Mantle discontinuity structure beneath China

J. Revenaugh, S. A. Sipkin

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

Mantle reflectivity profiles obtained from long-period recordings of multiple-ScS reverberations from intermediate and deep-focus earthquakes surrounding China reveal remarkably sharp images of China deep structure. Regional inversion of the reflection coefficient of the 410-km discontinuity, R(410), reveals a pronounced high beneath Mongolia and north to northwestern China which is best explained by increased upper mantle olivine content, signifying extensive basalt depletion in a tectosphere that extends below the 410-km discontinuity. A low value of R(660) associated with topographic depression of the 660-km discontinuity beneath eastern Asia is consistent with a horizontally inclined slab atop the phase transition marking the seismic discontinuity. Two lower mantle reflectors (one beneath southern Honshu, Kyushu, and the Sea of Japan; the other below Shantung province (China) and the Yellow Sea) correlate with horizontally elongated velocity anomalies in western Pacific seismic tomography models. -from Authors

Original languageEnglish (US)
Pages (from-to)21,911-21,927
JournalJournal of Geophysical Research
Volume99
Issue numberB11
DOIs
StatePublished - 1994

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