
Fábio L. Dias, Marcelo Assumpção, Pedro S. Peixoto, Marcelo Bianchi, Bruno Collaço, Jackson Calhau,
Abstract Decrease of seismic noise level, after reduction of traffic due to the COVID‐19 pandemic, has been observed worldwide. The possibility of using seismic noise as another proxy to estimate social isolation was tested with a station within Rio de Janeiro city. We used the isolation index measured from smartphone movement to calibrate the seismic noise levels and estimated an Isolation Seismic Index, ISI (% of the population at home), using the seismic noise energy. Noise levels best correlate ...
Tópico(s): Earthquake Detection and Analysis
2020 - American Geophysical Union | Geophysical Research Letters

Hans Agurto‐Detzel, Marcelo Bianchi, Marcelo Assumpção, Martín Schimmel, Bruno Collaço, Caio Ciardelli, José Roberto Barbosa, Jackson Calhau,
Abstract The collapse of a mine tailings dam and subsequent flood in SE Brazil on 5 November 2015 was preceded by a small‐magnitude seismic sequence. In this report, we explore the spatiotemporal associations between the seismic events and the accident and discuss their possible connection. We also analyze the signals generated by the turbulent mudflow, as recorded by the Brazilian Seismographic Network (RSBR). In light of our observations, we propose as possible contributing factor for the dam collapse ...
Tópico(s): Seismic Waves and Analysis
2016 - American Geophysical Union | Geophysical Research Letters

María Laura Rosa, Bruno Collaço, Marcelo Assumpção, Nora Cristina Sabbione, Gerardo Sánchez,
We present the results of surface-wave group velocity tomography for South America, using dispersion curves from a) regional earthquakes recorded at permanent and portable stations and b) inter-station cross-correlation of ambient noise for stations in and around the Paraná and Chaco-Paraná basins, achieving better path coverage and a more azimuthally uniform distribution. A 2D group velocity tomographic inversion, using two different smoothing criteria (first- and second-derivative smoothing) was ...
Tópico(s): earthquake and tectonic studies
2015 - Elsevier BV | Journal of South American Earth Sciences

Marlon Pirchiner, Bruno Collaço, Jackson Calhau, Marcelo Assumpção, João Carlos,
In geophysics and seismology, raw data need to be processed to generate useful information that can be turned into knowledge by researchers. The number of sensors that are acquiring raw data is increasing rapidly. Without good data management systems, more time can be spent in querying and preparing datasets for analyses than in acquiring raw data. Also, a lot of good quality data acquired at great effort can be lost forever if they are not correctly stored. Local and international cooperation will ...
Tópico(s): Seismic Imaging and Inversion Techniques
2011 - National Institute of Geophysics and Volcanology | Annals of Geophysics

Taghi Shirzad, Marcelo Assumpção, Bruno Collaço, Jackson Calhau, Marcelo Bianchi, José Roberto Barbosa, Raphael Fernandes Prieto, Dionı́sio Uendro Carlos,
We applied a combination of ambient seismic noise and classical earthquake-receiver techniques to characterize the shallow crustal shear-wave velocities in the Quadrilátero Ferrífero (QF), Minas Gerais state, SE Brazil, to a depth of about 4 km. Ambient seismic noise was recorded by up to 26 stations. To improve the signal of the extracted empirical Green's function (EGF), we correlated short time windows of 10 min with 70% overlapping before stacking. To test the accuracy of the retrieved EGF signals, ...
Tópico(s): Seismology and Earthquake Studies
2022 - | Brazilian Journal of Geophysics

Marcelo Assumpção, J. Carvalho, Fábio L. Dias, Stéphane Drouet, José Roberto Barbosa, Marcelo Bianchi, Bruno Collaço,
Magnitude conversions between different scales are important for comparison of seismic activity between different regions, homogenization of earthquake catalogs for seismic hazard calculations, and use of ground motion relations derived from other regions. Despite the trend of adopting Mw as the standard, reference magnitude scale, other scales are still much used for practical reasons and ease of calculation, such as the local ML for events detected by local networks, and short-period teleseismic ...
Tópico(s): High-pressure geophysics and materials
2022 - Elsevier BV | Journal of South American Earth Sciences

