IGPP Seminar Series 2022: Heiner Igel

IGPP is pleased to invite you to join its Fall 2022 Seminar Series presentation featuring University of Munich's Heiner Igel. Dr. Igel's talk, "Earth's Rock and Roll: Rotational Motions in Seismology" will be available via Zoom on Tuesday, June 7, 2022, starting at 12:00pm. Zoom: https://ucsd.zoom.us/j/91939223532?pwd=ZWtadCtZZnZBam1TQWhlK0dXeXh6Zz09 Password: SMM

Time: 12:00 pm, Pacific Time
Location: Revelle Conference Room

Abstract: 6C point measurements (i.e., three components of translations, three components of rotations) act like a classic seismic array with 3C sensors (thus interesting particularly in situations in which multiple sensors are difficult to install such as volcanoes, seafloor, boreholes, cities, buildings, planetary objects, etc).  6C data allow the estimation of phase velocities, propagation direction (even in anisotropic media), the separation of wave types, the tracking of seismic sources, the estimation of local subsurface structure, and the removal of tilt-contamination in classic seismometers. In addition, gradient-related observations (strain, rotation) are substantially more sensitive to near receiver structure (relevant for monitoring). In this talk we will report recent progress in applying these hitherto mostly theoretical concepts to real 6C observations including the ROMY ring laser in the Geophysical Observatory Munich as well as data recorded with the broadband rotation sensor BlueSeis-3A. Specific applications include 1) the determination of 1D local velocity structure in urban areas from ambient noise for site characterization, 2) tracking seismic energy generated by cars, (3) the estimation of a rotational low velocity model for planet Earth serving as a target for instrumentation development. We finally (4) we report on the determination of azimuth-dependent surface wave dispersion curves using array-derived rotation from the PFO seismic array.

Oct 4 2022 - 12:00pm to 1:00pm