Location: Faculty Hall
ACADEMY PUBLIC LECTURE
Jointly organized by the Indian Academy of Sciences & the Indian Institute of Science
Title : Representing Mega Earthquakes in the Laboratory: The discovery of Super-Shear, or Intersonic, Earthquake Ruptures
Directly studying earthquakes presents a host of insurmountable difficulties, the least of which are our inability to trigger earthquakes at will and to directly scrutinize their slip behavior at depth. The lecture describes the establishment of the concept of “Laboratory Earthquakes” as well as our experimental discovery of “super-shear” earthquake ruptures, whose speeds exceed the shear wave speed of crustal rock. We have developed techniques to produce surrogate laboratory earthquakes and to follow their progress with multiple, ultra-high-speed, imaging tools. Our laboratory quakes mimic actual ones, such as the devastating 1999 Izmit earthquake in Turkey and the 2002 Denali earthquake in Alaska and have allowed us to demonstrate that their ruptures indeed transitioned to “super-shear”. The propagating fronts of such “super-shear” ruptures feature a Mach-cone of shear shock waves similar to that of supersonic aircraft. By analyzing their special ground-shaking signatures, we explore their unexpected implications to the built environment.
Speaker’s Name : Ares J. Rosakis NAS, NAE.
Theodore von Kármán Professor of Aeronautics and Professor of Mechanical Engineering, California Institute of Technology, CA, USA
Professor Ares J. Rosakis received his B.A. and M.A. from Oxford University in 1978 and M.S. and Ph.D. from Brown University in 1983. He joined California Institute of Technology as an Assistant Professor of Aeronautics and Applied Mechanics in 1983. He is currently the Theodore von Kármán Professor of Aeronautics and Professor of Mechanical Engineering at Caltech. He has served as the Fifth Director of Graduate Aerospace Laboratories, GALCIT (2004-2009) and as the Dean of Division of Engineering and Applied Science (2009-2015). He has held several Distinguished Visiting Professorships at other universities such as École Normale Supérieure, Oxford, NTU (Singapore) and Northwestern University. He is a fellow of U.S. National Academy of Sciences, U.S. National Academy of Engineering, American Academy of Arts and Sciences, Academia Europaea, European Academy of Sciences and Arts, Academy of Athens, Commandeur dans l’Ordre des Palmes Académiques of France, American Society of Mechanical Engineers (ASME), and Society of Experimental Mechanics (SEM). He has also been recently elected as Foreign Fellow of Indian National Academy of Engineering. He has received several awards such as the Kingslake Medal (SPIE), Eringen Medal (SES), Von Karman Medal (ASCE) and Timoshenko Medal (ASME).
Date : 9 September 2019
Time : 11:00 AM – 12:00 PM
Venue : Faculty Hall, Indian Institute of Science, Bangalore
Prof. Roddam Narasimha, FASc, FRS, will chair.
Refreshments will be served before the lecture.
ALL ARE WELCOME
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