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Vp/Vs structure and Pn anisotropy across the Louisville Ridge, seaward of the Tonga-Kermadec Trench (2024)
Journal Article
Contreras-Reyes, E., Grevemeyer, I., Peirce, C., & Obando-Orrego, S. (2024). Vp/Vs structure and Pn anisotropy across the Louisville Ridge, seaward of the Tonga-Kermadec Trench. Tectonophysics, 885, Article 230417. https://doi.org/10.1016/j.tecto.2024.230417

The Pacific Plate within the collision zone between the Louisville Ridge and the Tonga-Kermadec Trench was formed at the Osbourn Trough, a paleo spreading center that became inactive during the Cretaceous. In this region, the trench shallows from a d... Read More about Vp/Vs structure and Pn anisotropy across the Louisville Ridge, seaward of the Tonga-Kermadec Trench.

Application of a seismic network to baleen whale call detection and localization in the Panama basin-a Bryde's whale example. (2024)
Journal Article
Tary, J. B., Peirce, C., Hobbs, R., Bonilla Walker, F., De La Hoz, C., Bird, A., & Vargas, C. A. (2024). Application of a seismic network to baleen whale call detection and localization in the Panama basin-a Bryde's whale example. The Journal of the Acoustical Society of America, 155(3), 2075-2086. https://doi.org/10.1121/10.0025290

Baleen whales use sounds of various characteristics for different tasks and interactions. This study focuses on recordings from the Costa Rica Rift, in the Eastern Tropical Pacific Ocean, made by 25 ocean-bottom seismographs and a vertical array of 1... Read More about Application of a seismic network to baleen whale call detection and localization in the Panama basin-a Bryde's whale example..

Oceanic crust – seismic structure, lithology and the cause of the 2A Event at borehole 504B (2024)
Journal Article
Peirce, C., & Hobbs, R. (2024). Oceanic crust – seismic structure, lithology and the cause of the 2A Event at borehole 504B. Geophysical Journal International, 237(1), 159-189. https://doi.org/10.1093/gji/ggae029

This study focuses on the 3-D velocity structure and thickness of ~7 Myr-old oceanic crust surrounding borehole 504B, located ~235 km from the intermediate-spreading Costa Rica Rift (Panama Basin). It investigates how well seismic structure determine... Read More about Oceanic crust – seismic structure, lithology and the cause of the 2A Event at borehole 504B.

Structure and dynamics of the Ecuador Fracture Zone, Panama Basin (2023)
Journal Article
Peirce, C., Tedd, J., & Hobbs, R. (2023). Structure and dynamics of the Ecuador Fracture Zone, Panama Basin. Geophysical Journal International, 235(2), 1519-1540. https://doi.org/10.1093/gji/ggad315

In this study, multiple geophysical data types are used to investigate the structure and dynamics of the Ecuador Fracture Zone – a complex multi-stranded strike-slip fault system located in the Panama Basin. Gravity modelling reveals a 25-30 km-wide... Read More about Structure and dynamics of the Ecuador Fracture Zone, Panama Basin.

Three-dimensional S-wave velocity structure of oceanic core complexes at 13N on the Mid-Atlantic Ridge (2022)
Journal Article
Peirce, C., Funnell, M., Reston, T., & MacLeod, C. (2022). Three-dimensional S-wave velocity structure of oceanic core complexes at 13N on the Mid-Atlantic Ridge. Geophysical Journal International, 232(1), 615-642. https://doi.org/10.1093/gji/ggac350

13°N on the Mid-Atlantic Ridge is regarded as a type site for oceanic core complexes (OCCs). Within ~70 km along the spreading centre, it hosts four OCCs in different stages of their life cycle making this an ideal location to determine how OCCs are... Read More about Three-dimensional S-wave velocity structure of oceanic core complexes at 13N on the Mid-Atlantic Ridge.

