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Características sismotectónicas del sismo de Chupaca del 18 de julio 2026 (M5.4) Provincia de Chupaca – Región Junín
(Instituto Geofísico del Perú, 2026-08) Tavera, Hernando; Nina Figueroa, Vilma; Pamo, Rodrigo; Cutipa, Dayana; Suclla, Wilfredo; Cuya, Ademir; Mamani, Cristian
El 18 de julio 2026 (21horas 24m; hora local), ocurre un sismo de magnitud M5.4 con epicentro a 14 km al S-SO de la ciudad de Chupaca (región Junín), siendo el sacudimiento del suelo percibido en una radio de 150 km. El sismo ocurrió a una profundidad de 9.5 km y está asociado a la reactivación temporal de la falla tectónica Altos del Mantaro ubicada en la Cordillera Occidental, extremo occidental del Valle del Mantaro. La secuencia de réplicas considero la ocurrencia de una réplica de magnitud M5.0 con epicentro a 19 km en dirección SO de la ciudad de Chupaca con foco a una profundidad de 9 km. El sismo y replicas produjeron el sacudimiento del cerro Pucca generando derrumbes de piedras y tierra, así como procesos de licuación de suelos y movimientos de masa en áreas en calles y áreas de pendientes altas. Los valores de aceleración del suelo estimados en el área epicentral fueron en promedio de 75 cm/seg2 , suficiente para producir en respuesta, daños parciales o el colapso de estructuras de adobe propias de la zona. La distribución espacial del daño no obedeció a un patrón de atenuación radial uniforme desde el epicentro. Por el contrario, los daños se presentaron de manera altamente sectorizada y heterogénea, evidenciando una fuerte influencia de las condiciones locales del suelo o efectos de sitio. La distribución de los periodos de respuesta del suelo y su amplificación son coherentes con los daños observados en estructuras de adobe y albañilería en cada distrito evaluado.
Recycled PET as a Modular System for Coastal Slope Stabilisation: A Preliminary Numerical Climate-Adaptation Approach in Chucuito, Callao
(MDPI, 2026-08-11) Vilchez Vilchez, Tito Roberto; Velásquez Hidalgo, Oswaldo; Chirinos Flores, Maria Cecilia; Yabar Torres, Guisela; Villena Mávila, Manuel Félix; Herrera Ayoque, Dan Nelson; Machado Huanca, Adler Deker; Vilchez Chumpitaz, Hans Aarón; Gómez Avalos, Juan Carlos
Vulnerable coastal urban margins face overlapping pressures from erosion, climate change, and plastic-waste accumulation. This study presents a screening-level numerical assessment of a hollow modular unit made of a recycled polyethylene terephthalate (PET)– concrete composite, proposed for coastal slope protection and stabilisation in Chucuito, Callao, Peru. A limit-equilibrium baseline indicates that the unprotected slope is marginal to unstable under the site’s seismic demand, motivating the evaluation of a surface-protection concept through a parallel, one-way finite element analysis–computational fluid dynamics (FEA–CFD) framework applied at three slope angles (60◦ , 53◦ , 45◦ ). The FEA structuralresponse screening indicates consistent trends across configurations under an equivalent impact load and the adopted basal restraint. For the hydraulic comparison, inlet velocities of 3, 5 and 7 m/s were anchored to the site-specific Delft3D inundation modelling (site maximum 5 m/s), with a conservative 10 m/s upper bound; relative to a rip-rap reference, the hollow configuration suggests midpoint run-up velocity reductions of approximately 52% at θ = 53◦ under the conservative scenario and ≈57% at 3 and 5 m/s, falling to ≈25% at 7 m/s with overlapping ranges and the simulated free surface exceeding the crest. The CFD free-surface elevations show order-of-magnitude consistency with an indicative EurOtopbased run-up benchmark used as a consistency check rather than as hydraulic validation. Independent of this hydraulic comparison, the hollow geometry saves ≈ 62% of the material volume relative to an equivalent solid concrete block, valorises ≈ 793 post-consumer PET bottles per unit at a 10% dosage, and suggests a 42–58% embodied-CO2 reduction relative to the same solid-concrete reference, driven mainly by the hollow geometry rather than by the PET substitution itself. The results are internally consistent but not experimentally validated and are intended as a comparative baseline to guide subsequent experimental and field studies, in line with Sustainable Development Goals (SDG) 11, 12 and 13.
