Data Services Products: EMC-QRLW8 A global upper mantle shear wave attenuation model

Summary

A degree 8 3-D Q model of the upper mantle by Gung and Romanowicz (2004) , derived from three component surface waveform data in the period range of 60-400 seconds. Model is parameterized in spherical harmonics for lateral variations and cubic b-splines for depth dependence up to maximum spherical harmonics degree 16 horizontally for the SV-velocity model and 8 for the Q model with the use of 16 B-splines vertically (throughout the mantle). The velocity model is expressed as perturbations from the spherically symmetric model PREM .

Description

Name QRLW8
Title A global upper mantle shear wave attenuation model
Type 3-D Q Model
Sub Type Shear wave attenuation
Year 2002
Short Description   A degree 8 three-dimensional Q model of the upper mantle, derived from three component surface waveform data in the period range 60-400 sec.
Authors:  
Yuancheng Gung
Berkeley Seismological Laboratory
University of California, Berkeley
Barbara Romanowicz
Berkeley Seismological Laboratory
University of California, Berkeley
Previous Model
Reference Model
Model Download QRLW8_model.tar (~65 kB), source code and executable for QA1grid to output model value for a given depth, latitude and longitude. The unit of the output value is d(1/2Q)x1000 with respect to QL6c.1D model that is also included in the package.
Model Homepage seismo.berkeley.edu/~gung/_QRLW8/Qrlw8.html
Depth Coverage Upper Mantle (80 to 670 km)
Areal Coverage Global ( -90°/90°, 0°/360°)
 
Data Set Description Three-component surface waveform data in the period range 60-400s

model QRLW8 as derived from three-component data

Figure, Gung and Romanowicz (2004) , shows model QRLW8 as derived from three-component data. Black dots are hotspots according to the list by Richards, Hager and Sleep (1988) .

Citation

  • Gung, Y. and B. Romanowicz. 2004. “Q tomography of the upper mantle using three-component long-period waveforms.” Geophysical Journal International, 157:813-830.
  • Trabant, C., A. R. Hutko, M. Bahavar, R. Karstens, T. Ahern and R. Aster (2012), Data products at the IRIS DMC: stepping-stones for research and other application, Seismological Research Letters, 83(6), 846:854. doi: 10.1785/0220 120032

References

  • Richards, M.A., B.H. Hager, and N.H. Sleep. 1988. “Dynamically supported geoid highs over hotspots: Observation and theory.” J. Geophys. Res. 93:7690-7780.

Credits

  • Y. Gung and B. Romanowicz

DOI

There is no DOI currently assigned for this product.

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