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How thick is the lithosphere?

H Kanamori¹, F Press

¹Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.

|April 25, 1970

Summary

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Lithospheric thickness, a key measure of tectonic plate structure, is estimated using seismic shear wave velocity data. New precise measurements suggest the oceanic lithosphere is approximately 70 kilometers thick.

Area of Science:

Geophysics
Seismology
Tectonics

Background:

The lithosphere's thickness is a critical parameter in understanding plate tectonics and mantle dynamics.
Previous methods for determining lithospheric thickness have limitations in precision and resolution.

Purpose of the Study:

To refine the estimation of suboceanic lithospheric thickness.
To investigate the relationship between shear velocity changes and lithospheric thickness.

Main Methods:

Analysis of seismic shear wave velocity data from the suboceanic mantle.
Utilizing new, highly precise group velocity data to constrain seismic models.

Main Results:

A rapid decrease in shear velocity was observed, indicating a specific boundary within the mantle.

Related Experiment Videos

The precise group velocity data strongly constrained seismic inversion solutions.

Conclusions:

The study implies a lithospheric thickness of approximately 70 km for the studied oceanic region.
High-precision seismic data significantly improves the accuracy of lithospheric thickness determinations.