## 6 Conclusions  
Analysis of geodetic and seismological data offered evidence for the occurrence of a M\({}_{\rm w}\) = 4.6 earthquake at a very shallow depth of approximately 2 km, near the city of Thiva (Boeotia, Central Greece). The mainshock and the aftershock sequence seems to have been caused by ruptures on or adjacent to the SW-dipping Kallithea fault. A shallow source, capable of causing a strong event over M = 5.0, so close to an urban area, i.e., Thiva, which is an economic and agricultural hub for Boeotia, should be better studied. Deployment of at least one backbone seismological and GNSS station nearby could greatly improve the depth resolution and better outline the mechanics of local faulting. There are multiple neotectonic structures in close proximity, including the larger Thiva fault. As past experience has taught us, faults with minor (or, even, no) seismic activity in recent times could still be the cause of strong and dangerous earthquakes [53]. Utilizing smaller seismic sequences to map potential sources is valuable for seismic hazard analysis; to improve the quality of such studies, we strongly suggest the integration of geodetic and seismological observations.  
Conceptualization, P.E., G.K. and I.P.; data curation, P.E.; formal analysis, P.E., I.S., A.K. and V.S.; investigation, P.E., I.S. and G.K.; methodology, P.E., I.S. and G.K.; project administration, G.K.; resources, P.E., G.K. and I.P.; software, P.E. and I.S.; supervision, P.E.; validation, P.E., I.S. and G.K.; visualization, P.E., I.S., A.K., T.G. and V.S.; writing--original draft, P.E., I.S., G.K. and V.S.; writing--review and editing, P.E., I.S., G.K. and I.P. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This research received no external funding.  
**Institutional Review Board Statement:** Not applicable.  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** Waveform data and station metadata are available from the EIDA node at GI-NOA ([[http://eida.gein.noa.gr/](http://eida.gein.noa.gr/)]([http://eida.gein.noa.gr/](http://eida.gein.noa.gr/)) accessed on 1 June 2021). The reviewed ISC bulletin can be accessed at [[http://www.isc.ac.uk/isclbulletin/search/](http://www.isc.ac.uk/isclbulletin/search/)]([http://www.isc.ac.uk/isclbulletin/search/](http://www.isc.ac.uk/isclbulletin/search/)) accessed on 1 June 2021. Initial event information and phase arrival data were obtained from NKUA-SL's catalogue ([[http://www.geophysics.geol.uoa.gr/stations/gmapv3_db/index.php?lang=en](http://www.geophysics.geol.uoa.gr/stations/gmapv3_db/index.php?lang=en)]([http://www.geophysics.geol.uoa.gr/stations/gmapv3_db/index.php?lang=en](http://www.geophysics.geol.uoa.gr/stations/gmapv3_db/index.php?lang=en)) accessed on 1 June 2021). Focal mechanism solutions of other research teams were acquired from the European and Mediterranean Seismological Center (EMSC; [[https://www.emsc-cesem.org/Earthquake/tensors.php](https://www.emsc-cesem.org/Earthquake/tensors.php)]([https://www.emsc-cesem.org/Earthquake/tensors.php](https://www.emsc-cesem.org/Earthquake/tensors.php)) accessed on 1 June 2021).  
**Acknowledgments:** The authors are grateful to the personnel of all institutes that collaborate in the operation of the Hellenic Unified Seismological Network. Sentinel-1 satellite imagery was acquired through the European Space Agency and Copernicus. THIV GNSS data were provided by Hexagon SmartNET. Figures 1, 5 and A6 were plotted with General Mapping Tools v.6.2 [54] and its Python wrapper PyGMT v.0.3.1 [55]. Figure A5 was plotted with Matplotlib [56]. Figures A7 and A8 were produced by ISOLA. The authors would like to thank the two reviewers for their constructive feedback on the initial manuscript.  
**Conflicts of Interest:** The authors declare no conflict of interest.