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The 2021 Tajogaite eruption in La Palma, Canary Islands, was accompanied by strong volcanic tremor. In September 2021, during the first two weeks of eruption, we deployed two small-aperture seismic arrays. We chose two locations around Montaña Caldero and Llano del Jable, located about 4 km SE and 2 km NE of the eruption site. The arrays were composed of 1 three-component and 9 vertical-component short-period seismometers, sampled at 100 sps by a 12-channel data acquisition system. In each array, the receivers were spread with an aperture of about 400 m. Although they operated intermittently due to failures in the power supply related to ash fall, they provided long time series of multichannel seismic data that allow for the characterization of the syn-eruptive tremor. The analysis of the recorded wavefields reveals a persistent tremor source linked to the activity of the eruptive vents. The main component of the wavefield in the 1-3 Hz frequency band propagates with apparent slowness around 1 s/km, impinging on the arrays from directions of ~300 and 260ºN, respectively. These directions are slightly deviated from the active vents azimuths, a fact that we attribute to propagation effects produced by the topography and heterogeneous velocity structure. Subtle variations in the apparent slowness and propagation azimuths are investigated using the relative slowness estimate method, that allows for a precise determination of the apparent slowness vectors., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)

RESUMEN Introducción: Las mastocitosis son un conjunto de trastornos clínicos, producidos todos ellos por una proliferación de mastocitos y su acumulación en varios órganos, entre los cuales el más común es la piel. Objetivo: Presentar la experiencia de pacientes con mastocitosis oriundos de Neuquén atendidos en el consultorio de Dermatología pediátrica en un período de 5 años. Detallar formas clínicas, presentación, topografía de las lesiones y evolución. Diseño: Se realizó un estudio descriptivo, retrospectivo de corte transversal, en el período comprendido entre abril de 2013 y marzo de 2018. Materiales y Método: Se revisaron las Historias clínicas digitales de pacientes con diagnóstico de mastocitosis cutánea que concurrieron al consultorio de dermatología infantil en la ciudad de Neuquén. Resultados: Se reunieron 23 casos de mastocitosis cutánea; de ellos el 60,87% corresponden a mastocitosis maculopapular y el 39,13%, a mastocitomas. No hubo diferencias significativas en cuanto al sexo. La mayoría de ellos presentó lesiones localizadas en tronco y miembros. El 95% tuvo signo de Darier positivo. Conclusiones: En nuestra muestra la presentación clínica más frecuente fue la mastocitosis maculopapular y la edad de inicio fue antes del año de vida en la totalidad de los pacientes. Las lesiones se distribuyeron en tronco y miembros en la mayoría de los casos. Los pacientes con mastocitomas solitarios permanecieron estables; en los casos de mastocitosis maculopapular se utilizaron antihistamínicos, con buena evolución. ABSTRACT Introduction: Mastocytosis is a heterogeneous group of disorders, characterized by a proliferation of mast cells and its accumulation in several organs, being the skin the most frequently affected one. Design: A descriptive, retrospective cross-sectional study, was conducted in the period from April 2013 to March 2018 in Neuquen city. Materials and Method: Electronic medical records of patients diagnosed with cutaneous mastocytosis who attended to the pediatric dermatology clinic in Neuquen city were reviewed. Results: We present 23 cases of cutaneous mastocytosis, of which 60,87% were maculopapular and 39,13% mastocytomas. There were no significant differences in terms of sexes. Most of them presented localized lesions in trunk and limbs. 95% had positive Darier´s sign. Conclusions: In our sample, the most frequent clinical presentation was maculopapular mastocytosis, and the age of onset was during the first year of life in all patients. The majority of lesions were distributed over the trunk and limbs. Patients with mastocytoma remained stable; maculopapular patients recieved antihistamines, with good evolution.