Larger peak ground accelerations in extra-Carpathian area than in epicenter
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MĂRMUREANU, Gheorghe; BORCIA, Ioan-Sorin; MĂRMUREANU, Alexandru; CIOFLAN , Carmen Ortanza; DRAGOS, Toma Danila; ILIEŞ, Ion; CRAIU, George Marius; STOIAN, Irina. Larger peak ground accelerations in extra-Carpathian area than in epicenter. In: Romanian Journal of Physics. 2020, nr. 5-6(65), pp. 1-10. ISSN 1221-146X.
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Romanian Journal of Physics
Numărul 5-6(65) / 2020 / ISSN 1221-146X

Larger peak ground accelerations in extra-Carpathian area than in epicenter


Pag. 1-10

Mărmureanu Gheorghe1, Borcia Ioan-Sorin2, Mărmureanu Alexandru1, Cioflan Carmen Ortanza1, Dragos Toma Danila1, Ilieş Ion3, Craiu George Marius1, Stoian Irina4
 
1 National Institute for Earth Physics, Bucharest,
2 National Institute for Research and Development in Construction, Urban Planning and Sustainable Spatial Development INCD URBAN-INCERC,
3 Institute of Geology and Seismology,
4 Romanian Geological Institute
 
Disponibil în IBN: 13 octombrie 2020


Rezumat

We report on peak ground accelerations (PGAs) recorded for three strong earthquakes in Vrancea, Romania (August 30, 1986, moment magnitude Mw = 7.1; depth h = 131.4 km; May 30, 1990, Mw = 6.9 depth 90.9 km; May 31, 1990, Mw = 6.4 depth 86.9 km & October 28, 2018, Mw = 5.5 depth 147.8 km). The PGAs increase with increasing epicentral distance, and then decrease for larger distances. These real data may be a new chalenge for the probabilistic seismic hazard studies or other methodologies, which take the epicentral PGA as a basic input parameter. To our knowledge, this phenomenom has not been reported elsewhere. Its spatial regularity leaves open the possibility of ascribing it to the soil particularities, like non-linearities. 

Cuvinte-cheie
Distance variability of the PGA, Spectral nonlinear amplification factors, Strong, Vrancea earthquakes