Separation of source, site and near-surface attenuation effects in western Turkey

Kurtulmuş T. Ö., Akyol N.

NATURAL HAZARDS, cilt.77, sa.3, ss.1515-1532, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 77 Sayı: 3
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1007/s11069-015-1660-7
  • Dergi Adı: NATURAL HAZARDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1515-1532
  • Anahtar Kelimeler: Site function, Generalized inversion technique, Source function, Near-surface attenuation, Kappa parameter, Western Turkey, GROUND MOTION AMPLIFICATION, METAMORPHIC CORE COMPLEX, KUCUK-MENDERES-GRABEN, DECAY PARAMETER KAPPA, S-WAVES, SPECTRAL DECAY, SOUTHERN CALIFORNIA, RESPONSE ESTIMATION, LOCAL EARTHQUAKES, SHEAR-WAVES
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

We analyzed 1764 records from 322 micro- and moderate-size local earthquakes in the central west Turkey to separate source, site and near-surface attenuation effects by utilizing a generalized inversion technique (GIT) to the spectra. GIT site transfer functions were compared with horizontal-to-vertical spectral ratio (HVSR) estimates by Akyol et al. (Pure Appl Geophys 170(12):2107-2125. doi: 10.1007/s00024-013-0661-2, 2013). Large amplitude values of vertical component GIT site transfer functions were obtained at different frequency bands for some of the sites. These results imply contaminations of HVSR estimates due to basin geometry induced waves caused by deep or shallow lateral heterogeneities. GIT source function estimates were interpreted as Brune source model. Weak epicentral dependence of near-surface attenuation parameter kappa with large scattering could be attributed to the source and propagation path complexities along different paths arriving to the stations. Large f (e) values with large kappa (0) values emphasize near-surface weathered zones attenuation effect at high frequencies.