Strong Lg wave attenuation in the Northern and Eastern Tibetan Plateau measured by a two‐station/two‐event stacking method

The regional seismic phase, Lg , which involves shear wave reverberations in the crust, is strongly attenuated along propagation paths in northern and eastern Tibet. Robust estimates of the attenuation quality factor, Q Lg , in these regions are obtained using a two‐station, two‐event stacking method for broadband, vertical component Lg data in the passband 0.2–1.0 Hz. We find average 1 Hz Q Lg values, Q o , of 79 ± 4 in northern central Tibet and 119 ± 17 in eastern Tibet for the 0.2–0.5 Hz passband. Localized regions of eastern Tibet have Q o estimates ranging from 66 to 121. These results confirm and augment the spatial coverage of recent estimates of low Q o values in north central and south central Tibet, and support the notion of widespread partial melting of the crust throughout the Plateau.