| |
 |
UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:16 |
 |
|
|
|
Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Database management and development of instrumental recordings of historical earthquakes in Romania
Authors:
D. PAULESCU(1,2), Maria ROGOZEA(1), M. RADULIAN(1), Mihaela POPA(1)
Affiliation:
1)National Institute for Earth Physics, Măgurele, 077125, România
2)University of Bucharest, Faculty of Physics, Măgurele, 077125, România
E-mail
dpaulescu@infp.ro,mrogozea@infp.ro,mircea@infp.ro,mihaela@infp.ro
Keywords:
historical seismograms, database, digitization
Abstract:
The aim of this paper is to present how a database with historical analogue seismograms is organized in order to their digitization as a source of high quality seismological data. We propose and describe a managing system for a unique seismological Romanian database of historical seismograms and complementary documentation (metadata) and its dissemination and analysis procedure. For this study, 5188 historical seismograms recorded between 1903 and 1957 by the Romanian seismological observatories (Bucharest-Filaret, Focșani, Bacău, Vrincioaia, Câmpulung-Muscel, Iași) were used. In order to reconsider the historical instrumental data concerning the Romanian earthquakes, the main step of the procedure is the conversion of analog seismograms to digital images and digital waveforms (digitization/vectorialisation). First, we applied a careful scanning procedure of the seismograms and related material (seismic bulletins, station books, etc.). Second, the high resolution scanned seismograms of the significant Romanian earthquakes were processed to obtain the digital/numeric waveforms. We used a Colortrac Smartlf Cx40 scanner which provides images in TIFF or JPG format. For digitization we used the algorithm Teseo2 developed by the National Institute of Geophysics and Volcanology in Rome (Italy), within the framework of the SISMOS Project.
|
|
|
|