Multi-scale anisotropy in NE China: Evidence for localized mantle upwelling

Han, Cunrui
Hammond, James O.S.
Ballmer, M.
Wei, W.
Xu, M.
Huang, Z.
Wang, L.

Publisher

Elsevier BV

Abstract

It is commonly proposed that the subduction of the Pacific plate has been responsible for widespread Holocene intraplate volcanism across NE China and the Korean Peninsula. Yet, how this process drives volcanism and even if it plays a critical role remains a topic of vigorous debate. In this study, using seismic data from four networks across NE China and northern Democratic People’s Republic of Korea (DPRK), we analyze shear wave splitting in converted P to S-waves at the Moho (Pms), S-waves from the subducted slab interface (local S), and SKS phases. The Pms phases show a relatively weak crustal anisotropy (<0.25 s), with fast polarization directions aligned sub-parallel to major tectonic features. For the local S and SKS phases, fast pol...