Global‐phase seismic interferometry unveils P‐wave reflectivity below the Himalayas and Tibet

Abstract

A number of seismic methods exist to image the lithosphere below a collection of receivers, using distant earthquakes. In the current practice, especially mode‐conversions in teleseismic phases are utilized. We present a new method that takes advantage of the availability of global phases. This method is called global‐phase seismic interferometry (GloPSI). With GloPSI, zero‐offset reflections are extracted from reverberations near the array caused by global seismicity. We exemplify GloPSI with data from the Hi‐CLIMB experiment (2002–2005) and migrate the obtained reflection responses. This results in a 800 km long reflectivity profile through the Himalayas and a large part of the Tibetan Plateau.