Carbon and sediment fluxes inhibited in the submarine Congo Canyon by landslide-damming (2022)
Journal Article
Pope, E. L., Heijnen, M. S., Talling, P. J., Jacinto, R. S., Gaillot, A., Baker, M. L., …Urlaub, M. (2022). Carbon and sediment fluxes inhibited in the submarine Congo Canyon by landslide-damming. Nature Geoscience, 15(10), 845-853. https://doi.org/10.1038/s41561-022-01017-x

Landslide-dams, which are often transient, can strongly affect the geomorphology, and sediment and geochemical fluxes, within subaerial fluvial systems. The potential occurrence and impact of analogous landslide-dams in submarine canyons has, however... Read More about Carbon and sediment fluxes inhibited in the submarine Congo Canyon by landslide-damming.

Longest sediment flows yet measured show how major rivers connect efficiently to deep sea (2022)
Journal Article
Talling, P. J., Baker, M. L., Pope, E. L., Ruffell, S. C., Jacinto, R. S., Heijnen, M. S., …Hilton, R. J. (2022). Longest sediment flows yet measured show how major rivers connect efficiently to deep sea. Nature Communications, 13(1), https://doi.org/10.1038/s41467-022-31689-3

Here we show how major rivers can efficiently connect to the deep-sea, by analysing the longest runout sediment flows (of any type) yet measured in action on Earth. These seafloor turbidity currents originated from the Congo River-mouth, with one flo... Read More about Longest sediment flows yet measured show how major rivers connect efficiently to deep sea.

Active ocean-continent transform margins: seismic investigation of the Cayman Trough-Swan Island ridge-transform intersection (2022)
Journal Article
Peirce, C., Grevemeyer, I., Hayman, N., & Van Avendonk, H. (2022). Active ocean-continent transform margins: seismic investigation of the Cayman Trough-Swan Island ridge-transform intersection. Geophysical Journal International, 229(3), 1604-1627. https://doi.org/10.1093/gji/ggac019

The southern boundary of the Cayman Trough in theCaribbean is marked by the Swan Islands transform fault (SITF), which also represents the ocean-continent transition of the Honduras continental margin. This is one of the few places globally where a t... Read More about Active ocean-continent transform margins: seismic investigation of the Cayman Trough-Swan Island ridge-transform intersection.

Local rift and intraplate seismicity reveal shallow crustal fluid-related activity and sub-crustal faulting (2021)
Journal Article
Tary, J., Hobbs, R., Peirce, C., Lesmes Lesmes, C., & Funnell, M. (2021). Local rift and intraplate seismicity reveal shallow crustal fluid-related activity and sub-crustal faulting. Earth and Planetary Science Letters, 562, Article 116857. https://doi.org/10.1016/j.epsl.2021.116857

Seismicity delineating the mid-ocean ridge system in the Panama Basin is mostly concentrated along transform offsets. Most intraplate areas show little-to-no seismic activity. Here we analyze passive recordings from a short-term deployment of 75 ocea... Read More about Local rift and intraplate seismicity reveal shallow crustal fluid-related activity and sub-crustal faulting.

Evolution and properties of young oceanic crust: constraints from Poisson's ratio (2021)
Journal Article
Funnell, M., Robinson, A., Hobbs, R., & Peirce, C. (2021). Evolution and properties of young oceanic crust: constraints from Poisson's ratio. Geophysical Journal International, 225(3), 1874-1896. https://doi.org/10.1093/gji/ggab062

The seismic velocity of the oceanic crust is a function of its physical properties that include its lithology, degree of alteration, and porosity. Variations in these properties are particularly significant in young crust, but also occur with age as... Read More about Evolution and properties of young oceanic crust: constraints from Poisson's ratio.

