http://hdl.handle.net/10174/567 2026-04-04T07:34:00Z 2026-04-04T07:34:00Z Fontiela, João Bezzeghoud, Mourad Oliveira, Carlos Sousa Ferreira Amaral, Monica Nunes, João Carlos http://hdl.handle.net/10174/28430 2020-12-02T15:26:35Z 2020-11-01T00:00:00Z

Title: International Meeting 40 years of the 1980 Azores Earthquake, 6th - 7th October 2020 - Conference Report Authors: Fontiela, João; Bezzeghoud, Mourad; Oliveira, Carlos Sousa; Ferreira Amaral, Monica; Nunes, João Carlos Abstract: The main goal of the International Meeting “40 Years of the 1980 Azores Earthquake” was promoting a reflection of the earthquake of January 1st, 1980, and the advances since them on topics like seismology, seismic hazard, and risk, building rehabilitation and public policies. Nevertheless, due to the COVID-19 outbreak, the organizing committee decided that the meeting should be online and re- arrange the strategy, reduce the scientific program, and canceled the social one. The scientific program had five sessions, with six keynotes, 16 presentations, round table beyond the opening ceremony. All the sessions were live-streamed and available at https://azores4080meeting.wordpress.com as well as the proceedings and program. Instituto Superior Técnico, Universidade dos Açores and Universidade de Évora handled the organization of the conference.

2020-11-01T00:00:00Z Duque, Maria Rosa http://hdl.handle.net/10174/24067 2019-01-16T15:19:25Z 2018-03-31T23:00:00Z

Title: An attempt to obtain heat sources in the crust using non conventional methods Authors: Duque, Maria Rosa Editors: EGU Abstract: The knowledge of the temperature in depth and its lateral variations is very important. Its values can be obtained from the heat flow values measured at the surface of the globe, using thermal conductivity data and heat sources activeintheregion.Therearesomeregionswithdifferenttypesofheatsourcesbutthemainheatsourceconsidered is heat content associated to the decay of radioactive isotopes of Uranium (U) , Thorium (Th) and Potassium (K). It is not easy to obtain the concentrations of these elements especially if there are appreciable changes of their values in the regions on study. Our work is related with the information that can be obtained using data acquired from conventional methods and data obtained from a radiometric chart data. The study is made in two different geological regions in the Western part of the Iberian Peninsula.

2018-03-31T23:00:00Z Grandin, Raphaël Borges, José Fernando Bezzeghoud, Mourad Caldeira, Bento Carrilho, Fernando http://hdl.handle.net/10174/3673 2013-02-02T20:49:23Z 2007-01-01T00:00:00Z

Title: Simulations of strong ground motion in SW Iberia for the 1969 February 28 (Ms = 8.0) and the 1755 November 1 (M~ 8.5) earthquakes - II. Strong ground motion simulations Authors: Grandin, Raphaël; Borges, José Fernando; Bezzeghoud, Mourad; Caldeira, Bento; Carrilho, Fernando Abstract: This is the second paper of a series of two concerning strong ground motion in SW Iberia due to earthquakes originating from the adjacent Atlantic area. The aim of this paper is to use the velocity model that was proposed and validated in the companion paper for seismic intensity modelling of the 1969 (Ms = 8.0) and 1755 (M = 8.5–8.7) earthquakes. First, we propose a regression to convert simulated values of Peak Ground Velocity (PGV) into Modified Mercalli Intensity (MMI) in SW Iberia, and using this regression, we build synthetic isoseismal maps for a large (Ms = 8.0) earthquake that occurred in 1969. Based on information on the seismic source provided by various authors, we show that the velocity model effectively reproduces macroseismic observations in the whole region.We also confirm that seismic intensity distribution is very sensitive to a small number of source parameters: rupture directivity, fault strike and fault dimensions. Then, we extrapolate the method to the case of the great (M = 8.5–8.7) 1755 earthquake, for a series of hypotheses recently proposed by three authors about the location of the epicentral region. The model involving a subductionrelated rupture in the Gulf of C´adiz results in excessive ground motion in northern Morocco, suggesting that the source of the 1755 earthquake should be located further west. A rupture along thewestern coast of Portugal, compatible with an activation of the passivewestern Iberian margin, would imply a relatively low average slip, which, alone, would could not account for the large tsunami observed in the whole northern Atlantic ocean. A seismic source located below the Gorringe Bank seems the most likely since it is more efficient in reproducing the distribution of high intensities in SW Iberia due to the 1755 earthquake.

2007-01-01T00:00:00Z