Erratum to the KHC Seismic Station: The Birthplace of Broadband Seismology

0537197 - GFÚ 2022 US eng J - Journal Article
Kolář, Petr
Erratum to the KHC Seismic Station: The Birthplace of Broadband Seismology.
Seismological Research Letters. Roč. 92, 2A (2021), s. 1202-1204. ISSN 0895-0695. E-ISSN 1938-2057
Institutional support: RVO:67985530
Keywords : very broadband seismology * history of KHC seismic station * recording of unbiased seismograms
OECD category: Volcanology
Impact factor: 4.288, year: 2021
Method of publishing: Limited access

In Kolář (2020), we described the history of very broadband seismology (VBB) with special regard to the outstanding role of the seismic station Kašperské Hory (KHC, Czech Republic). A recent message from a reader mentioned that a comparison of VBB output and output recorded by a standard method at the time would be beneficial. We fully agree with this comment. As such, two examples have now been added to demonstrate the advantages of the VBB system. Both of the examples were obtained from Plešinger and Horálek (1976), in which the new VBB system was introduced for the first time and other examples can also be found. Figure 1 presents various records of the 28 February 1973 magnitude 6.8 Kurile Islands earthquake (recorded at the KHC station; epicentral distance about 8.700 km). The richness of detail in the VBB record in comparison to the non-VBB record is obvious. Here, the non-VBB records were simulated by filtering the original VBB record using the frequency responses of standard types of seismometers (the frequency responses are presented in fig. 3 of Kolář, 2020). Figure 2 shows the influence of instrument frequency response on the determination of signal first onset time(s) from the corresponding record. Interpretation from the VBB record is compared with a record using simulated non-VBB records (obtained by filtering the original VBB record). For the non-VBB record case, times of the offset are delayed; the delay increases when the filter becomes narrower. Both figures clearly demonstrate the power of the VBB system in comparison to past standard seismogram recordings.
Permanent Link: http://hdl.handle.net/11104/0314937