Understanding Non-Traditional Seismic Tsunami Hazards
Despite its intraplate and strike-slip source mechanism, the 2018 Palu earthquake had a large role in generating a deadly regional-scaled tsunami with run-up field measurements in excess of 4 m. In the Puget Sound and the Georgia Strait near Seattle, Washington, USA and Vancouver, British Columbia, Canada, paleoseismic investigations have begun to unearth shallow crustal faults which may be capable of generating locally damaging tsunami. Splay faults branching from the megathrust, normal faults in the outer rise, thrust faults in the accretionary wedge, strike slip events in plate interiors and seismic ground motion induced landsliding are all capable of generating tsunamis. Historically, however, the majority of tsunami modeling has focused exclusively on the shallow subduction interface. This can largely be attributed to past limits in computational power and our epistemic uncertainty in tsunamigenic processes. Advances in high-performance computing have eased the burden of running detailed and time-sensitive models, allowing for a richer view of seismic and tsunami source processes. Widespread attention, related to recent surprising earthquake and tsunami events, has increased capacity for studying an ever-expanding catalogue of faults and the cascading hazards that can result from their failure. Nevertheless, hazards from off-megathrust faults are currently underrepresented in traditional tsunami hazard assessments.
This session invites papers which aim to improve our limited understanding of the tsunamigenic impact beyond the shallow megathrust interface. Specifically, this session hopes to solicit studies using a broad range of geophysical, geological and oceanographic techniques to characterize non-traditional tsunamigenic processes, as well as estimate the risks imposed in terms of areal extent of impacts to populations and the built environment.
Conveners
Amy L. Williamson, University of Oregon (awillia5@uoregon.edu); Tiegan Hobbs, Natural Resources Canada (tiegan.hobbs@canada.ca); Valerie Sahakian, University of Oregon (vjs@uoregon.edu)
Oral Presentations
| Participant Role | Details | Start Time | Minutes | Action |
|---|---|---|---|---|
| Submission | Asteroids Impacting Earth’s Oceans: Tsunami Generation, Consequences on Coastlines and Potential Global Climate Effects | 02:30 PM | 15 | View |
| Submission | Forecasting the Impact of Tsunamis from the Alaska-Aleutian Subduction Zone in Southern California Under Rising Sea Levels | 02:45 PM | 15 | View |
| Submission | California Reviews Non-Traditional Tsunami Sources as Analogies for Future Statewide Tsunami Hazard Analyses | 03:00 PM | 15 | View |
| Submission | Lisbon 1755: A Tsunami Earthquake? | 03:15 PM | 15 | View |
| Submission | On the Origin of Tsunami Energy Upon Deformation of the Ocean Floor | 03:30 PM | 15 | View |
| Other Time | Break | 03:45 PM | 45 | |
| Submission | The 1810 Loreto Tsunami Triggered by Submarine Landslide in the Gulf of California, Mexico - Historical Evidence and Numerical Modeling | 04:30 PM | 15 | View |
| Submission | Hazard Constraints on Potentially Tsunamigenic Submarine Crustal Faults in the Northern Cascadia Forearc | 04:45 PM | 15 | View |
| Submission | Tsunamigenic Fault Sources in the Salish Sea, Washington State | 05:00 PM | 15 | View |
| Submission | Introducing Geodetic Locking to Stochastic Slip Rupture Models: An Example Application to Tsunami Hazard Analysis in Cascadia | 05:15 PM | 15 | View |
| Total: | 180 Minute(s) |
Understanding Non-Traditional Seismic Tsunami Hazards
Description