Updated 3D resistivity model of the Tres Vírgenes geothermal field (Mexico) from magnetotelluric data: Implications for geothermal exploration and development
(Elsevier, 2026-01) Gonzalez-Garcia, Javier; Unsworth, Martyn; Campos-Enríquez, Oscar; Antayhua Vera, Yanet Teresa
A case study is presented involving the 3D inversion of a legacy magnetotelluric (MT) dataset from the Tres Vírgenes Volcanic Complex (TVVC), Baja California Sur, Mexico, which is a significant geothermal energy resource with an installed capacity of 10 MWe. The MT dataset consists of 76 stations acquired between 1992 and 1999 (bandwidth: 0.003 – 100 Hz), and was previously analyzed using 1D, 2D, and 3D approaches, revealing a layered resistivity structure. However, significant uncertainty surrounds the capability of this dataset to resolve deep resistivity structures associated with the magmatic system. This study applies a 3D inversion approach that incorporates topography and bathymetry and inversion tests to assess the sensitivity of the model features to the data. Well-logs and laboratory measurements of resistivity were used to constrain the interpretation. The integrated methodology enabled a more accurate delineation of the resistivity structure of the TVVC, mapping an extensive conductor primarily associated with a brine-saturated smectite clay cap (10 – 60 % clay fraction, 150 – 200 ◦C). Internal variability within the conductor suggests the presence of a small sill with andesitic mush (30 – 85 % melt fraction) north of El Azufre Volcano, possibly associated with sulphate-type hydrothermal activity along the El Azufre Fault Zone. Moreover, a zone of lower resistivity to the north of the main conductor suggests a possible intrusion of seawater that remains isolated from the main hydrothermal systems in TVVC. Sensitivity tests indicate that the dataset lacks the resolution required to image deep bodies beneath the main conductor; consequently, deep conductors modelled in previous studies are likely inversion artifacts, and are unrelated to the deep magmatic system. These findings have the potential to improve the delineation of the geothermal system boundaries, and provide insights for future geothermal and magnetotelluric exploration.
J-ARGUS: Project Description and Status of the New Tristatic Radar System
(Institute of Electrical and Electronics Engineers, 2026-06-11) Inonan, Marcos; Rodrigues, Fabiano; Biggins, Evan; Scipión, Danny; Milla, Marco; Torres, David; Hysell, David; Chau, Jorge; Obenberger, Kenneth
The Jicamarca-Augmented Radar for Geospace and Upper Atmosphere Studies (J-ARGUS) is a project designed to expand the observational capabilities of the 50 MHz radar at the Jicamarca Radio Observatory (JRO) by transforming it into a tristatic system. This will be achieved by the deployment of two receive-only stations, located approximately 170 km east of Jicamarca, in Huancayo, and about 50 km to the south of Jicamarca, in Santa Maria, Lima. The construction of each station is based on the Long Wavelength Array (LWA) system, which consists of 256 cross-dipole antennas that operate over a broad frequency range (3−88MHz) and feature electronically steerable beams.
Space Weather Effects From Moderate to SevereGeomagnetic Storms in October 2024 Over the LatinAmerican Sector
(Wiley, 2026-05-30) Carmo, C. S.; Dai, L.; Wrasse, C. M.; Barros, D.; Takahashi, H.; Costa, J. R.; Vital, L. F. R.; Jauer, P. R.; De la Jara, César; Carrasco, A. J.; Figueiredo, C. A. O. B.; Wang, C.; Li, H.; Liu, Z.
This study presents a detailed case study of the ionospheric impacts of moderate (G2) and severe(G4) geomagnetic storms over the Latin American sector, with particular emphasis on the formation andsuppression of equatorial plasma bubbles (EPBs). The moderate storm of 7–8 October, 2024, presented a rarecase of EPB suppression despite favorable conditions, including a pronounced pre‐reversal enhancement (PRE),with vertical plasma drifts exceeding 40 m/s. Post‐midnight EPBs were observed exclusively in the western sideof the Latin American sector. The observed suppressions may be associated with the influence of meridionalwinds and the presence of an Es layer near the onset time of EPBs. In contrast, the severe storm of 10–11October, 2024, triggered super and long‐lasting EPB across both eastern and western sectors. The enhancementof EPBs during this event is attributed to the combined effects of an undershielding prompt penetration electricfield (PPEF) and disturbance dynamo electric field (DDEF). Moreover, the storm's main phase was marked by apronounced expansion of the Equatorial Ionization Anomaly (EIA) and a significant increase in total electroncontent (TEC), followed by a decrease during the recovery phase. These findings reinforce the importance ofregional and local factors in ionospheric storm‐time responses and suggest the need for further statistical studiesto improve EPB occurrence forecasts.