[ghsc-seminars] Seminar today in 30 minutes - Ed Nissen

[Mirus, Benjamin]

*Recent Earthquakes in New Zealand and Iran Highlight Challenges to Rupture
Forecasting*

*Ed Nissen*
*University of Victoria, Canada*

Earthquake rupture forecasts rely in part upon maps of active faults (from
geological or seismological studies) and estimates of interseismic strain
accumulation (normally from GPS). I will describe two recent earthquake
sequences that highlight important limitations to these rupture models. (1)
We use differential lidar to show how the Papatea Fault - one of the main
strands in the 2016 M7.8 Kaikoura earthquake, with >10 m surface slip -
 ruptured anelastically in response to neighbouring faulting. This shows
the potential for multimeter coseismic slip on faults which lack a
reservoir of interseismic strain and which would have been “invisible" to
GPS. (2) We use InSAR and seismology to characterize the December 2017
Hojedk sequence, a triplet of M6 earthquakes in eastern Iran. Of particular
interest is the third of these earthquakes, which was very shallow (0-3 km)
and generated >2 m surface slip on a fault that lacks any any surface
expression. Though these particular earthquakes occurred in a remote
region, tens of millions of people in Iran live on mountain-flanking
alluvial fans that could be underlain by similarly hidden faults.

*Monday, November 18th**, 2019*
*10-11am*
*  (Mountain Time)*
*USGS, 1711 Illinois Street, Golden, CO*
*Entry Level Seminar Room (204)*

*Note: Please arrive *~5 minutes early* and *bring photo ID* for
airport-style security measures now in place at the USGS building.

Thank you,
GHSC Seminar Committee

Ben
Mirus - bbmirus at usgs.gov
Josh Rigler - erigler at usgs.gov
Oliver Boyd - olboyd at usgs.gov <oboyd at usgs.gov>
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