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All Outputs (115)

Classification of Bryde's whale individuals using high-resolution time-frequency transforms and support vector machines. (2025)
Journal Article
Tary, J. B., Peirce, C., & Hobbs, R. W. (2025). Classification of Bryde's whale individuals using high-resolution time-frequency transforms and support vector machines. The Journal of the Acoustical Society of America, 157(3), 2091-2101. https://doi.org/10.1121/10.0036223

Whales generate vocalizations which may, deliberately or not, encode caller identity cues. In this study, we analyze calls produced by Bryde's whales and recorded by ocean-bottom arrays of hydrophones deployed close to the Costa Rica Rift in the Pana... Read More about Classification of Bryde's whale individuals using high-resolution time-frequency transforms and support vector machines..

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.

Seismic wave propagation around subsurface igneous sill complexes (2023)
Journal Article
Sanford, O., Schofield, N., Hobbs, R., & Brown, R. (2023). Seismic wave propagation around subsurface igneous sill complexes. Marine and Petroleum Geology, 152, Article 106232. https://doi.org/10.1016/j.marpetgeo.2023.106232

Imaging both within and beneath subsurface igneous sill complexes is a seismic exploration challenge. A significant aspect of this challenge is due to a lack of understanding of the interaction between the heterogeneous geological structures and the... Read More about Seismic wave propagation around subsurface igneous sill complexes.

Abrupt episode of mid-Cretaceous ocean acidification triggered by massive volcanism (2023)
Journal Article
Jones, M., Sageman, B., Selby, D., Jacobson, A., Batenburg, S., Riquier, L., MacLeod, K., Huber, B., Bogus, K., Tejada, M., Kuroada, J., & Hobbs, R. (2023). Abrupt episode of mid-Cretaceous ocean acidification triggered by massive volcanism. Nature Geoscience, 16(2), 169-174. https://doi.org/10.1038/s41561-022-01115-w

Large igneous province volcanic activity during the mid-Cretaceous approximately 94.5 million years ago triggered a global-scale episode of reduced marine oxygen levels known as Oceanic Anoxic Event 2. It has been hypothesized that this geologically... Read More about Abrupt episode of mid-Cretaceous ocean acidification triggered by massive volcanism.

Uncertainties in Ray-Tracing Tomography Models Used for Sub-Basalt Seismic Imaging (2022)
Journal Article
Sanford, O., Hobbs, R., Brown, R., & Schofield, N. (2023). Uncertainties in Ray-Tracing Tomography Models Used for Sub-Basalt Seismic Imaging. Pure and Applied Geophysics, 180(1), 145-156. https://doi.org/10.1007/s00024-022-03199-2

Sequences of buried basalt lavas found along continental margins may be associated with hydrocarbon deposits. However, they have heterogeneous velocity and density structures that degrade seismic imaging of basalt and sub-basalt structures and make t... Read More about Uncertainties in Ray-Tracing Tomography Models Used for Sub-Basalt Seismic Imaging.

Temperature and Salinity Inverted for a Mediterranean Eddy Captured With Seismic Data, Using a Spatially Iterative Markov Chain Monte Carlo Approach (2021)
Journal Article
Xiao, W., Sheen, K. L., Tang, Q., Shutler, J., Hobbs, R., & Ehmen, T. (2021). Temperature and Salinity Inverted for a Mediterranean Eddy Captured With Seismic Data, Using a Spatially Iterative Markov Chain Monte Carlo Approach. Frontiers in Marine Science, 8, Article 734125. https://doi.org/10.3389/fmars.2021.734125

Ocean submesoscale dynamics are thought to play a key role in both the climate system and ocean productivity, however, subsurface observations at these scales remain rare. Seismic oceanography, an established acoustic imaging method, provides a uniqu... Read More about Temperature and Salinity Inverted for a Mediterranean Eddy Captured With Seismic Data, Using a Spatially Iterative Markov Chain Monte Carlo Approach.

