsp;Mthinsp;≤thinsp;6.5. For each earthquake, we reported all the available focal mechanisms obtained by different authors. However, we also suggested a preferred solution for users who need expeditious information. The catalogue is available at https://doi.org/10.5281/zenodo.4284971 (Saraò et al., 2020).

Angela Saraò et al.

Status: open (until 05 Mar 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Angela Saraò et al.

Data sets

Focal mechanisms of the Southeastern Alps and surroundings (Version 1.0) A. Saraò, M. Sugan, G. Bressan, G. Renner, and A. Restivo https://doi.org/10.5281/zenodo.4284971

Angela Saraò et al.

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Short summary
The focal mechanisms describe the orientation of the fault on which an earthquake occurs and the slip's direction. They are necessary to understand seismotectonic processes, and for seismic hazard analysis. We present a focal mechanism catalogue of 772 selected earthquakes 1.8 ≤ M ≤ 6.5 that occurred in the southeastern Alps and surrounding areas from 1928 to 2019. For each earthquake, we report focal mechanisms by literature and new computed solutions and we suggest a preferred one.