Sedimentary basins can strongly amplify seismic waves from earthquakes.
To better predict strong ground motions, thorough knowledge of sediment
thickness and internal basin structure is required. This study maps the
deep and complex bedrock shape of the Kanto Basin, Japan, using ambient
seismic noise and earthquake autocorrelation functions (ACFs). Noise
ACFs are computed using one month of continuous data recorded by the
vertical component of 287 MeSO-net stations located in the greater Tokyo
area. Earthquake ACFs are obtained from the P-wave records at the
MeSO-net stations of 50 Mw 6+ teleseismic earthquakes. Both noise and
earthquake ACFs exhibit great similarity in P-wave reflections,
confirming that the same wavefield is extracted with both methods. We
finally map the basin bedrock geometry and find that it is comparable
with that from an existing 3-D velocity model.