Imaging of shear wave attenuation along the central part of the North Anatolian Fault Zone, Turkey


Gaebler P., Eken T. , Bektaş H. Ö. , Eulenfeld T., Wegler U., Taymaz T.

JOURNAL OF SEISMOLOGY, vol.23, no.4, pp.913-927, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 23 Issue: 4
  • Publication Date: 2019
  • Doi Number: 10.1007/s10950-019-09842-1
  • Title of Journal : JOURNAL OF SEISMOLOGY
  • Page Numbers: pp.913-927

Abstract

This study investigates the 2D-lateral distribution of frequency-dependent crustal seismic attenuation parameters beneath the central part of the North Anatolian Fault Zone in Turkey. Parameter estimations are based on an optimal fit between observed and synthetically computed seismogram envelopes in four different frequency bands (1.5 to 12 Hz). The forward modeling of the synthetic data relies on acoustic radiative transfer theory under the assumption of multiple isotropic scattering. Lateral variations of intrinsic and scattering attenuation clearly separate the main branch of the central part of the fault zone. Comparisons between intrinsic and scattering attenuation imply that seismic energy loss in the region of the central part of the North Anatolian Fault Zone is clearly dominated by the process of intrinsic attenuation. As a by-product of the inversion, moment magnitudes of the investigated events are calculated. Comparison of coda-derived magnitudes with magnitudes obtained from the earthquake catalog indicate that the analytical inversion approach can successfully be applied, even in this tectonically complex regime.