Oxygen influence on benthic communities

 

Meiofauna in sandy sediments

 

Open Science Conference on Eastern Boundary Upwelling Systems (EBUS): Past, Present and Future & Second International Conference on the Humboldt Current System September 19 - 23, 2022

The Open Science Conference on Eastern Boundary Upwelling Systems (EBUS): Past, Present and Future and the Second International Conference on the Humboldt Current System are planned for September 19 - 23 in Lima, Peru. Although the conference aims to be in-person, options for virtual participation will be provided.

The meeting will bring together PhD students, early career scientists and world experts to understand, review, and synthesize what is known about dynamics, sensitivity, vulnerability and resilience of Eastern Boundary Upwelling Systems and their living resources to climate variability, change and extreme events.

More information

Brownian motion in diatoms. Marine sediments from Peru

 

Working on fossilized oysters in Northern Peru (Tumbes)

Fossilized oysters (organisms living on the earth more than 500 million years) can be used not only to explore the diversity and evolution of this biological lineage in the past but also to use them as indicators of past climatic changes. Here you can see a sample of the hardworking of my colleague and friend, the scientist Ernesto Fernandez (Peruvian Institute of Marine Research -IMARPE) revealing those species that have been sedimented in northern Peru (Tumbes, ~3°30' S). Results coming soon!

Fossilized oyster #1

Fossilized oyster #2

Fossilized oyster #3

Fossilized oyster #3

Working on specific samples.

A battery of sieves used to microfossils and sedimentology

Ernesto at work (by night! See through the window!)

La Revolución de la Algas - PNUD Perú

LA REVOLUCIÓN DE LAS ALGAS by PNUD Perú on Exposure

Seafloor Features & Landforms

[Off Topic] -- 10 Compromisos por una Pesca Responsable y Sostenible

Excelente iniciativa, y fuerza de opinión, para promover el buen manejo y explotación de recursos marinos en Perú

Sin embargo, agrego lo siguiente (desde otra perspectiva):

 

Interesting articles - NatureGeoscience /May-Jun

Tectonics: Unexpected Andean earthquakes

• Nadine McQuarrie

Nature Geoscience 4, 357–358 (2011) doi:10.1038/ngeo1167

 

Published online 31 May 2011

 

 Great earthquakes along the western, subduction zone boundary of the Andes Mountains in South America are expected. Measurements of surface motion along the eastern boundary highlight the potential for equally large earthquakes in the east. 

 

Subject terms:

• Structural geology, tectonics and geodynamics 

Link to the paper 

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 Orogenic-wedge deformation and potential for great earthquakes in the central Andean backarc

• Benjamin A. Brooks, Michael Bevis, Kelin Whipple, J Ramon Arrowsmith, James Foster, Tomas  Zapata, Eric Kendrick, Estella Minaya, Arturo Echalar, Mauro Blanco, Pablo Euillades, Mario Sandoval & Robert J. Smalley Jr

• Affiliations Contributions Corresponding author
• Nature Geoscience 4, 380–383 (2011) doi:10.1038/ngeo1143

Published online08 May 2011

 

Subduction of the Nazca plate beneath South America has driven the growth of the Andes Mountains. Subduction has routinely generated earthquakes larger than magnitude 8.0 along the western margin of the mountain belt¹, but the potential size of less frequent earthquakes in the eastern, backarc margin is unknown. Continued support of the high Andean Plateau at the centre of the Andes can be explained only if deformation of the backarc margin is ongoing^{2, 3, 4}. Here we present GPS data that record surface motions in the Subandean ranges that are part of the backarc margin. We find that the velocity of surface movement decreases sharply from west to east across the Subandean ranges. We suggest that a subhorizontal fault underlying the ranges slips freely at depth in the west, but is locked for up to 100 km in shallower sections further east. Analysis of fault scarps formed where the subhorizontal fault intersects the surface indicates that the fault has generated repeated large earthquakes. We suggest that rupture of the entire locked section of the fault could generate an earthquake of magnitude 8.7–8.9. We attribute the large seismic potential to the unusual width of the Subandean ranges, and suggest that deformation of the Subandean ranges, at a rate unmatched by erosion, causes the mountain range to widen.

Subject terms:

• Structural geology, tectonics and geodynamics 

Link to the paper