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.

Contourite processes associated with the overflow of Pacific Deep Water within the Luzon Trough: Conceptual and regional implications (2021)
Journal Article
Yin, S., Javier Hernández-Molina, F., Hobbs, R., Gao, J., Ding, W., Yang, C., Lin, L., Zhang, H., Wu, Z., & Li, J. (2021). Contourite processes associated with the overflow of Pacific Deep Water within the Luzon Trough: Conceptual and regional implications. Deep Sea Research Part I: Oceanographic Research Papers, 170, Article 103459. https://doi.org/10.1016/j.dsr.2020.103459

Overflows through oceanic gateways govern the exchange of water masses in the world's ocean basins. These exchanges also involve energy, salinity, nutrients, and carbon. As such, the physical features that control overflow can exert a strong influenc... Read More about Contourite processes associated with the overflow of Pacific Deep Water within the Luzon Trough: Conceptual and regional implications.

Evolution of the Southwest Australian Rifted Continental Margin During Breakup of East Gondwana: Results from IODP Expedition 369 (2020)
Journal Article
Harry, D., Tejada, M., Lee, E., Wolfgring, E., Wainman, C., Brumsack, H., Schnetger, B., Kimura, J., Riquier, L., Borissova, I., Hobbs, R., Jiang, T., Li, Y., Maritati, A., Martinez, M., Richter, C., Tagliaro, G., & White, L. (2020). Evolution of the Southwest Australian Rifted Continental Margin During Breakup of East Gondwana: Results from IODP Expedition 369. Geochemistry, Geophysics, Geosystems, 21(12), Article e2020GC009144. https://doi.org/10.1029/2020gc009144

International Ocean Discovery Program Expedition 369 drilled four sites on the southwestern Australian continental margin, in the deep water Mentelle Basin (MB) and on the neighboring Naturaliste Plateau (NP). The drillsites are located on continenta... Read More about Evolution of the Southwest Australian Rifted Continental Margin During Breakup of East Gondwana: Results from IODP Expedition 369.

Investigating the Goban Spur rifted continental margin, offshore Ireland, through integration of new seismic reflection and potential field data (2020)
Journal Article
Yang, P., Welford, J. K., Peace, A. L., & Hobbs, R. (2020). Investigating the Goban Spur rifted continental margin, offshore Ireland, through integration of new seismic reflection and potential field data. Tectonophysics, 777, Article 228364. https://doi.org/10.1016/j.tecto.2020.228364

The Goban Spur, offshore Ireland, is a magma-poor rifted continental margin conjugate to the well-studied Newfoundland margin, offshore Canada. Published studies demonstrated that a 70-km-wide zone of exhumed serpentinized mantle lies between oceanic... Read More about Investigating the Goban Spur rifted continental margin, offshore Ireland, through integration of new seismic reflection and potential field data.

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., Harris, R., Hobbs, R., Peirce, C., & 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.

Detecting changes at the leading edge of an interface between oceanic water layers (2019)
Journal Article
Tang, Q., Tong, V. C., Hobbs, R. W., & Morales Maqueda, M. Á. (2019). Detecting changes at the leading edge of an interface between oceanic water layers. Nature Communications, 10(1), Article 4674. https://doi.org/10.1038/s41467-019-12621-8

Many physical phenomena in the ocean involve interactions between water masses of different temperatures and salinities at boundaries. Of particular interest is the characterisation of finescale structure at the marginal interaction zones of these bo... Read More about Detecting changes at the leading edge of an interface between oceanic water layers.

