Title: Cleaning the Dirty Lens: How the Crust Affects Measurements of the Deep Earth.
Abstract: Seismic waves recorded at the Earth’s surface can reveal small-scale structures in the deep Earth by detecting how the waves scatter. The energy from the scattered waves is often small but by combining data from multiple seismometers (called an array), we can detect and map the source of heterogeneity, known as scatterers. However, near-surface structures, particularly variations in crustal thickness, can distort the wavefronts before they reach the array. In this talk, I show that these shallow structures can shift the apparent direction of incoming waves, potentially leading to large errors in locating scatterers. Correcting for these effects is essential for accurate imaging of the Earth’s interior.
Biography: Shubh is a postdoctoral scholar at the University of South Carolina. He is a seismologist and spends most of his time looking at seismograms. His research explores how seismic waves can help us understand the Earth’s structure and its dynamic processes, from the shallow crust to the deep mantle. He primarily works with broadband seismic data, combining observational tools and forward modeling to extract signals that reveal what’s happening beneath our feet. In his free time, he is often outdoors, running or climbing, or enjoying some brewed goodness with a book.
To join virtually: Zoom
Contact: SAGRAWAL@mailbox.sc.edu
Website: https://wa-v-es.github.io/
Recording: Zoom Recording (will be available within a week after the seminar)