caa a22 4500 463172124 CHVBK 20180406164816.0 cr unu---uuuuu 170326e20070101xx s 000 0 eng 10.1007/s10950-006-9038-7 doi (NATIONALLICENCE)springer-10.1007/s10950-006-9038-7 Ivan Marian Department of Geophysics, University of Bucharest, 6 Traian Vuia str., 020956, Bucharest o.p.37, Romania aut Attenuation of P and pP waves in Vrancea area - Romania [Elektronische Daten] [Marian Ivan] The seismic attenuation in the Vrancea region (Romania) is investigated from teleseismic recordings of P and pP waves during the four major, intermediate-depth Romanian events that occurred since the onset of digital instrumentation. Most stations are located in Canada and in the United States, being equipped with a variety of sensors, especially short-period ones. The amplitude spectral ratio method is used, assuming no frequency dependence of the Q P factor in the range 0.2-2Hz. No apparent correlation between the derived attenuation value and the type of recording sensor is observed. Lateral variations of the attenuation are obtained, with a very low Q P area (values down to 33) located in the northwestern part of the Vrancea seismogenic volume. For the stations with different azimuth angles in relation to the epicentral area, Q P values routinely exceed 200. Most likely, the low attenuation values are related to an upwelling mantle material located immediately beneath the crust, but limited in depth to at least 100km. Springer Science+Business Media, Inc., 2006 attenuation nationallicence P and pP waves nationallicence spectral ratio nationallicence Q P factor nationallicence Vrancea (Romania) nationallicence Journal of Seismology Kluwer Academic Publishers 11/1(2007-01-01), 73-85 1383-4649 11:1<73 2007 11 10950 https://doi.org/10.1007/s10950-006-9038-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10950-006-9038-7 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Ivan Marian Department of Geophysics, University of Bucharest, 6 Traian Vuia str., 020956, Bucharest o.p.37, Romania aut NATIONALLICENCE 773 0- Journal of Seismology Kluwer Academic Publishers 11/1(2007-01-01), 73-85 1383-4649 11:1<73 2007 11 10950 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer