Romanian Seismic Network Since 1980 to the Present

Popa, Mihaela; Rădulian, Mircea; Ghica, Daniela; Neagoe, Cristian; Nastase, Eduard

doi:10.1007/978-3-319-14328-6_9

Cited by 11 publications

(2 citation statements)

References 3 publications

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“…As documented by [23], the 1940 M7.7 Vrancea earthquake marks an important moment for the development of seismological observations in Romania, with seven permanent observatories being installed by 1952, six of them within less than 200 km from the Vrancea region. Another pivotal moment is represented by the occurrence of the 1977 M7.4 Vrancea earthquake: after this large event, additional seismic stations were installed and pre-existing ones were modernized [24], leading to the establishment between 1980-1982 of the first Romanian telemetry seismic network, consisting of 18 short-period seismic stations [25]. In the 1990s and afterwards, the Romanian seismic network has continued to develop and modernize [26]; besides the shortperiod seismic stations, the network included by the end of 2013 at least a dozen broad-band seismic stations surrounding the Vrancea region [25].…”

Section: Methodsmentioning

confidence: 99%

“…Another pivotal moment is represented by the occurrence of the 1977 M7.4 Vrancea earthquake: after this large event, additional seismic stations were installed and pre-existing ones were modernized [24], leading to the establishment between 1980-1982 of the first Romanian telemetry seismic network, consisting of 18 short-period seismic stations [25]. In the 1990s and afterwards, the Romanian seismic network has continued to develop and modernize [26]; besides the shortperiod seismic stations, the network included by the end of 2013 at least a dozen broad-band seismic stations surrounding the Vrancea region [25]. For the current status of Romania's and neighboring countries seismic networks, we refer to [27] (see also Supplementary Materials, Figure S1).…”

Section: Methodsmentioning

confidence: 99%

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Revisiting Vrancea (Romania) Intermediate-Depth Seismicity: Some Statistical Characteristics and Seismic Quiescence Testing

et al. 2023

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Background: The intermediate-depth seismicity in the Vrancea region (Romania) is characterized by localized and persistent earthquake activity that culminates about two or three times in a century with the occurrence of a large event (M ≥ 6.5). Here we have revisited some important seismicity characteristics, using earthquake catalog data spanning two different time periods: 1960–1999 and 2005–2013. Methods: we have determined the b-value of the frequency-magnitude distribution of earthquakes, using a maximum likelihood procedure, and estimated the parameter β to quantify anomalous seismicity rate decreases and increases. Results: by using data from the first period, we have confirmed the existence of a decreased b-value in the deepest part of the seismogenic zone; by using data from the second period, we have statistically confirmed the seismic quiescence that preceded the occurrence of the 1977 M7.4 Vrancea earthquake. Conclusions: the decreased b-value has been interpreted either in terms of an increased lithostatic stress with depth or as an indicator of the depth range where the next major Vrancea earthquake may occur. The time variation of the seismicity parameter β may reveal anomalous seismic quiescence and increased earthquake rates that may precede the occurrence of large earthquakes.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Revisiting Vrancea (Romania) Intermediate-Depth Seismicity: Some Statistical Characteristics and Seismic Quiescence Testing

et al. 2023

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Estimation of the effectiveness of the seismological network observations in the Carpathian region

Burmin

Shumlianska

2020

J Seismol

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Spatial analysis for an evaluation of monitoring networks: examples from the Italian seismic and accelerometric networks

et al. 2020

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In this work, we propose a statistical approach to evaluate the coverage of a network based on the spatial distribution of its nodes and the target information, including all those data related to the final objectives of the network itself. This statistical approach encompasses descriptive spatial statistics in combination with point pattern techniques. As case studies, we evaluate the spatial arrangements of the stations within the Italian National Seismic Network and the Italian Strong Motion Network. Seismic networks are essential tools for observing earthquakes and assessing seismic hazards, while strong motion (accelerometric) networks allow us to describe seismic shaking and to measure the expected effects on buildings and infrastructures. The capability of both networks is a function of an adequate number of optimally distributed stations. We compare the seismic network with the spatial distributions of historical and instrument seismicity and with the distribution of well-known seismogenic sources, and we compare the strong motion station distribution with seismic hazard maps and the population distribution. This simple and reliable methodological approach is able to provide quantitative information on the coverage of any type of network and is able to identify critical areas that require optimization and therefore address areas of future development.

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Romanian Seismic Network Since 1980 to the Present

Cited by 11 publications

References 3 publications

Revisiting Vrancea (Romania) Intermediate-Depth Seismicity: Some Statistical Characteristics and Seismic Quiescence Testing

Revisiting Vrancea (Romania) Intermediate-Depth Seismicity: Some Statistical Characteristics and Seismic Quiescence Testing

Estimation of the effectiveness of the seismological network observations in the Carpathian region

Spatial analysis for an evaluation of monitoring networks: examples from the Italian seismic and accelerometric networks

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