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REFMC Catalogue
No full textThis focal mechanism catalogue (REFMC) was compiled by Mircea Radulian, Andrei Bălă and Dragoș Toma-Dănilă from the National Institute for Earth Physics (INFP), Romania (http://www.infp.ro/) and comprises of earthquakes in Romania, in the 1929 - 2012 period, for which we were able to compute or retrieve focal mechanism parameters.
If you use this catalogue in your work, beside the Mendeley Data citations please provide references to one of the following articles:
1. Radulian M., Bala A., Popescu E., Toma-Danila D. (2018) Earthquake mechanism and characterization of seismogenic zones in south-eastern part of Romania. Annals of Geophysics, 61(1), SE108.
2. Radulian M., Bala A., Ardeleanu L., Toma-Danila D., Petrescu L., Popescu E. (2019) Revised catalogue of earthquake mechanisms for the events occurred in Romania until the end of twentieth century: REFMC. Acta Geodaetica et Geophysica 54(1):3-18
REFMC Catalogue
No full textThis focal mechanism catalogue (REFMC) was compiled by Mircea Radulian, Andrei Bălă and Dragoș Toma-Dănilă from the National Institute for Earth Physics (INFP), Romania (http://www.infp.ro/) and comprises of earthquakes in Romania, in the 1929 - 2012 period, for which we were able to compute or retrieve focal mechanism parameters.
If you use this catalogue in your work, cite it as follows:
1. Radulian M., Bala A., Popescu E., Toma-Danila D. (2018) Earthquake mechanism and characterization of seismogenic zones in south-eastern part of Romania. Annals of Geophysics, 61(1), SE108.
2. Radulian M., Bala A., Ardeleanu L., Toma-Danila D., Petrescu L., Popescu E. (2019) Revised catalogue of earthquake mechanisms for the events occurred in Romania until the end of twentieth century: REFMC. Acta Geodaetica et Geophysica 54(1):3-18
REFMC Catalogue
No full textThis focal mechanism catalogue (REFMC) was compiled by Mircea Radulian, Andrei Bălă and Dragoș Toma-Dănilă from the National Institute for Earth Physics (INFP), Romania (http://www.infp.ro/) and comprises of earthquakes in Romania, in the 1929 - 2012 period, for which we were able to compute or retrieve focal mechanism parameters.
If you use this catalogue in your work, cite it as follows:
1. Radulian M., Bala A., Popescu E., Toma-Danila D. (2018) Earthquake mechanism and characterization of seismogenic zones in south-eastern part of Romania. Annals of Geophysics, 61(1), SE108.
2. Radulian M., Bala A., Ardeleanu L., Toma-Danila D., Petrescu L., Popescu E. (2019) Revised catalogue of earthquake mechanisms for the events occurred in Romania until the end of twentieth century: REFMC. Acta Geodaetica et Geophysica 54(1):3-18
REFMC 1929 - 2012 (Romanian Earthquake Focal Mechanism Catalogue)
No full textREFMC 1929 - 2012 (Romanian Earthquake Focal Mechanism Catalogue) was compiled by Mircea Radulian, Andrei Bălă and Dragoș Toma-Dănilă from the National Institute for Earth Physics (INFP), Romania (http://www.infp.ro/) and comprises of earthquakes in Romania, in the 1929 - 2012 period, for which we were able to compute or retrieve focal mechanism parameters. The catalogue divides earthquakes into two categories: crustal earthquakes (h < 50 km) and intermediate-depth earthquakes (h ≥ 50 km, all in the Vrancea area).
Information regarding the catalogue was published in two separate papers which we invite you to read and cite:
1. Radulian M., Bala A., Popescu E., Toma-Danila D. (2018) Earthquake mechanism and characterization of seismogenic zones in south-eastern part of Romania. Annals of Geophysics, 61(1), SE108.
2. Radulian M., Bala A., Ardeleanu L., Toma-Danila D., Petrescu L., Popescu E. (2019) Revised catalogue of earthquake mechanisms for the events occurred in Romania until the end of twentieth century: REFMC. Acta Geodaetica et Geophysica, 54, 1, 3-18.
If you download and use this catalogue in your work, beside the 2 citation given, please provide the reference of this complete catalogue presented here:
- Radulian, Mircea; Bala, Andrei; Toma-Danila, Dragos (2020), “REFMC 1929 2012 (Romanian Earthquake Focal Mechanism Catalogue) ”, Mendeley Data, V3, doi: 10.17632/mykkx4gygy.
