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

Peter Gaebler*, Tuna Eken, Hüseyin Önder Bektaş, Tom Eulenfeld, Ulrich Wegler, Tuncay Taymaz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)913-927
Number of pages15
JournalJournal of Seismology
Volume23
Issue number4
DOIs
Publication statusPublished - 15 Jul 2019

Bibliographical note

Publisher Copyright:
© 2019, The Author(s).

Funding

We highly appreciate the critical and helpful comments by the reviewers and thank the editor Mariano Garcia-Fernandez for handling the revision process. The python code used for carrying out the inverse modeling is available under the permissive MIT license and is distributed at https://github.com/trichter/qopen . The facilities of IRIS Data Services, and specifically the IRIS Data Management Center, were used for access to seismic waveforms, related metadata, and/or derived products used in this study. IRIS Data Services are funded through the Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation under Cooperative Agreement EAR-1261681. Tuna Eken and Tuncay Taymaz acknowledge financial support from Alexander von Humboldt Foundation (AvH) towards computational and peripherals resources.

FundersFunder number
National Science FoundationEAR-1261681
Alexander von Humboldt-Stiftung

    Keywords

    • Acoustic radiative transfer theory
    • Intrinsic and scattering attenuation
    • North Anatolian Fault Zone
    • Turkey

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