Tsunamigenic slope failures: the Pacific Islands ‘blind spot’?

Goff, James; Terry, James P.

doi:10.1007/s10346-015-0649-3

Cited by 24 publications

(9 citation statements)

References 58 publications

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“…First, what is the offshore morphology of a continuously active and rapidly uplifting volcanic island, and what processes caused that morphology? We investigate whether arcuate-bight like features can be linked to slope failure, as suggested previously by Goff and Terry (2016), and whether offshore sediment transport pathways can be identified, such as the trains of crescentic bedforms observed on other volcanic islands. Second, we ask whether submarine landslides and crescentic bedforms found offshore from volcanic islands are always directly linked to major eruptive volcanic activity or flank collapses?…”

Section: Aimsmentioning

confidence: 86%

“…Despite their vulnerability, remarkably few detailed offshore surveys exist for Small Island Developing States in the South Pacific; largely due to geographic and economic constraints (CClare et al, 2018). Therefore, the South Pacific has been identified as a "hazard blind-spot" with respect to submarine landslides and associated tsunamis (Terry and Goff, 2012;Goff and Terry, 2016). Furthermore, the link between onshore and offshore sediment transport processes, and hence, identification of the triggers for offshore hazards, is often unclear as integrated subaerial and submarine surveys are limited to relatively few volcanic islands worldwide (e.g., Casalbore et al, 2010;Babonneau et al, 2013).…”

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confidence: 99%

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Complex and Cascading Triggering of Submarine Landslides and Turbidity Currents at Volcanic Islands Revealed From Integration of High-Resolution Onshore and Offshore Surveys

et al. 2018

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Section: Aimsmentioning

confidence: 86%

mentioning

confidence: 99%

Complex and Cascading Triggering of Submarine Landslides and Turbidity Currents at Volcanic Islands Revealed From Integration of High-Resolution Onshore and Offshore Surveys

et al. 2018

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“…Therefore, these and future observations using similar hydrophone networks can play an important role in improving our understanding of a globally significant hazard (e.g. Tappin et al, 2008;Harbitz et al, 2014;Goff and Terry, 2016). Again, calibration of the hydrophone signals is needed; hence, field studies that make multi-parameter measurements of submarine landslide activity will contribute significantly to the fingerprinting of different acoustic responses, and will enhance confidence in the future acoustic detection and characterization of submarine landslides.…”

Section: Quantifying Landslide Kinematics Using Hydrophonesmentioning

confidence: 99%

“…Arcshaped convergent continental margins are also good future candidates for this approach, as are enclosed basins such as the Mediterranean, as they provide similarly well-suited geometries, and are often themselves 'blind spots' for landslide-tsunami hazard where new insights are required (e.g. Sunda Arc; Goff and Terry, 2016). The geometry of many margins will not suit this approach, however.…”

Section: Can Passive Seismic and Acoustic Techniques Overcome The Logistical Challenges That Have Previously-hindered Monitoring Of Submamentioning

confidence: 99%

Seismic and Acoustic Monitoring of Submarine Landslides: Ongoing Challenges, Recent Successes and Future Opportunities

Clare¹,

Lintern²,

Pope³

et al. 2021

Preprint

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Submarine landslides pose a hazard to coastal communities due to the tsunamis they can generate, and can damage critical seafloor infrastructure, such as the network of cables that underpin global data transfer and communications. These mass movements can be orders of magnitude larger than their onshore equivalents and are found on all of the world’s continental margins; from coastal zones to hadal trenches. Despite their prevalence, and importance to society, offshore monitoring studies have been limited by the largely unpredictable occurrence of submarine landslide and the need to cover large regions of extensive continental margins. Recent subsea monitoring has provided new insights into the preconditioning and run-out of submarine landslides using active geophysical techniques, but these tools only measure a very small spatial footprint, and are power and memory intensive, thus limiting long duration monitoring campaigns. Most landslide events therefore remain entirely unrecorded. Here we first show how passive acoustic and seismologic techniques can record acoustic emissions and ground motions created by terrestrial landslides. We then show how this terrestrial-focused research has catalysed advances in the detection and characterisation of submarine landslides, using both onshore and offshore networks of broadband seismometers, hydrophones and geophones. We then discuss some of the new insights into submarine landslide preconditioning, timing, location, velocity and their down-slope evolution that is arising from these advances. We finally outline some of the outstanding challenges, in particular emphasising the need for calibration of seismic and acoustic signals generated by submarine landslides and their run-out. Once confidence can be enhanced in submarine landslide signal detection and interpretation, passive seismic and acoustic sensing has strong potential to enable more complete hazard catalogues to be built, and opens the door to emerging techniques (such as fibre-optic sensing), to fill key, but outstanding, knowledge gaps concerning these important underwater phenomena.

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“…Tsunamis generated by subaqueous landslides threaten many coastal communities and have caused large numbers of fatalities (Tappin et al 2001;Ward 2001;Harbitz et al 2014). Low-lying Small Island Developing States, such as those in the South Pacific, are particularly at risk from locally-sourced tsunamis, but little is currently known about the scale, location and recurrence of tsunamigenic landslides in those areas (Goff & Terry 2016). Under burial, subaqueous landslide deposits are recognized as an important element of hydrocarbon systems: conditioning reservoir distribution (Armitage et al 2009;Kneller et al 2016), acting as seals (Cardona et al 2016) and as potential reservoirs (Meckel 2011;Henry et al 2017).…”

mentioning

confidence: 99%

A consistent global approach for the morphometric characterization of subaqueous landslides

Clare

Chaytor

Dabson³

et al. 2018

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Landslides are common in aquatic settings worldwide, from lakes and coastal environments to the deep sea. Fast-moving, large-volume landslides can potentially trigger destructive tsunamis. Landslides damage and disrupt global communication links and other critical marine infrastructure. Landslide deposits act as foci for localized, but important, deep-seafloor biological communities. Under burial, landslide deposits play an important role in a successful petroleum system. While the broad importance of understanding subaqueous landslide processes is evident, a number of important scientific questions have yet to receive the needed attention. Collecting quantitative data is a critical step to addressing questions surrounding subaqueous landslides. Quantitative metrics of subaqueous landslides are routinely recorded, but which ones, and how they are defined, depends on the end-user focus. Differences in focus can inhibit communication of knowledge between communities, and complicate comparative analysis. This study outlines an approach specifically for consistent measurement of subaqueous landslide morphometrics to be used in the design of a broader, global open-source, peer-curated database. Examples from different settings illustrate how the approach can be applied, as well as the difficulties encountered when analysing different landslides and data types. Standardizing data collection for subaqueous landslides should result in more accurate geohazard predictions and resource estimation.

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Tsunamigenic slope failures: the Pacific Islands ‘blind spot’?

Cited by 24 publications

References 58 publications

Complex and Cascading Triggering of Submarine Landslides and Turbidity Currents at Volcanic Islands Revealed From Integration of High-Resolution Onshore and Offshore Surveys

Complex and Cascading Triggering of Submarine Landslides and Turbidity Currents at Volcanic Islands Revealed From Integration of High-Resolution Onshore and Offshore Surveys

Seismic and Acoustic Monitoring of Submarine Landslides: Ongoing Challenges, Recent Successes and Future Opportunities

A consistent global approach for the morphometric characterization of subaqueous landslides

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