scholarly journals Crustal structure of Iraq from receiver functions and surface wave dispersion: implications for understanding the deformation history of the Arabian-Eurasian collision

2008 ◽  
Vol 172 (3) ◽  
pp. 1179-1187 ◽  
Author(s):  
Rengin Gök ◽  
Hanan Mahdi ◽  
Haydar Al-Shukri ◽  
Arthur J. Rodgers
Keyword(s):  
Surface Wave ◽  
Crustal Structure ◽  
Wave Dispersion ◽  
Receiver Functions ◽  
Deformation History ◽  
Surface Wave Dispersion ◽  
History Of

Spurious low velocity zones in joint inversions of surface waves and receiver functions

2019 ◽  
Vol 219 (2) ◽  
pp. 1032-1042
Author(s):  
Chao Gao ◽  
Erin Cunningham ◽  
Vedran Lekić
Keyword(s):  
Surface Wave ◽  
Crustal Structure ◽  
Receiver Function ◽  
Model Space ◽  
Sedimentary Basins ◽  
Wave Dispersion ◽  
Receiver Functions ◽  
Low Velocity ◽  
Surface Wave Dispersion ◽  
Surface Wave Data

SUMMARY Low-velocity layers within the crust can indicate the presence of melt and lithologic differences with implications for crustal composition and formation. Seismic wave conversions and reverberations across the base of the crust or intracrustal discontinuities, analysed using the receiver function method, can be used to constrain crustal layering. This is commonly accomplished by inverting receiver functions jointly with surface wave dispersion. Recently, the proliferation of model-space search approaches has made this technique a workhorse of crustal seismology. We show that reverberations from shallow layers such as sedimentary basins produce spurious low-velocity zones when inverted for crustal structure with surface wave data of insufficiently high frequency. Therefore, reports of such layers in the literature based on inversions using receiver function data should be re-evaluated. We demonstrate that a simple resonance-removal filter can suppress these effects and yield reliable estimates of crustal structure, and advocate for its use in receiver-function based inversions.

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