Associate Professor Yingjie Yang presents a seminar on multi-scale seismic imaging of subsurface structures using background noise

Seismic tomography is the main technique to image the subsurface structure of the Earth across a range of scales. Conventional seismic tomography exploits the seismic waves emitted by earthquakes. However, because most large earthquakes occur at plate boundaries and most continents, including Australia, are not seismically active, earthquake-based tomography suffers from uneven distributions of earthquakes and has difficulties in deciphering fine-scale structures of the Earth in seismically quiet continents.

In the past decade or so, the advent of ambient noise tomography (ANT), which exploits diffuse background seismic energy from ocean waves, has revolutionized seismic tomography because it can overcome the limitations of conventional earthquake surface wave tomography. In this presentation, I will first introduce the physical theory of ANT and then demonstrate the applications of ANT to address various environmental and geological questions by mapping fine-scale structures from the shallow surface to the deep upper mantle.

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