Reconstruction of Late-Quaternary sea- and lake-level changes in a tectonically active marginal basin using seismic stratigraphy: The Gulf of Cariaco, NE Venezuela

Daele, Maarten Van; Welden, Aurélien van; Moernaut, Jasper; Beck, Christian; Audemard, Franck; Sanchez, J.; Jouanne, François; Carrillo, Eduardo; Malavé, Gustavo; Lemus, Andrés; Batist, Marc De

doi:10.1016/j.margeo.2010.10.011

Cited by 32 publications

(22 citation statements)

References 52 publications

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“…The last lacustrine-marine transition has been sampled in different sedimentary cores (Collier et al, 2000;Moretti et al, 2004;Lykousis et al, 2007a;Van Welden, 2007;Campos et al, 2013). This geomorphological setting and the consequences on the seismic stratigraphy are similar to the Gulf of Cariaco, NE Venezuela (Van Daele et al, 2011).…”

Section: Previous Chronostratigraphic Model For the Gulf Of Corinthsupporting

confidence: 57%

Active faulting at the western tip of the Gulf of Corinth, Greece, from high-resolution seismic data

et al. 2015

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International audienceThe Gulf of Corinth is one of the fastest-spreading intra-continental rifts on Earth. GPS data indicate that the rift is currently opening in a NNE-SSW direction, with a rate of extension reaching up to 16 mm yr (super - 1) in its westernmost part. Although the rest of the offshore rift has been well studied, the western tip of the rift is still poorly explored. We present an accurate map of submarine faults in this area based on two high-resolution seismic reflection surveys (single-channel sparker). In the eastern part of the studied area, the sedimentary infill is affected by the known North Eratini, South Eratini, and West Channel faults. Further to the west, the seafloor is mostly flat and is bounded to the north by the normal, south-dipping, Trizonia fault. To the north, the shallower part of the Gulf shows to the east a diffuse pattern of normal and strike-slip deformation, which is replaced to the west by a 7.5 km long SE striking strike-slip fault zone, called the Managouli fault zone. To the westernmost tip of the Gulf, in the Nafpaktos Basin, two fault sets with different strikes are encountered; the one with a NE-SW strike exhibits a clear strike-slip component. The western tip of the Gulf of Corinth is the only part of the Corinth Rift where convincing evidence for strike-slip movement has been found. This fault pattern is likely related to the complex deformation occurring at the diffuse junction at the western tip of the Rift between three crustal blocks: Continental Greece, Peloponnese, and the Ionian Island-Akarnania block

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Section: Previous Chronostratigraphic Model For the Gulf Of Corinthsupporting

confidence: 57%

Active faulting at the western tip of the Gulf of Corinth, Greece, from high-resolution seismic data

et al. 2015

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“…The SL-F horizon is offset 5 ms (or 3 ms coseismic offset if we discount the seafloor offset accumulated by the 2007 event), but the earthquake-generated megaturbidite ponds in the northwestern "downthrown" fault block (similar to observations of Marco & Agnon, 1995 in the Dead Sea graben), reducing the offset to 2 ms (or leveling the offset, if we discount the 2007 displacement). The observed fault in the fjord's sedimentary infill is the result of deformation of the sedimentary infill in response to the strike-slip movement of the bedrock (e.g., Brothers et al, 2011;de La Taille et al, 2015;Van Daele et al, 2011), which can include, among others, Riedel shear fractures and extension fractures (Cloos, 1932;Sylvester, 1988). The observed fault in the fjord's sedimentary infill is the result of deformation of the sedimentary infill in response to the strike-slip movement of the bedrock (e.g., Brothers et al, 2011;de La Taille et al, 2015;Van Daele et al, 2011), which can include, among others, Riedel shear fractures and extension fractures (Cloos, 1932;Sylvester, 1988).…”

Section: Linking Mtd Events With Source Faults 531 Liquiñe-ofqui Fmentioning

confidence: 99%

Holocene Event Record of Aysén Fjord (Chilean Patagonia): An Interplay of Volcanic Eruptions and Crustal and Megathrust Earthquakes

et al. 2018

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In the first months of 2007, the Aysén region in southern Chile was affected by a crustal seismic swarm. Its largest earthquake (Mw 6.2) occurred in April and had its epicenter in Aysén Fjord. Seismic intensities became so high that hundreds of onshore mass movements were triggered, several of which entered into the fjord, resulting in mass transport deposits (MTDs) preserved at the fjord bottom. Here we present a Holocene record of paleo‐earthquakes in the previously unstudied Patagonian fjordland based on MTD stratigraphy. High‐resolution seismic data retrieved using two different seismic systems (sparker and TOPAS) reveal multiple older MTDs on different stratigraphic levels. Correlation of the seismic stratigraphy with sedimentological data obtained from a long Calypso core (MD07‐3117) allows conclusion on the seismic origin of these deposits. Additionally, radiocarbon dating permits constructing an age model, validated by tephrochronology, providing an age for the different MTD levels. We thus present a highly detailed paleoseismological history of the Aysén region, including at least six major Holocene earthquakes, one of which is likely related to a known megathrust earthquake. Other earthquakes are related to activity of the Liquiñe‐Ofqui Fault Zone (LOFZ), forming the main source of seismic hazard in the area. We can infer a general average recurrence time for LOFZ earthquakes of ~2,100 years in the vicinity of Aysén Fjord with clustered events during the early and late Holocene. Finally, we argue that cascading events (causal link between volcanic and seismic events) may be a frequent phenomenon along the LOFZ.

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“…Therefore, the sedimentary sequences are not correlated to any geologic time units so far. However, we assume that the age of the more superficial sedimentary units may not differ much from that obtained by Van Daele et al (2011), which continuously record sedimentation to the present.…”

Section: Fig 5)mentioning

confidence: 79%

“…Most of the shallow seismic surveys are of local coverage, low density or poor data quality. In University of Ghent (Belgium), has launched and carried out an ever-growing program of single-channel high-resolution shallow seismic reflection acquisition (e.g., Audemard et al, 2007;Van Daele, 2007;Van Welden, 2007;Audemard et al, 2011;Van Daele et al, 2011), a more modest campaign of core recovery offshore (Aguilar et al, in prep. ) and onshore (Leal & Scremin, 2011;Oropeza et al, 2011;Leal et al, 2014) so far, and a growing paleo-and historical tsunami recognition program along our exposed low-lying inhabited seashores (Audemard, 2012;Audemard et al, 2012;Audemard & Leal, 2013;Leal et al, 2014).…”

Section: Fig 2)mentioning

confidence: 99%

The 1900 Mw 7.6 earthquake offshore north–central Venezuela: Is La Tortuga or San Sebastián the source fault?

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Marine and Petroleum Geology

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Reconstruction of Late-Quaternary sea- and lake-level changes in a tectonically active marginal basin using seismic stratigraphy: The Gulf of Cariaco, NE Venezuela

Cited by 32 publications

References 52 publications

Active faulting at the western tip of the Gulf of Corinth, Greece, from high-resolution seismic data

Active faulting at the western tip of the Gulf of Corinth, Greece, from high-resolution seismic data

Holocene Event Record of Aysén Fjord (Chilean Patagonia): An Interplay of Volcanic Eruptions and Crustal and Megathrust Earthquakes

The 1900 Mw 7.6 earthquake offshore north–central Venezuela: Is La Tortuga or San Sebastián the source fault?

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