Danielle Sumy
2019-02-27 15:59:13
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<at>iris.edu
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<at>iris.edu
