Regional seismic wave attenuation in Northeast China

Study of regional seismic wave attenuation is an important aspect of global nuclear explosion monitoring and yield estimation. We studied, Pg and Lg seismic wave attenuation in Northeast (NE) China utilizing seismic data collected from 452 earthquakes that were recorded primarily by Northeast China Extended Seismic (NECESS) Array. A Pg attenuation map with an average Q$_{\mathrm{0}}$ of 299 was created at a central frequency of 1 Hz by implementing the Two Station Method (TSM). We observe low Pg Q$_{\mathrm{0}}$ values (\textless 400) in the majority of areas in NE china except in the central parts of the Songliao Basin and Great Xing'an Range. Lg attenuation is studied by implementing both TSM and Reverse Two Station Method (RTSM) at central frequencies of 0.5, 1, 2 and 3 Hz. Although both methods show similar frequency dependent factors ($\eta )$, RTSM method consistently shows higher Lg Q$_{\mathrm{0}}$ values compared to TSM. We observe most of the sedimentary basins in NE china show low Lg Q$_{\mathrm{0}}$ values (\textless 400) while granitic mountain ranges consistently show high Lg Q$_{\mathrm{0}}$ values (\textgreater 800).