Submarine Mass Movements in the Upper Saguenay Fjord, (Québec, Canada), Triggered by the 1663 Earthquake

Locat, Jacques; Martin, Francis; Levesque, Christiane; Locat, Pascal; Leroueil, Serge; Konrad, Jean‐Marie; Úrgeles, Roger; Canals, Miquel; Duchesne, Mathieu J.

doi:10.1007/978-94-010-0093-2_56

Cited by 16 publications

(7 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Locat et al . () and Cauchon‐Voyer et al . () identified the effects of repeated earthquake activity in Saguenay Fjord within a graben‐like structure offset from the St. Lawrence Rift in a structural setting very similar to the Timiskaming Graben (Tremblay et al ., ; Fig.…”

Section: Discussionmentioning

confidence: 91%

High‐resolution seismic reflection profiling of neotectonic faults in Lake Timiskaming, Timiskaming Graben, Ontario‐Quebec, Canada

Doughty

Eyles

2013

Sedimentology

View full text Add to dashboard Cite

The Timiskaming Graben is a 400 km long, 50 km wide north-west trending morphotectonic depression within the Canadian Shield of eastern North America and experiences frequent intraplate earthquakes. The graben extends along the border of Ontario and Quebec, connecting southward with the Nipissing and Ottawa-Bonnechere grabens and the St. Lawrence Rift System which includes a similar structure underlying the Hudson Valley of the eastern USA. Together they form a complex failed rift system related to regional extension of North American crust during the breakup of Rodinia and, later, Pangea. The Timiskaming Graben lies within a belt of heightened seismic activity (Western Quebec Seismic Zone) with frequent moderate magnitude (greater than magnitude 5) earthquakes including a magnitude 6.2 in 1935. These events threaten aging urban infrastructure built on soft glacial sediments; post-glacial landslides along the Ottawa Valley suggest earthquakes as large as magnitude 7. The inner part of the Timiskaming Graben is filled by Lake Timiskaming, a large 110 km long post-glacial successor to glacial Lake Barlow that was ponded by the Laurentide Ice Sheet 9500 years ago. The effects of frequent ground shaking on lake floor sediments was assessed by collecting more than 1000 line kilometres of high-resolution 'chirp' seismic profiles. Late glacial Lake Barlow glaciolacustrine and overlying post-glacial sediments are extensively deformed by extensional faults that define prominent horsts and grabens; multibeam bathymetry data suggest that faults influence the morphology of the modern lake floor, despite high sedimentation rates, and indicate recent neotectonic deformation. The Lake Timiskaming area provides evidence of post-glacial intracratonic faulting related to recurring earthquake activity along a weak spot within the North American plate.

show abstract

Section: Discussionmentioning

confidence: 91%

High‐resolution seismic reflection profiling of neotectonic faults in Lake Timiskaming, Timiskaming Graben, Ontario‐Quebec, Canada

Doughty

Eyles

2013

Sedimentology

View full text Add to dashboard Cite

show abstract

“…Embankment increased the loading on shallower as well as deeper sediments leading to the failure with (decreasing soil resistance) or without (increasing loading) excess pore pressure development. It is noteworthy that anthropogenic activities along fjords have also resulted in slope failures (Locat et al, 2003b;Longva et al, 2003) and therefore endangering the local population.…”

Section: Anthropogenic Activitiesmentioning

confidence: 99%

Submarine mass movements on glaciated and non-glaciated European continental margins: A review of triggering mechanisms and preconditions to failure

Leynaud

Mienert

Vanneste³

2009

Marine and Petroleum Geology

View full text Add to dashboard Cite

“…Landslides in fjords (Jorstad 1968) and on the flanks of oceanic islands pose particular hazards to humans. In fjord environments, landslides are frequently associated with 'quick clay', a particularly unstable sediment created when marine clays are uplifted above sea level (usually by glacial rebound) and leached by fresh water (Locat et al 2003). Failure of submarine deltas formed where rivers discharge sediment onto the steep submarine walls of fjords is also common Kulikov et al 1996).…”

Section: Occurrence Distribution and Scale Of Submarine Landslidesmentioning

confidence: 99%

Submarine landslides: processes, triggers and hazard prediction

Masson

Harbitz

Wynn

et al. 2006

Phil. Trans. R. Soc. A.

671

478

View full text Add to dashboard Cite

Huge landslides, mobilizing hundreds to thousands of km(3) of sediment and rock are ubiquitous in submarine settings ranging from the steepest volcanic island slopes to the gentlest muddy slopes of submarine deltas. Here, we summarize current knowledge of such landslides and the problems of assessing their hazard potential. The major hazards related to submarine landslides include destruction of seabed infrastructure, collapse of coastal areas into the sea and landslide-generated tsunamis. Most submarine slopes are inherently stable. Elevated pore pressures (leading to decreased frictional resistance to sliding) and specific weak layers within stratified sequences appear to be the key factors influencing landslide occurrence. Elevated pore pressures can result from normal depositional processes or from transient processes such as earthquake shaking; historical evidence suggests that the majority of large submarine landslides are triggered by earthquakes. Because of their tsunamigenic potential, ocean-island flank collapses and rockslides in fjords have been identified as the most dangerous of all landslide related hazards. Published models of ocean-island landslides mainly examine 'worst-case scenarios' that have a low probability of occurrence. Areas prone to submarine landsliding are relatively easy to identify, but we are still some way from being able to forecast individual events with precision. Monitoring of critical areas where landslides might be imminent and modelling landslide consequences so that appropriate mitigation strategies can be developed would appear to be areas where advances on current practice are possible.

show abstract

Submarine Mass Movements in the Upper Saguenay Fjord, (Québec, Canada), Triggered by the 1663 Earthquake

Cited by 16 publications

References 19 publications

High‐resolution seismic reflection profiling of neotectonic faults in Lake Timiskaming, Timiskaming Graben, Ontario‐Quebec, Canada

High‐resolution seismic reflection profiling of neotectonic faults in Lake Timiskaming, Timiskaming Graben, Ontario‐Quebec, Canada

Submarine mass movements on glaciated and non-glaciated European continental margins: A review of triggering mechanisms and preconditions to failure

Submarine landslides: processes, triggers and hazard prediction

Contact Info

Product

Resources

About