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Ian Shennan's Outputs (87)

Scottish landform example: isolation basins of Arisaig (2024)
Journal Article
Best, L., & Shennan, I. (online). Scottish landform example: isolation basins of Arisaig. Scottish Geographical Journal, 1-20. https://doi.org/10.1080/14702541.2024.2401166

An isolation basin is a geomorphological landform that enables the precise reconstruction of the former height and age of relative sea level. A series of isolation basins at different elevations within a small geographical area can provide a high-res... Read More about Scottish landform example: isolation basins of Arisaig.

Stratigraphic evidence of relative sea level changes produced by megathrust earthquakes in the Jalisco subduction zone, Mexico. The signature of the 1995 Colima-Jalisco earthquake (Mw 8) as a modern analogue (2023)
Journal Article
Bustamante Fernandez, E., Woodroffe, S., Lloyd, J. M., & Shennan, I. (2023). Stratigraphic evidence of relative sea level changes produced by megathrust earthquakes in the Jalisco subduction zone, Mexico. The signature of the 1995 Colima-Jalisco earthquake (Mw 8) as a modern analogue. Marine Geology, 463, Article 107100. https://doi.org/10.1016/j.margeo.2023.107100

Geological evidence of megathrust earthquakes along the Mexican Pacific coast relies predominantly on tsunami deposits. Records of coseismic relative sea-level changes are scarce even though such evidence can complement and constrain tsunami records,... Read More about Stratigraphic evidence of relative sea level changes produced by megathrust earthquakes in the Jalisco subduction zone, Mexico. The signature of the 1995 Colima-Jalisco earthquake (Mw 8) as a modern analogue.

On the varied impact of the Storegga tsunami in northwest Scotland (2023)
Journal Article
Woodroffe, S. A., Hill, J., Bustamante‐Fernandez, E., Lloyd, J. M., Luff, J., Richards, S., & Shennan, I. (online). On the varied impact of the Storegga tsunami in northwest Scotland. Journal of Quaternary Science, 38(8), 1219-1232. https://doi.org/10.1002/jqs.3539

In this paper we evaluate new data and those from previous studies in northwest Scotland and perform a modelling study to test the hypothesis that the Storegga tsunami (submarine slope failure off the continental shelf of Central Norway dated to 8120... Read More about On the varied impact of the Storegga tsunami in northwest Scotland.

Investigating the roles of relative sea-level change and glacio-isostatic adjustment on the retreat of a marine based ice stream in NW Scotland (2022)
Journal Article
Simms, A. R., Best, L., Shennan, I., Bradley, S. L., Small, D., Bustamante, E., Lightowler, A., Osleger, D., & Sefton, J. (2022). Investigating the roles of relative sea-level change and glacio-isostatic adjustment on the retreat of a marine based ice stream in NW Scotland. Quaternary Science Reviews, 277, Article 107366. https://doi.org/10.1016/j.quascirev.2021.107366

The record of ice-sheet demise since the last glacial maximum (LGM) provides an opportunity to test the relative importance of instability mechanisms, including relative sea-level (RSL) change, controlling ice-sheet retreat. Here we examine the recor... Read More about Investigating the roles of relative sea-level change and glacio-isostatic adjustment on the retreat of a marine based ice stream in NW Scotland.

Local and Regional Constraints on Relative Sea-Level Changes in Southern Isle of Skye, Scotland, since the Last Glacial Maximum (2021)
Journal Article
Best, L., Simms, A., Brader, M., Lloyd, J., Sefton, J., & Shennan, I. (2022). Local and Regional Constraints on Relative Sea-Level Changes in Southern Isle of Skye, Scotland, since the Last Glacial Maximum. Journal of Quaternary Science, 37(1), 59-70. https://doi.org/10.1002/jqs.3376

New relative sea-level (RSL) data constrain the timing and magnitude of RSL changes in the southern Isle of Skye following the Last Glacial Maximum (LGM). We identify a marine limit at ~23 m OD, indicating RSL ~20 m above present c. 15.1 ka. Isolatio... Read More about Local and Regional Constraints on Relative Sea-Level Changes in Southern Isle of Skye, Scotland, since the Last Glacial Maximum.

Sensitivity of tidal marshes as recorders of major megathrust earthquakes: constraints from the 25 December 2016 Mw 7.6 Chiloé earthquake, Chile (2021)
Journal Article
Brader, M., Garrett, E., Melnick, D., & Shennan, I. (2021). Sensitivity of tidal marshes as recorders of major megathrust earthquakes: constraints from the 25 December 2016 Mw 7.6 Chiloé earthquake, Chile. Journal of Quaternary Science, 36(6), 991-1002. https://doi.org/10.1002/jqs.3323

We present evidence of land-level change resulting from the 2016 Mw 7.6 Chiloé earthquake from tidal wetlands along the southern coastline of Isla de Chiloé, Chile, to test criteria for the detection of low-level, <0.1 m, coseismic land-level change....

