2022 Geophysical Journal International Student Author Award Winners announced

Three student authors, Gauthier Guerin, Paul Alberto Jarrin Tamayo and Solvi Thrastarson, have jointly won the 2022 Geophysical Journal International student author prizes. The
winning authors each received a cash prize and a certificate of recognition.

Gauthier Guerin’s paper, “Quantifying microseismic noise generation from coastal reflection of gravity waves recorded by seafloor DAS”, where DAS is distributed acoustic sensing, paves the way for the use of DAS data to monitor ocean-solid Earth interactions. The authors take advantage of a 41 km long submarine optical fibre cable off the coast of Toulon, France, to record both the amplitude and frequency of seafloor strains induced by ocean surface gravity waves, as well as secondary microseisms caused by the interaction of gravity waves incident and reflected from the coast. Read about their findings at https://academic.oup.com/gji/article/231/1/394/6595879.

A 3D map showing a section of the seafloor overlaid with graph lines and axes aruond the edge of the seafloor.
Map and perspective view of the seafloor MEUST- NUMerEnv cable (black curve). The red section is used to generate the f–k analyses in Fig. 5 of the paper, and the blue sections are used in Fig. 6. The Porquerolles oceanographic buoy is indicated by the red circle. The red triangle is the permanent seismic station POSAN.
Guerin et al.

Paul Jarrin’s paper is entitled “Current motion and deformation of the Nazca Plate: new constraints from GPS measurements”. Using continuous GPS monitoring from six sites, the authors determine relative movement along the plate boundaries, as well as consider the non-closure of the Pacific-Cocos-Nazca Plate circuit. Read more at https://academic.oup.com/gji/article/232/2/842/6695092

A map of South America overlaid with black lines depicting the tectonic plate boundaries of the Nazca, South American and Antarctic plates.
Map of the GPS stations used to define the stable South America (SOAM) reference frame. Red squares are sites used to compute the SOAM pole. Yellow arrows are velocities relative to SOAM reference frame. Ellipses show 95 per cent confidence. Red dashed line is the Malpelo microplate boundary proposed by Zhang et al. (2017). Black triangles in the inset plots show the location of GPS at Easter, Salas y Gomez, Santa Cruz and San Cristóbal islands. Orange arrow is the velocity reported by Kendrick et al. (2003) at the San Felix Island. ESC, Easter Seamount Chain.
Jarrin et al.


Solvi Thrastarson’s paper, “Data-adaptive global full-waveform inversion”, presents a novel approach to global-scale full-waveform inversion (FWI) that, the authors say, can reduce computational cost by over an order of magnitude, compared to previously published methods, without sacrificing physical and mathematical rigour. The authors present the LOng-Wavelength Earth model (LOWE) as the first global FWI constructed entirely from a spherically symmetric initial mantle structure as a showcase for the method. Read more at https://academic.oup.com/gji/article/230/2/1374/6554245 

A flow chart depicting the inversion workflow. The 4 main sections are categorised as ''Pick control group', 'misfits and gradients', 'Compute model update', and 'Prepare mini-batch'.
Schematic summary of the inversion workflow, implemented with the custom-built workflow manager Inversionson (Thrastarson et al. 2021b). The labels CG and NCG means that the box applies to control group events or non-control group events, respectively. The circular part of the workflow is repeated until some convergence criteria are reached.
Thrastarson et al.
Submitted by Gurjeet Kahlon on Fri, 16/12/2022 - 10:38