Seismicity trends and detachment fault structure at 13N, Mid-Atlantic Ridge (2020)
Journal Article
Parnell-Turner, R., Sohn, R., Peirce, C., Reston, R., MacLeod, C., Searle, R., & Simao, N. (2021). Seismicity trends and detachment fault structure at 13N, Mid-Atlantic Ridge. Geology, 49(3), 320-324. https://doi.org/10.1130/g48420.1

At slow-spreading ridges, plate separation is commonly partly accommodated by slip on long-lived detachment faults, exposing upper mantle and lower crustal rocks on the seafloor. However, the mechanics of this process, the subsurface structure, and t... Read More about Seismicity trends and detachment fault structure at 13N, Mid-Atlantic Ridge.

Magmatic and tectonic segmentation of the intermediate-spreading Costa Rica Rift - a fine balance between magma supply rate, faulting, and hydrothermal circulation (2020)
Journal Article
Robinson, A., Zhang, L., Hobbs, R., Peirce, C., & Tong, V. (2020). Magmatic and tectonic segmentation of the intermediate-spreading Costa Rica Rift - a fine balance between magma supply rate, faulting, and hydrothermal circulation. Geophysical Journal International, 222(1), 132-152. https://doi.org/10.1093/gji/ggaa152

3-D tomographic modelling of wide-angle seismic data, recorded at the intermediate-spreading Costa Rica Rift, has revealed a P-wave seismic velocity anomaly low located beneath a small overlapping spreading centre that forms a non-transform discontin... Read More about Magmatic and tectonic segmentation of the intermediate-spreading Costa Rica Rift - a fine balance between magma supply rate, faulting, and hydrothermal circulation.

3-D P-wave velocity structure of oceanic core complexes at 13◦N on the Mid-Atlantic Ridge (2020)
Journal Article
Simão, N., Peirce, C., Funnell, M., Robinson, A., Searle, R., MacLeod, C., & Reston, T. (2020). 3-D P-wave velocity structure of oceanic core complexes at 13◦N on the Mid-Atlantic Ridge. Geophysical Journal International, 221(3), 1555-1579. https://doi.org/10.1093/gji/ggaa093

The Mid-Atlantic Ridge at 13° N is regarded as a type locality for oceanic core complexes (OCCs), as it contains, within ∼70 km along the spreading axis, four that are at different stages of their life cycle. The wealth of existing seabed observation... Read More about 3-D P-wave velocity structure of oceanic core complexes at 13◦N on the Mid-Atlantic Ridge.

Magmatism versus serpentinization – crustal structure along the 13°N segment at the Mid-Atlantic Ridge (2020)
Journal Article
Peirce, C., Robinson, A., Funnell, M., Searle, R., MacLeod, C., & Reston, T. (2020). Magmatism versus serpentinization – crustal structure along the 13°N segment at the Mid-Atlantic Ridge. Geophysical Journal International, 221(2), 981-1001. https://doi.org/10.1093/gji/ggaa052

A region of oceanic core complexes (OCCs) exists at 13°N on the Mid-Atlantic Ridge that is regarded as a type site. This site includes two OCCs at 13°20′N and 13°30′N, thought to be in the active and dying stages of evolution, and two together called... Read More about Magmatism versus serpentinization – crustal structure along the 13°N segment at the Mid-Atlantic Ridge.

Magma-hydrothermal interactions at the Costa Rica Rift from data collected in 1994 and 2015 (2019)
Journal Article
Lowell, R., Zhang, L., Maqueda, M., Banyte, D., Tong, V., Johnston, R., …Robinson, A. (2020). Magma-hydrothermal interactions at the Costa Rica Rift from data collected in 1994 and 2015. Earth and Planetary Science Letters, 531, Article 115991. https://doi.org/10.1016/j.epsl.2019.115991

We use co-located CTD/transmissometry casts and multichannel seismic reflection surveys conducted at the Costa Rica Rift (CRR) to provide a better understanding of magma-hydrothermal processes occurring at an intermediate-rate spreading center. Water... Read More about Magma-hydrothermal interactions at the Costa Rica Rift from data collected in 1994 and 2015.

