COMET Webinar - Tamarah King - 28 May 2020 - 16:00 UK time

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From: Daniel Juncu <D.Juncu@xxxxxxxxxxx>


Dear Colleagues,



The Centre for Observation and Modelling of Earthquakes, Volcanoes, and
Tectonics (COMET) invites you to the next instalment of our webinar series,
viewable from the home office.

Coming up next:


*Dr. Tamarah King *(University of Oxford)

*Movers and shakers down-under: what Australian surface ruptures tell us
about intraplate faults, seismic hazard, and reverse earthquake strong
ground motions. *


The webinar will take place on *Thursday the 28th of May 2020 at 16:00 UK
time* (GMT+1).



*If you want to attend the webinar please register
at https://us02web.zoom.us/webinar/register/WN_OOf9PjNwT1ylO6PTDUyyIQ
<https://us02web.zoom.us/webinar/register/WN_OOf9PjNwT1ylO6PTDUyyIQ>*

(After registering, you will receive a confirmation email containing
information on how to join the webinar)


*Abstract*

*Australian earthquakes offer unique opportunities to investigate surface
effects of reverse rupturing faults. Eleven historic surface-rupturing
earthquakes (MW 4.7 â?? 6.6) have occurred since 1968 in arid, low-relief,
bedrock dominated areas with little to no anthropogenic influence. These
events provide inputs for many intraplate and global scaling relationships,
yet remote-sensing techniques and reassessment of published historic data
raises questions regarding how to define fault length, offset and width
values, with implications for the accuracy of scaling relationships reliant
on these inputs. Available geological and geophysical data from ten of
these events indicate that rupture propagated parallel to the trace of, and
possibly along, pre-existing Precambrian bedrock structures, with no
unambiguous geological evidence for preceding surface-rupturing
earthquakes. The apparent lack of recurrence on historically rupturing
faults has implications for how â??activeâ?? faults and â??slip-ratesâ?? are
defined for seismic hazard analysis in intraplate stable continental
regions, and raises questions for how strain accumulates and dissipates in
these crustal settings. Finally, in the absence of near-field
instrumentation, the direction and distances of 1,437 co-seismically
displaced rock fragments (chips) provide a dense proxy-record of strong
ground motion directionality in the near-field of a MW 6.1 earthquake in
Central Australia.*


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End of Volcano Digest - 13 May 2020 to 15 May 2020 (#2020-50)
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