A reconciled solution of Meltwater Pulse 1A sources using sea-level fingerprinting (2021)
Journal Article
Lin, Y., Hibbert, F., Whitehouse, P., Woodroffe, S., Purcell, A., Shennan, I., & Bradley, S. (2021). A reconciled solution of Meltwater Pulse 1A sources using sea-level fingerprinting. Nature Communications, 12, Article 2015. https://doi.org/10.1038/s41467-021-21990-y

The most rapid global sea-level rise event of the last deglaciation, Meltwater Pulse 1A (MWP-1A), occurred ∼14,650 years ago. Considerable uncertainty regarding the sources of meltwater limits understanding of the relationship between MWP-1A and the... Read More about A reconciled solution of Meltwater Pulse 1A sources using sea-level fingerprinting.

Inception of a global atlas of sea levels since the Last Glacial Maximum (2019)
Journal Article
Khan, N. S., Horton, B. P., Engelhart, S., Rovere, A., Vacchi, M., Ashe, E. L., Törnqvist, T. E., Dutton, A., Hijma, M. P., & Shennan, I. (2019). Inception of a global atlas of sea levels since the Last Glacial Maximum. Quaternary Science Reviews, 220, 359-371. https://doi.org/10.1016/j.quascirev.2019.07.016

Determining the rates, mechanisms, and geographic variability of relative sea-level (RSL) change following the Last Glacial Maximum (LGM) provides insight into the sensitivity of ice sheets to climate change, the response of the solid Earth and gravi... Read More about Inception of a global atlas of sea levels since the Last Glacial Maximum.

Late Holocene paleoseismology of Shuyak Island, Alaska (2018)
Journal Article
Shennan, I., Brader, M. D., Barlow, N. L., Davies, F. P., Longley, C., & Tunstall, N. (2018). Late Holocene paleoseismology of Shuyak Island, Alaska. Quaternary Science Reviews, 201, 380-395. https://doi.org/10.1016/j.quascirev.2018.10.028

We report stratigraphic evidence of land-level changes along the eastern portion of the Alaska-Aleutian megathrust. Four marshes on Shuyak Island record variable amounts of coseismic deformation during four pre-20th century earthquakes. We combine th... Read More about Late Holocene paleoseismology of Shuyak Island, Alaska.

Predicting marsh vulnerability to sea-level rise using Holocene relative sea-level data (2018)
Journal Article
Horton, B., Shennan, I., Bradley, S., Cahill, N., Kirwan, M., Kopp, R., & Shaw, T. (2018). Predicting marsh vulnerability to sea-level rise using Holocene relative sea-level data. Nature Communications, 9, Article 2687. https://doi.org/10.1038/s41467-018-05080-0

Tidal marshes rank among Earth’s vulnerable ecosystems, which will retreat if future rates of relative sea-level rise (RSLR) exceed marshes’ ability to accrete vertically. Here, we assess the limits to marsh vulnerability by analyzing >780 Holocene r... Read More about Predicting marsh vulnerability to sea-level rise using Holocene relative sea-level data.

Sea level studies: Overview (2018)
Book Chapter
Shennan, I. (2018). Sea level studies: Overview. In Reference module in Earth systems and environmental sciences. Elsevier. https://doi.org/10.1016/b978-0-12-409548-9.11063-2

Understanding relative sea-level changes helps explain critical interactions in Earth environmental systems throughout the Quaternary. Relative sea-level changes record transfers of mass between oceans and continents during expansion and contraction... Read More about Sea level studies: Overview.

Relative sea‐level changes and crustal movements in Britain and Ireland since the Last Glacial Maximum (2018)
Journal Article
Shennan, I., Bradley, S., & Edwards, R. (2018). Relative sea‐level changes and crustal movements in Britain and Ireland since the Last Glacial Maximum. Quaternary Science Reviews, 188, 143-159. https://doi.org/10.1016/j.quascirev.2018.03.031

The new sea-level database for Britain and Ireland contains >2100 data points from 86 regions and records relative sea-level (RSL) changes over the last 20 ka and across elevations ranging from ∼+40 to −55 m. It reveals radically different patterns o... Read More about Relative sea‐level changes and crustal movements in Britain and Ireland since the Last Glacial Maximum.

