|Conţinutul numărului revistei|
| SM ISO690:2012|
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.
|Romanian Journal of Physics|
|Numărul 5-6(65) / 2020 / ISSN 1221-146X|
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.
Distance variability of the PGA, Spectral nonlinear amplification factors, Strong, Vrancea earthquakes