Constraining the maximum depth of brittle deformation at slow- and ultraslow-spreading ridges using microseismicity (2019)
Journal Article
Grevemeyer, I., Hayman, N., Lange, D., Peirce, C., Papenberg, C., Van Avendonk, H., …Dannowski, A. (2019). Constraining the maximum depth of brittle deformation at slow- and ultraslow-spreading ridges using microseismicity. Geology, 47(11), 1069-1073. https://doi.org/10.1130/g46577.1

The depth of earthquakes along mid-ocean ridges is restricted by the relatively thin brittle lithosphere that overlies a hot, upwelling mantle. With decreasing spreading rate, earthquakes may occur deeper in the lithosphere, accommodating strain with... Read More about Constraining the maximum depth of brittle deformation at slow- and ultraslow-spreading ridges using microseismicity.

Seismic investigation of an active ocean-continent transform margin: the interaction between the Swan Islands Fault Zone and the ultraslow-spreading Mid-Cayman Spreading Centre (2019)
Journal Article
Peirce, C., Robinson, A., Campbell, A., Funnell, M., Grevemeyer, I., Hayman, N., …Castiello, G. (2019). Seismic investigation of an active ocean-continent transform margin: the interaction between the Swan Islands Fault Zone and the ultraslow-spreading Mid-Cayman Spreading Centre. Geophysical Journal International, 219(1), 159-184. https://doi.org/10.1093/gji/ggz283

Does intermediate spreading-rate oceanic crust result from episodic transition between magmatic and magma-dominated, faulting-enhanced spreading? – the Costa Rica Rift example (2019)
Journal Article
Wilson, D., Robinson, A., Hobbs, R., Peirce, C., & Funnell, M. (2019). Does intermediate spreading-rate oceanic crust result from episodic transition between magmatic and magma-dominated, faulting-enhanced spreading? – the Costa Rica Rift example. Geophysical Journal International, 218(3), 1617-1641. https://doi.org/10.1093/gji/ggz184

Ocean-bottom seismograph and multichannel streamer wide-angle seismic data are jointly analysed and compared with reflection images, bathymetric maps and potential field data, to reveal the detailed structure of layer 2 of the oceanic crust formed at... Read More about Does intermediate spreading-rate oceanic crust result from episodic transition between magmatic and magma-dominated, faulting-enhanced spreading? – the Costa Rica Rift example.

Constraints on crustal structure of adjacent OCCs and segment boundaries at 13N on the Mid-Atlantic Ridge (2019)
Journal Article
Peirce, C., Reveley, G., Simao, N., Robinson, A., Funnell, M., Searle, R., …Reston, T. (2019). Constraints on crustal structure of adjacent OCCs and segment boundaries at 13N on the Mid-Atlantic Ridge. Geophysical Journal International, 217(2), 988-1010. https://doi.org/10.1093/gji/ggz074

The 13° N segment of the Mid-Atlantic Ridge is an example of a morphologically well-studied slow spreading ridge segment populated with oceanic core complexes (OCCs). In this paper we present the results of a ∼200 km-long 2D seismic and gravity trans... Read More about Constraints on crustal structure of adjacent OCCs and segment boundaries at 13N on the Mid-Atlantic Ridge.

The Mid-Atlantic Ridge near 13º20’N: High-Resolution Magnetic and Bathymetry Imaging (2018)
Journal Article
Searle, R., MacLeod, C., Peirce, C., & Reston, T. (2019). The Mid-Atlantic Ridge near 13º20’N: High-Resolution Magnetic and Bathymetry Imaging. Geochemistry, Geophysics, Geosystems, 20(1), 295-313. https://doi.org/10.1029/2018gc007940

We describe detailed magnetic and bathymetric studies around 13°N on the Mid‐Atlantic Ridge, a site of extensive detachment faulting. Inversion of closely spaced sea surface magnetic anomalies reveals a disorganized pattern of magnetization, with ano... Read More about The Mid-Atlantic Ridge near 13º20’N: High-Resolution Magnetic and Bathymetry Imaging.