Detection limits of tidal-wetland sequences to identify variable rupture modes of megathrust earthquakes (2016)
Journal Article
Shennan, I., Garrett, E., & Barlow, N. (2016). Detection limits of tidal-wetland sequences to identify variable rupture modes of megathrust earthquakes. Quaternary Science Reviews, 150, 1-30. https://doi.org/10.1016/j.quascirev.2016.08.003

Recent paleoseismological studies question whether segment boundaries identified for 20th and 21st century great, >M8, earthquakes persist through multiple earthquake cycles or whether smaller segments with different boundaries rupture and cause sign... Read More about Detection limits of tidal-wetland sequences to identify variable rupture modes of megathrust earthquakes.

Sea-level constraints on the amplitude and source distribution of Meltwater Pulse 1A (2015)
Journal Article
Liu, J., Milne, G., Kopp, R., Clark, P., & Shennan, I. (2016). Sea-level constraints on the amplitude and source distribution of Meltwater Pulse 1A. Nature Geoscience, 9(2), 130-134. https://doi.org/10.1038/ngeo2616

During the last deglaciation, sea levels rose as ice sheets retreated. This climate transition was punctuated by periods of more intense melting; the largest and most rapid of these—Meltwater Pulse 1A—occurred about 14,500 years ago, with rates of se... Read More about Sea-level constraints on the amplitude and source distribution of Meltwater Pulse 1A.

Constraints on regional drivers of relative sea-level change around Cordova, Alaska (2015)
Journal Article
Garrett, E., Barlow, N., Cool, H., Kaufman, D., Shennan, I., & Zander, P. (2015). Constraints on regional drivers of relative sea-level change around Cordova, Alaska. Quaternary Science Reviews, 113, 48-59. https://doi.org/10.1016/j.quascirev.2014.12.002

New records of paleoenvironmental change from two lakes near Cordova, south central Alaska, combined with analysis of previously reported sediment sequences from the adjacent Copper River Delta, provide quantitative constraints on a range of Earth sy... Read More about Constraints on regional drivers of relative sea-level change around Cordova, Alaska.

Handbook of sea-level research: framing research questions. (2015)
Book Chapter
Shennan, I. (2015). Handbook of sea-level research: framing research questions. In I. Shennan, A. Long, & B. Horton (Eds.), Handbook of Sea-Level Research (3-25). John Wiley and Sons. https://doi.org/10.1002/9781118452547.ch2

Many studies of sea‐level change are implicitly inductive, depending on inferences and reasoning, where extrapolations may be made to develop generalizations. An inductive approach typically follows a line of reasoning from experience, the argument f... Read More about Handbook of sea-level research: framing research questions..

Holocene sea-level history and coastal evolution of the north-western Fenland, eastern England (2015)
Journal Article
Brew, D. S., Horton, B. P., Evans, G., Innes, J. B., & Shennan, I. (2015). Holocene sea-level history and coastal evolution of the north-western Fenland, eastern England. Proceedings of the Geologists' Association, 126(1), 72-85. https://doi.org/10.1016/j.pgeola.2014.12.001

Holocene relative sea-level reconstructions reveal spatial and temporal patterns, indicating the importance of regional- to local-scale processes for understanding coastal evolution. We reconstruct the Holocene sea-level history and coastal evolution... Read More about Holocene sea-level history and coastal evolution of the north-western Fenland, eastern England.

Reconstructing paleoseismic deformation, 2: 1000 years of great earthquakes at Chucalén, south central Chile (2014)
Journal Article
Garrett, E., Shennan, I., Woodroffe, S., Cisternas, M., Hocking, E., & Gulliver, P. (2015). Reconstructing paleoseismic deformation, 2: 1000 years of great earthquakes at Chucalén, south central Chile. Quaternary Science Reviews, 113, 112-122. https://doi.org/10.1016/j.quascirev.2014.10.010

In this paper we adopt a quantitative biostratigraphic approach to establish a 1000-year-long coastal record of megathrust earthquake and tsunami occurrence in south central Chile. Our investigations focus on a site in the centre of the rupture segme... Read More about Reconstructing paleoseismic deformation, 2: 1000 years of great earthquakes at Chucalén, south central Chile.

Great tsunamigenic earthquakes during the last 1000 years on the Alaska megathrust (2014)
Journal Article
Shennan, I., Barlow, N., Carver, G., Davies, F., Garrett, E., & Hocking, E. (2014). Great tsunamigenic earthquakes during the last 1000 years on the Alaska megathrust. Geology, 42(8), 687-690. https://doi.org/10.1130/g35797.1

Large to great earthquakes and related tsunamis generated on the Alaska megathrust produce major hazards for both the area of rupture and heavily populated coastlines around much of the Pacific Ocean. Recent modeling studies suggest that single-segme... Read More about Great tsunamigenic earthquakes during the last 1000 years on the Alaska megathrust.