Digitized historical seismograms for the strongest earthquakes in western Romania (the South-Eastern edge of the Pannonian Basin)

Published: 3 January 2024| Version 1 | DOI: 10.17632/w5gx3w2wjb.1
Eugen Oros


A collection of digital waveforms seismograms scanned within the EUROSEISMOS 2002-2007 Project is presented. They recorded the strongest historical earthquakes produced in the western part of Romania where the country's most important seismotectonic risk zone with crustal earthquakes is located. The digitization of the scanned seismograms was done using the special program created by Pintore et al. (2005) within the Sismos Project called Teseo (Turn the Eldest Seismograms into the Electronic Original Ones). The characteristics of the instruments and the time corrections of seismograms used to develop the digital waveforms have been obtained from the seismograms, when possible, from the scanned bulletins available at: https://storing.ingv.it/ISS/index.html, https://storing.ingv.it/es_web/Data/Collection.htm, https://storing.ingv.it/es_web/Data/Collection.htm#Links (with links on the map for each seismic station), or the literature (published articles). For each studied earthquake, the digital seismograms are in SAC format ("sac files"). The response files for seismographs are in "response files". For each earthquake, there are presented a file with the Seisan method location (Havskov et al., 2020), web addresses showing interactive maps of the epicenters and the seismic stations that recorded them. For the earthquakes relocated outside the area of interest, we presented only the scanned seismograms, their study being done with data from bulletins. A docx file shows the Mw calculation details. These seismograms and digitized ones can be used exclusively for non-profit purposes and with the mention of their owner (NIEP Romania with credits for Dr. Oros Eugen) and the EuroSeismos and INGV Rome SISMOS Center projects. The first results obtained based on these digitized seismograms were presented by Eugen Oros in his doctoral thesis (2011), later published in a volume (2022) available at: http://librariascriitorilor.ro/Lectura/Cercetari%20privind%20hazardul%20seismic%20pentru%20Banat/index.html References - G. Ferrari and N.A. Pino (2003). EuroSeismos 2002-2003 a project for saving and studying historical seismograms in the Euro-Mediterranean area. Geophysical Research Abstracts, Vol. 5, 05274. - Michelini, A. and the Sismos Team (2005). Collection, digitization, and distribution of historical seismological data at INGV. EOS, 86(28). - Oros E. (2011). Seismic hazard research for Banat (in Romanian). PhD Thesis, University of Bucharest, Romania. Published at Sfantul Nicolae Publishing House, ISBN 978-606-30-4261-4 (2022). - Pintore S., Quintiliani M., Franceschi D. (2005) Teseo: a vectorizer of historical seismograms. Computers & Geosciences, 31, 10, 2005, 1277-1285. - Havskov J, Voss P.H, Ottemoller L. (2020). Seismological Observatory Software: 30 Yr of SEISAN. Seismological Research Letters, 91 (3): 1846-1852.


Steps to reproduce

The digital waveforms of the scanned historical seismograms were obtained in SAC format using Teseo software, a special program created by Pintore et al. (2005) within the Sismos INGV Rome Project. It is available together with the documentation at https://teseo.rm.ingv.it/ and https://github.com/INGV/teseo2. Then, they were elaborately processed, including the response files in pole-and-zero format, using Seisan software. The software Teseo has been developed for quick and accurate digitization of seismogram traces from raster files, introducing a vectorization step based on piecewise cubic Bézier curves. The vectoriser can handle greyscale images stored in a suitable file format and it offers three concurrent vectorization methods: manual, automatic by color selection, and automatic by neural networks - details in the work of Pintore et al. (2005).


Seismology, Romania, Database, Computational Seismology