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Amplitude-corrected receiver function imaging for a dipping interface
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DOI：10.1093/gji/ggaf391.png)
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Abstract
En 中文
We developed a new amplitude correction method for receiver function imaging to analyse velocity contrasts along dipping interfaces. Because receiver function imaging typically assumes a horizontally layered structure, corrections are needed for amplitude and polarity variations of P-to-S converted phases when analysing dipping interfaces. However, previous studies have not adequately addressed these effects, and improved receiver function analysis is required to better delineate dipping structures, such as subducting plate surfaces and the oceanic Moho. Therefore, we propose formulae that quantify converted S-wave amplitude variations between horizontal and dipping interfaces. This relationship is expressed as a function of the backazimuth, the ray parameter of an incident P wave and the dip angle and dip direction of a dipping interface, and in this study, the geometry of the dipping interface (dip angle and dip direction) is assumed. We applied these formulae to receiver function imaging using synthetic and observed data and confirmed that the amplitude of seismic discontinuities was successfully reproduced. This method enables the use of numerous receiver functions regardless of the backazimuths of incident P waves, thereby providing more detailed amplitude estimations for dipping interfaces.
Keywords:
Time-series analysis
Body wave
Wave propagation
Dynamics of lithosphere and mantle
Subduction zone processes
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