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

Mărmureanu Gheorghe; Borcia Ioan-Sorin; Mărmureanu Alexandru; Cioflan  Carmen Ortanza; Dragos Toma Danila; Ilieş Ion; Craiu George Marius; Stoian Irina

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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 Institutul de Geologie şi Seismologie,
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

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