A lower to middle Eocene astrochronology for the Mentelle Basin (Australia) and its implications for the geologic time scale (2019)
Journal Article
Vahlenkamp, M., De Vleeschouwer, D., Batenburg, S. J., Edgar, K. M., Hanson, E., Martinez, M., Pälike, H., MacLeod, K. G., Li, Y.-X., Richter, C., Bogus, K., Hobbs, R. W., & Huber, B. T. (2020). A lower to middle Eocene astrochronology for the Mentelle Basin (Australia) and its implications for the geologic time scale. Earth and Planetary Science Letters, 529, Article 115865. https://doi.org/10.1016/j.epsl.2019.115865

The geologic time scale for the Cenozoic Era has been notably improved over the last decades by virtue of integrated stratigraphy, combining high-resolution astrochronologies, biostratigraphy and magnetostratigraphy with high-precision radioisotopic... Read More about A lower to middle Eocene astrochronology for the Mentelle Basin (Australia) and its implications for the geologic time scale.

Evidence for non-marine Jurassic to earliest Cretaceous sediments in the pre-breakup section of the Mentelle Basin, southwestern Australia (2019)
Journal Article
Wainman, C., Borissova, I., Harry, D., Hobbs, R., Mantle, D., Maritati, A., Lee, E., & Scientists, T. E. 3. (2020). Evidence for non-marine Jurassic to earliest Cretaceous sediments in the pre-breakup section of the Mentelle Basin, southwestern Australia. Australian Journal of Earth Sciences, 67(1), 89-105. https://doi.org/10.1080/08120099.2019.1627581

The Mentelle Basin, located off the southwestern continental Australian margin, is an under-explored deep-water basin that developed during the breakup of eastern Gondwana in the Middle Jurassic through to the Early Cretaceous. There is a high degree... Read More about Evidence for non-marine Jurassic to earliest Cretaceous sediments in the pre-breakup section of the Mentelle Basin, southwestern Australia.

Evolution of Heat Flow, Hydrothermal Circulation and Permeability on the Young Southern Flank of the Costa Rica Rift (2019)
Journal Article
Kolandaivelu, K., Harris, R., Lowell, R., Robinson, A., Wilson, D., & Hobbs, R. (2020). Evolution of Heat Flow, Hydrothermal Circulation and Permeability on the Young Southern Flank of the Costa Rica Rift. Geophysical Journal International, 220(1), 278-295. https://doi.org/10.1093/gji/ggz278

We analyze 67 new conductive heat flow measurements on the southern flank of the Costa Rica Rift (CRR). Heat flow measurements cover five sites ranging in oceanic crustal age between approximately 1.6 and 5.7 Ma, and are co-located with a high-resolu... Read More about Evolution of Heat Flow, Hydrothermal Circulation and Permeability on the Young Southern Flank of the Costa Rica Rift.

Monte Carlo sampling for error propagation in linear regression and applications in isochron geochronology (2018)
Journal Article
Li, Y., Zhang, S., Hobbs, R., Caiado, C., Sproson, A., Selby, D., & Rooney, A. (2019). Monte Carlo sampling for error propagation in linear regression and applications in isochron geochronology. Science Bulletin, 64(3), 189-197. https://doi.org/10.1016/j.scib.2018.12.019

Geochronology is essential for understanding Earth’s history. The availability of precise and accurate isotopic data is increasing; hence it is crucial to develop transparent and accessible data reduction techniques and tools to transform raw mass sp... Read More about Monte Carlo sampling for error propagation in linear regression and applications in isochron geochronology.

Geothermal heating in the Panama Basin. Part I: hydrography of the basin (2018)
Journal Article
Banyte, D., Morales Maqueda, M., Hobbs, R., Smeed, D., Megann, A., & Recalde, S. (2018). Geothermal heating in the Panama Basin. Part I: hydrography of the basin. Journal of Geophysical Research: Oceans, 123(10), 7382-7392. https://doi.org/10.1029/2018jc013868

The Panama Basin serves as a laboratory to investigate abyssal water upwelling. The basin has only a single abyssal water inflow pathway through the narrow Ecuador Trench. The estimated critical inflow through the Trench reaches 0.34 ± 0.07 m s−1, re... Read More about Geothermal heating in the Panama Basin. Part I: hydrography of the basin.