Recent paleoseismicity record in Prince William Sound, Alaska, USA

Kuehl, Steven A.; Miller, Eric J; Marshall, Nicole R.; Dellapenna, Timothy M.

doi:10.1007/s00367-017-0505-7

Cited by 5 publications

(3 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unit I is usually not present beneath the shallow shelf region, and it is commonly 10 to 30 m thick in the Junken Trough and other cross-trough regions along the Gulf of Alaska (e.g., Carlson, 1989). We interpret this unit as related to the millennial-scale deposition of fine-grained, suspended sediment derived primarily from the Copper River delta (Jaeger et al, 1998;Kuehl et al, 2017).…”

Section: Methods and Datamentioning

confidence: 93%

“…With our data set, we identify three seismic stratigraphic packages above acoustic basement (Figures 3 and S2 to S5). We interpret this unit as related to the millennial-scale deposition of fine-grained, suspended sediment derived primarily from the Copper River delta (Jaeger et al, 1998;Kuehl et al, 2017). Unit I is usually not present beneath the shallow shelf region, and it is commonly 10 to 30 m thick in the Junken Trough and other cross-trough regions along the Gulf of Alaska (e.g., Carlson, 1989).…”

Section: Methods and Datamentioning

confidence: 99%

See 1 more Smart Citation

Tsunamigenic Splay Faults Imply a Long‐Term Asperity in Southern Prince William Sound, Alaska

Liberty

Haeussler

2019

Geophysical Research Letters

View full text Add to dashboard Cite

Coseismic slip partitioning and uplift over multiple earthquake cycles is critical to understanding upper‐plate fault development. Bathymetric and seismic reflection data from the 1964 Mw9.2 Great Alaska earthquake rupture area reveal sea floor scarps along the tsunamigenic Patton Bay/Cape Cleare/Middleton Island fault system. The faults splay from a megathrust where duplexing and underplating produced rapid exhumation. Trenchward of the duplex region, the faults produce a complex deformation pattern from oblique, south‐directed shortening at the Yakutat‐Pacific plate boundary. Spatial and temporal fault patterns suggest that Holocene megathrust earthquakes had similar relative motions and thus similar tsunami sources as in 1964. Tsunamis during future earthquakes will likely produce similar run‐up patterns and travel times. Splay fault surface expressions thus relate to plate boundary conditions, indicating millennial‐scale persistence of this asperity. We suggest structure of the subducted slab directly influences splay fault and tsunami generation landward of the frontal subduction zone prism.

show abstract

Section: Methods and Datamentioning

confidence: 93%

Section: Methods and Datamentioning

confidence: 99%

Tsunamigenic Splay Faults Imply a Long‐Term Asperity in Southern Prince William Sound, Alaska

Liberty

Haeussler

2019

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…Multiple studies have attempted to reveal past earthquake events in these seismically active regions by studying a variety of natural archives such as lakes, fjords, coastal marshes, and continental margins. Common examples are studies of turbidites and/or mass‐transport deposits (MTDs) present in both lacustrine (e.g., Moernaut et al, 2018; Praet et al, 2017) and offshore environments (e.g., Goldfinger et al, 2003; Kuehl et al, 2017) and the search for tsunami deposits (e.g., Kempf et al, 2017; Komatsubara & Fujiwara, 2007) or biological and sedimentological indicators for coseismic elevation changes (e.g., Garrett et al, 2015; Philibosian et al, 2017) in coastal areas.…”

Section: Introductionmentioning

confidence: 99%

Seismo‐Turbidites in Aysén Fjord (Southern Chile) Reveal a Complex Pattern of Rupture Modes Along the 1960 Megathrust Earthquake Segment

et al. 2020

View full text Add to dashboard Cite

Grainsize analysis and end-member modeling of a long sediment core from Aysén Fjord (southern Chile) allows to identify over 25 seismo-turbidites in the last 9,000 years. Considering the shaking intensities required to trigger these turbidites (V½-VI½), the majority can be related to megathrust earthquakes. Multiple studies in south-central Chile have aimed at finding traces of giant, tsunamigenic megathrust earthquakes leading to the current 5,500-year-long paleoseismological record of the Valdivia segment. However, none of these cover the southern third of the segment. Aysén Fjord allows to fill this data gap and presents the first, crucial paleoseismic data to demonstrate that the 1960 event was not unique for the Valdivia segment, yielding a recurrence rate of 321 ± 116 years in the last two millennia. Moreover, the oldest identified events in Aysén Fjord date back to 9,000 cal years BP and, thus, also extend the regional paleoseismological record in time. We infer a large temporal variability in rupture modes, with successions of full-segment ruptures alternating with partial and cascading ruptures. The latter seems to significantly postpone the occurrence of another full rupture when consecutively occurring in different parts of the segment. Additionally, one outstanding period of seismic quiescence-during which no megathrust earthquake evidence has been found at any paleoseismic site-occurred after a full rupture in AD~745 that presents an unusual uplift/subsidence pattern. Such variability makes it highly speculative to anticipate the rupture mode of the next megathrust earthquake along the Valdivia segment.

show abstract

Seasonal variability of 7Be in suspended sediments from the Copper River, Alaska: implications for quantifying recent flood deposits in coastal environments

Williams¹,

Kuehl²,

Clyne

et al. 2018

Geo-Mar Lett

View full text Add to dashboard Cite

Recent paleoseismicity record in Prince William Sound, Alaska, USA

Cited by 5 publications

References 31 publications

Tsunamigenic Splay Faults Imply a Long‐Term Asperity in Southern Prince William Sound, Alaska

Tsunamigenic Splay Faults Imply a Long‐Term Asperity in Southern Prince William Sound, Alaska

Seismo‐Turbidites in Aysén Fjord (Southern Chile) Reveal a Complex Pattern of Rupture Modes Along the 1960 Megathrust Earthquake Segment

Seasonal variability of 7Be in suspended sediments from the Copper River, Alaska: implications for quantifying recent flood deposits in coastal environments

Contact Info

Product

Resources

About