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Abstract

Summary

The Vrancea seismic zone is located beneath the Eastern Carpathians in Romania and characterized by persistent, well-confined seismicity. The main seismic activity occurs at intermediate depth (60 - 180 km). The purpose of this study is to explore a possible seismic gap of seismicity, similar to that reported by Marza (1979) before the 1977 Mw 7.2 Vrancea earthquake. The earthquake data is provided by the ROMPLUS earthquake catalogue (Oncescu et al., 1999 – updated).

The results of the analysis show a clear decrease in the number of Vrancea earthquakes (Mw >= 2.5) with depths below 150 km, starting in the year 2014. The number of recording seismic stations in the eastern part of Romania, as well as in and around the Vrancea region, does not change significantly in 2014, so the decrease in the number of deep events may not be related with the station coverage. Further exploration is, however, necessary. We have also found some intriguing changes of hypocentral depth, for the same earthquake, when comparing the output of the Early Warning System (EWS), automatic and manual locations. We will further analyze the reasons behind these changes and confirm whether the current seismic gap is genuine or not.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.202149BGS57
2021-10-10
2024-04-28

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References

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.202149BGS57
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A Possible Seismic gap in Vrancea (Romania) Zone at Depths below 150km
Conference Proceedings 2021, 1 (2021); https://doi.org/10.3997/2214-4609.202149BGS57
/content/papers/10.3997/2214-4609.202149BGS57
/content/papers/10.3997/2214-4609.202149BGS57
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