Crustal imaging across the North Anatolian Fault Zone from the autocorrelation of ambient seismic noise

Seismic images of active fault zones can be used to examine the structure of faults throughout the crust and upper mantle and give clues as to whether the associated deformation occurs within a narrow shear zone or is broadly distributed through the lower crust. Limitations on seismic resolution wit...

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Bibliographic Details
Published inGeophysical research letters Vol. 43; no. 6; pp. 2502 - 2509
Main Authors Taylor, George, Rost, Sebastian, Houseman, Gregory
Format Journal Article
LanguageEnglish
Published Washington John Wiley & Sons, Inc 28.03.2016
Subjects
Ambient noise
Autocorrelation
crustal structure
Crusts
Data processing
Deformation
Earth mantle
Fault lines
Fault zones
Faults
Geological faults
Imaging
Imaging techniques
interferometry
Magma
Mantle
Marine
Moho
Noise
Noise prediction
North Anatolian Fault
Phase coherence
Profiles
Reflection
seismology
Shear
Shear zone
Structures
Upper mantle
Wave reflection
North Anatolian Fault
INW, North Pacific, Kuroshio Extension Current, Northern Branch
MED, Aegean Sea, North Anatolian Fault
MED, Marmara Sea, North Anatolian Fault Zone
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Summary:Seismic images of active fault zones can be used to examine the structure of faults throughout the crust and upper mantle and give clues as to whether the associated deformation occurs within a narrow shear zone or is broadly distributed through the lower crust. Limitations on seismic resolution within the crust and difficulties imaging shallow structures such as the crust‐mantle boundary (Moho) place constraints on the interpretation of seismic images. In this study we retrieve body wave reflections from autocorrelations of ambient seismic noise. The instantaneous phase coherence autocorrelations allow unprecedented ambient noise images of the North Anatolian Fault Zone (NAFZ). Our reflection profiles show a Moho reflected P wave and additional structure within the crust and upper mantle. We image a distinct vertical offset of the Moho associated with the northern branch of the NAFZ indicating that deformation related to the fault remains narrow in the upper mantle. Key Points Retrieval of body waves from ambient seismic noise is possible by autocorrelating noise records Deformation associated with the North Anatolian Fault occurs within a localized narrow shear zone We see evidence of the Hales discontinuity in the upper mantle beneath the North Anatolian Fault
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ISSN:0094-8276
1944-8007
DOI:10.1002/2016GL067715