Impact of global seismicity on sea level change assessment

We analyze the effect of seismic activity on sealevel variations, by computing the time-dependent vertical crustal movement and geoid change due to coseismic deformations and postseismic relaxation effects. Seismic activity can affect both the absolute sealevel, by changing the Earth gravity field and hence the geoid height, and the relative sealevel, i.e. the radial distance between seafloor and geoid level. By using comprehensive seismic catalogues we assess the net effect of seismicity on tidal relative sealevel measurements as well as on the global oceanic surfaces, and we obtain an estimate of absolute sealevel variations of seismic origin. Our results confirm that, on a global scale, most of the signal is associated with few giant thrust events, and that RSL estimates obtained using tide-gauge data can be sensibly affected by the seismic driven sealevel signal. The recent measures of sealevel obtained by satellite altimetry show a wide regional variation of sealevel trends over the oceanic surfaces, with the largest deviations from the mean trend occurring in tectonically active regions. While our estimates of average absolute sealevel variations turn out to be orders of magnitude smaller than the satellite measured variations, we can still argue that mass redistribution associated with aseismic tectonic processes may contribute to the observed regional variability of sealevel variations.Comment: 34 pages, submitted to Journal of Geophysical Researc

HPC in global geodynamics: Advances in normal-mode analytical modeling

Analytical models based on normal-mode theory have been successfully employed for decades in the modeling of global response of the Earth to seismic dislocations, postglacial rebound and wave propagation. Despite their limited capabilities with respect to fully numerical approaches, they are yet a valuable modeling tool, for instance in benchmarking applications or when automated procedures have to be implemented, as in massive inversion problems when a large number of forward models have to be solved. The availability of high-performance computer systems ignited new applications for analytical modeling, allowing to remove limiting approximations and to carry out extensive simulations on large global datasets

Extracting the top-quark running mass using ttˉt\bar{t}+1-jet events produced at the Large Hadron Collider

We present the calculation of the next-to-leading order QCD corrections for top-quark pair production in association with an additional jet at hadron colliders, using the modified minimal subtraction scheme to renormalize the top-quark mass. The results are compared to measurements at the Large Hadron Collider run I. In particular, we determine the top-quark running mass from a fit of the theoretical results presented here to the LHC data

Hemangioendotelioma epitelioide solitario de hueso: Aportación de dos nuevos casos

El hemangioendotelioma epitelioide, caracterizado por células endoteilales epitelioides o "histiocitoides", en su variantes ósea solitaria, es una neoplasia de difícil diagnóstico, pronóstico incierto y evolución impredecible. De etiología poco clara e infrecuente en su localización ósea, sigue un curso clínico muy variable. La multicentricidad y la multifocalidad son dos características fundamentales de esta neoplasia, con predilección por las extremidades inferiores por ello, las lesiones solitarias pueden ser difíciles de diagnosticar confundiéndose con carcinomas metastáticos y otras entidades. Su tratamiento no está claramente establecido y su potencial de agresividad es impredecible, hasta tal punto que la cirugía ablativo puede ser más frecuente de lo hsta ahora publicado. Su diagnóstico y tratamiento deben ser exhaustivos ya que se han descrito comportamientos agresivos en tumores de bajo grado de malignidad con evoluciones insidiosas que terminan en recidivas tumorales. Los tres pilares en que se debe basar el tratamiento son: la resección en bloque, cobertura completa del defecto óseo y radioterapia postoperativa.Solitary epithelioid hemangioendothelioma of bone, characterized by epitheliolid or "histiocytoid" endotelial cells has a difficult diagnosis, confusing or unknown prognosis and unpredictable outcome. Infrequently recognized in bone, its etiology is not clear with a very variable clinical course. Multicentricity andmultifocality are two characteristics of this tumour, with a predilection for lower extremity bones. Therefore solitary lesions may be difficult to diagnose being confused with metastatic carcinomas and other entities. Its treatment is not well established. Their aggressive potential is unpredictable, to such a point that ablative surgery may be more frequent than previous reports have shown. Its diagnosis and treatment must be exhaustive as aggressive behaviour with insidious evolutions ending as relapses have been described the three pillar on which we will base its treatment are: in-block resection, complete coverage of the residual bone lesion and postoperative radiotherapy