Upper mantle P-wave structure of the northwestern rim of the Pacific Ocean

Details Upper mantle P-wave structure of the northwestern rim of the Pacific Ocean Upper mantle P-wave structure of the northwestern rim of the Pacific Ocean

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mfsku..42...95s&link_type=abstract

Memoirs of the Faculty of Science, Kyoto University, Series of Physics, Astrophysics, Geophysics and Chemistry, (ISSN 0368-9689)

Astronomy and Astrophysics

Astrophysics

Earth Mantle: Structure

Scientific paper

We analyzed the first and secondary waves recorded by the seismic network of the Research Center to Earthquake Prediction of Hokkaido University to obtain the upper mantle P-wave structure of the northwestern rim of the Pacific Ocean. We made a data set of 67 earthquakes which occurred at depths shallower than 100 km along the Kuril-Aleutian Arc from April, 1985, to December, 1986. We obtained the one-dimensional P-wave structure which could explain the observations of both the travel time and slowness very well. No low velocity zone exists in the uppermost mantle, where the velocity increases with depth in the depth ranges of 33-95 km and 165-200 km and is constant in between. There are two transition zones where the velocity increases rapidly at depths of 400 km and 700 km and a minor transition zone at 460 km.

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