[CIG-ALL] IRIS WEBINAR: Fast rupture of the 2018 Mw 7.5 Palu earthquake - 02/27, 2 PM Eastern


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Please register for Fast rupture of the 2018 Mw 7.5 Palu earthquake on February 27, 2019 2:00 PM EST at:

https://attendee.gotowebinar.com/register/6121552275048621315

Presented by: Dr. Pablo Ampuero, Institut de Recherche pour le Développement (IRD), Université Côte d’Azur (UCA) and Caltech

Abstract: The 2018 magnitude 7.5 Palu, Indonesia, earthquake, which triggered liquefaction, landslides and a tsunami, was one of the most devastating earthquakes of 2018. The speed at which an earthquake rupture propagates affects its energy balance and ground shaking impact. Dynamic models of supershear earthquakes, which are faster than the speed of shear waves, often start at subshear speed and later run faster than Eshelby’s speed. Here we present robust evidence of an early and persistent supershear rupture at the sub-Eshelby speed of the 2018 magnitude 7.5 Palu, Indonesia, earthquake. Slowness-enhanced back-projection of teleseismic data provides a sharp image of the rupture process, along a path consistent with the surface rupture trace inferred by subpixel correlation of synthetic-aperture radar and satellite optical images. The rupture propagated at a sustained velocity of 4.1 km s–1 from its initiation to its end, despite large fault bends. The persistent supershear speed is further validated by seismological evidence of far-field Rayleigh Mach waves. The unusual features of this earthquake probe the connections between the rupture dynamics and fault structure. They may also offer a clue to understand why this earthquake was so damaging: did supershear rupture cause a cascade of effects, by inducing submarine landslides which in turn contributed to the tsunami?

After registering, you will receive a confirmation email containing information about joining the webinar. PLEASE NOTE: Registration does not confirm or guarantee you will have a spot during the webinar, as we are limited to 500 participants. Please hop on the webinar early for your best chances to see the webinar live. Remember that all IRIS webinars are archived for later viewing at https://www.youtube.com/playlist?list=PLD4D607C2FA317E6D

Any questions? Contact us at webinar@iris.edu