Marcelo Assumpção, José Alexandre A. Nogueira, J. Carvalho, Fábio L. Dias, Nathalya Shimomura Ito, Lúcio Quadros, José Roberto Barbosa, Marcelo Bianchi, Bruno Collaço, Jackson Calhau,
The 4.5 mb Amargosa earthquake was the largest event to occur in the state of Bahia, NE Brazil, in more than 100 years. It caused intensity VI MM in the epicentral area and was felt up to more than 200 km away. A previously published focal mechanism determination had suggested a normal faulting event at about 10 km depth. However, our detailed analyses of regional and teleseismic records show, in fact, a reverse faulting mechanism and a very shallow depth of about 1 km. The shallow hypocentral depth ...
Tópico(s): High-pressure geophysics and materials
2023 - Elsevier BV | Journal of South American Earth Sciences
Taghi Shirzad, Marcelo Assumpção, E. Debayle, Marcelo Bianchi, Bruno Collaço, Jackson Calhau, Gabriel Negrucci Dragone, Carlos Alberto Moreno Chaves,
Tópico(s): earthquake and tectonic studies
2024 - Elsevier BV | Tectonophysics
Lucas Mansano Sarquis, Arnon César Brunet SCHULTZE, BRUNO BERARDI GAZOLA, Iwan Augusto Collaço, Alan Junior de Aguiar, H. Fontes,
ABSTRACT Objective: to describe, analyze, and trace the epidemiological profile for cardiac trauma victims on a referral trauma hospital of a major urban center. Methods: a case series study to review, describe, compile and analyze medical records of all patients sustaining traumatic cardiac injuries, from January 2015 to January 2020 admitted to the referral trauma hospital of Curitiba, Brazil. Patients sustaining traumatic heart injuries were identified using the hospitals database. Patients who ...
Tópico(s): Trauma and Emergency Care Studies
2022 - Brazilian College of Surgeons | Revista do Colégio Brasileiro de Cirurgiões
Adonis Nasr, Iwan Augusto Collaço, Bruno Guilherme Zampiri de Pieri, Lucas Fernando Uratani, Selen Socrepa Malutta,
RESUMO Objetivo Estabelecer o perfi l epidemiológico do paciente que chega ao Hospital do Trabalhador pelo resgate aéreo. Métodos Estudo observacional retrospectivo por análise de dados secundários. Separamos 50 prontuários de pacientes que chegaram ao hospital por helicóptero, desde a abertura do heliponto, sendo descartados prontuários incompleto/ divergentes, seguindo roteiro com questões fechadas. Analisamos as variáveis: Sexo; idade; hora do atendimento; etiologia; escore na ECG, FC, PA sistólica ...
Tópico(s): Traffic and Road Safety
2012 - | Panamerican Journal of Trauma Critical Care & Emergency Surgery

Marcelo Assumpção, J. Carvalho, Fábio L. Dias, Stéphane Drouet, José Roberto Barbosa, Marcelo Bianchi, Bruno Collaço,
Magnitude conversions between different scales are important for comparison of seismic activity between different regions, homogenization of earthquake catalogs for seismic hazard calculations, and use of ground motion relations derived from other regions. Despite the trend of adopting Mw as the standard, reference magnitude scale, other scales are still much used for practical reasons and ease of calculation, such as the local ML for events detected by local networks, and short-period teleseismic ...
Tópico(s): Seismology and Earthquake Studies
2022 - RELX Group (Netherlands) | SSRN Electronic Journal
María Laura Rosa, Bruno Collaço, Marcelo Assumpção, Nora Cristina Sabbione,
En este trabajo se presentan los resultados de la tomografia de velocidad de grupo de las ondas superficiales, para la region de la cuenca de Chaco-Parana. Estudios previos mediante ondas superficiales en la region de la cuenca de Chaco (e.g., Snokes and James, 1997; Feng et al, 2004, 2007) estimaron la profundidad del Moho y obtuvieron una anomalia de baja velocidad en el manto litosferico. Sin embargo la estructura sismica de la corteza y el manto superior esta poco caracterizada en toda la region ...
Tópico(s): earthquake and tectonic studies
2016 - | GeoActa

Sofia Alessandra Kotsifas, Luisa Aparecida Cornelsen, Bruno Perotta, Luiz Martins Collaço, Maria Luiza de Medeiros Amaro, Aristides Schier DA CRUZ,
Tópico(s): Erythrocyte Function and Pathophysiology
2022 - | REVISTA MÉDICA DO PARANÁ

Adonis Nasr, Phillipe Abreu, Flávio Daniel Saavedra Tomasich, Bruno Eduardo Scheffer Pinto, Marília França Madeira Manfrinato, Luísa Bordignon Oliveira, Helena Slongo, Juliana Boni Cruz, Iwan Augusto Collaço,
ABSTRACT Background Traffic injuries are among the main causes of death worldwide. Even with the advances in technology, there are still 50% of deaths that cannot be reduced by medical care improvement. These important injuries can though be reduced by prevention of trauma. One of the best ways to address this issue is through incorporating preventive measures to the daily routine of schools. It is the aim of this study to assess children's perception on traumatic events and to introduce a cost- ...
Tópico(s): Public Health Policies and Education
2012 - | Panamerican Journal of Trauma Critical Care & Emergency Surgery