Impact of Vrancea earthquakes on the security of Bucharest and other adjacent urban areas (ground motion modeling and intermediate-term prediction)
No full text
Microzonation of Bucharest: State-of-the-Art
No full textThe 1940 (Mw 1⁄4 7.7) and 1977 (Mw 1⁄4 7.4) Vrancea earthquakes (Romania) inflicted heavy damage and casualties in Bucharest and the statistics indicate a recurrence interval of 25 years for Mw ‡ 7.0 events. Under these circumstances, the seismic microzonation represents important information for detailed urban planning that establishes an appropriate level of preparedness to the earthquake threat. This paper reviews the main studies concerning the seismicity of the Vrancea region, the site conditions of the city, the characterization of the building stock, and the codes of practice that regulate the antiseismic design. The first-order microzonation of Bucharest was performed starting from the existing database of structural and geotechnical parameters. New insights originating from direct instrumental observation and interpretation of the local effects as well as realistic numerical modeling that update and improve the input data necessary for a detailed microzoning map of the city are also discussed
Seismic Hazard of Romania: Deterministic Approach
No full textThe seismic hazard of Romania is estimated in terms of peak-ground motion values— displacement, velocity, design ground acceleration (DGA)—computing complete synthetic seismograms, which are considered to be representative of the different seismogenic and structural zones of the country. The deterministic method addresses issues largely neglected in probabilistic hazard analysis, e.g., how crustal properties affect attenuation, since the ground motion parameters are not derived from overly simplified attenuation ‘‘functions,’’ but rather from synthetic time histories. The synthesis of the hazard is divided into two parts, one that of shallow-focus earthquakes, and the other, that of intermediate-focus events of the Vrancea region.
The previous hazard maps of Romania completely ignore the seismic activity in the southeastern part of the country (due to the seismic source of Shabla zone). For the Vrancea intermediate-depth earthquakes, which control the seismic hazard level over most of the territory, the comparison of the numerical results with the historically-based intensity map show significant differences. They could be due to possible structural or source properties not captured by our modeling, or to differences in the distribution of damageable buildings over the territory (meaning that future earthquakes can be more spectacularly damaging in regions other than those regions experiencing damage in the past). Since the deterministic modeling is highly sensitive to the source and path effects, it can be used to improve the seismological parameters of the historical events
Source scaling of intermediate-depth Vrancea earthquakes.
No full textSource scaling properties are studied for the intermediate-depth seismic nest in the Vrancea region, Romania, which has been the source of many destructive earthquakes. We investigate spectral and time-domain scaling properties using wide-band digital records from 16 earth- quakes (3.7 ≤ MW ≤ 7.4). All processing variants (P or S waves, spectral or time domain, etc.) produceconsistentresults.Theobservedcorner-frequencyversusMW trendgenerallyfollows the constant-stress-drop model, with typical stress-drop values of 1–10 MPa. This kind of scaling, seen over the entire magnitude range analysed, is similar to that observed for shallow events. However, this trend seems to be violated for the largest earthquakes (MW > 6.5). They show a clear tendency for higher static stress drops than shallow events, and for magnitudes above 7, average stress drops exceeding 10 MPa may be expected. These results are of partic- ular significance for seismic hazard studies, and specifically for the estimation of future strong motions
Source Parameters of Weak Crustal Earthquakes of the Vrancea Region from Short-period Waveform Inversion.
No full textHigh-frequency records of nine low magnitude shallow earthquakes of the Vrancea (Romania) seismic region are inverted for the seismic moment tensor (MT). An approach is suggested regarding how to obtain at least a rough estimate of the MT when the information on the structure of the crust is poor. Here simple 1-D layered models are used in the Green’s function synthesis despite the fact that the structure of the region is undoubtedly very complex. Different 1-D models were used for different source-station paths to approximate lateral variations. Record of a station located on a ray path which crosses a structure differing substantially from a 1-D model may however bias the retrieved MT essentially. Therefore, we did not collectively process all records, but subsets of stations separately. We check the consistency of the MTs resulting from these individual ‘‘bootstrap’’ solutions, and reject those which differ substantially, assuming that this is due to the oversimplification of the forward modeling. Thereafter, the averaged moment tensor yielded by the consistent subsets is accepted. Moreover, the distribution of the T, N and P axes from the moment tensors used for averaging provides a rough estimate of their reliability.
Following this simplistic procedure, we found seven acceptably constrained solutions among nine events processed. Their P axes are compared with the general trend of the stress in the area: three comply with it, the others should be attributed to the complex stress field active in the region
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