Newsletter 9 - July 2022
URBASIS-EU latest publications
Analysis of the spatio-temporal evolution of the Maurienne swarm (French Alps) based on earthquake clustering
URBASIS-EU project - Work Package 2
Riccardo Minetto (ESR - UGA), Agnès Helmstetter (UGA), Stéphane Schwartz, Mickaël Langlais, Jérôme Nomade, Philippe Guéguen (UGA)
Earth and Space Science - 2022
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Combining recordings of earthquake ground-motion and ambient vibration analysis to estimate site response variability in the city of Lucerne, Switzerland
URBASIS-EU project - Work Package 3
Paulina Janusz (ESR - ETHZ), Donat Fäh (ETHZ), Vincent Perron (ETHZ), Wlater Imperatori (ETHZ),
Luis Fabian Bonilla (UGE), Christoph Knellwolf
Frontiers - 2022
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Read more URBASIS-EU publications
URBASIS-EU Spring School
In the framework of the European ITN project URBASIS-EU, we organized our first in-person scientific event, after more than 2 years of restrictions due to Covid. This spring school on seismic risk in urban environments was held from May 16 to May 21, 2022 in Autrans, in the French Alpine area.
The objective of this spring school was to provide students (PhD students, post-docs and others) with an overview of research issues in seismology and engineering seismology in a broad sense, as well as current and emerging research topics on seismic risk in interaction with the components that make up urban environments. But the objective was also to try to make up for the time lost by COVID by organizing a friendly, benevolent event and to create an atmosphere conducive to exchanges between junior researchers (PhD and post-doctoral) and senior researchers, beyond the only partners of the URBASIS-EU project that the online meetings had partly imposed.
This event was very dynamic, rich in question/answer sequences during the presentations, but also rich in discussion during the informal moments and the poster sessions. Collaborations between young researchers that had been anticipated online were confirmed in person, perspectives for the remaining months of the project appeared, and a new impetus was given to the project and its partners.
Time flies and by the end of the project (extended by 6 months) we have decided to encourage and recreate as much as possible this type of privileged scientific moment, especially at the end of the contract of young researchers in view of their future activity.
See you in May 2023 for the second URBASIS-EU spring school!
The objective of this spring school was to provide students (PhD students, post-docs and others) with an overview of research issues in seismology and engineering seismology in a broad sense, as well as current and emerging research topics on seismic risk in interaction with the components that make up urban environments. But the objective was also to try to make up for the time lost by COVID by organizing a friendly, benevolent event and to create an atmosphere conducive to exchanges between junior researchers (PhD and post-doctoral) and senior researchers, beyond the only partners of the URBASIS-EU project that the online meetings had partly imposed.
This event was very dynamic, rich in question/answer sequences during the presentations, but also rich in discussion during the informal moments and the poster sessions. Collaborations between young researchers that had been anticipated online were confirmed in person, perspectives for the remaining months of the project appeared, and a new impetus was given to the project and its partners.
Time flies and by the end of the project (extended by 6 months) we have decided to encourage and recreate as much as possible this type of privileged scientific moment, especially at the end of the contract of young researchers in view of their future activity.
See you in May 2023 for the second URBASIS-EU spring school!
Incoming URBASIS-EU scientific deliverables
Deliverable D4.2 - Time-variant probabilistic model for damage prediction in urban areas during induced seismicity cycle or aftershocks sequences
The generation of aftershocks sequences after the main event is a normal behavior in seismology, especially when the mainshock has a considerable magnitude and it could last for several days, weeks, months, and even years. This means that buildings are subjected to not only one main event that can cause structural damage but to a series of events that could trigger structural damage greater than traditionally considered since there could be accumulated structural damage resulting from loading and unloading cycles. In addition, over the years, and especially in seismically active regions, these accumulated damage processes can be so relevant that they cause the collapse of structures after events with not-so-large magnitudes. Therefore, this deliverable focuses on studying the accumulated damage in structures subjected to sequences of aftershocks and/or clusters of induced seismicity to include them in the estimation of the fragility curves and subsequently in the seismic risk assessment.
Iervolino et al. (2014). Degradation process for a mainshock-damaged structure exposed to aftershocks.
Trevlopoulos and Gueguen (2016). Fragility curves of the building models for the first fundamental period with thresholds of 20%, 40%, and 60%.
Deliverable D1.4 - Ground-Motion modelling as an Image processing task. Integration of new data and associated uncertainty reduction
To better understand the effect and influence of spatial density on ground motion predictions, we attempted to combine data from multiple seismic networks from the same region and compare intensity predictions with and without new seismological networks. The U-Net neural network architecture is used as a ground motion model that predicts the mean and standard deviation of a target intensity measure (IM, PGA) in the form of maps. The U-Net can interpolate the intensity measures between the observation points inherently and we here try to analyse the effect of spatial density in this interpolation by using multiple networks. Kanto basin in Japan is selected for this study due to the availability of dense seismic networks within the basin and we integrated the KIK-net and the MeSO-net networks within the basin for this study. The results show that the errors and the uncertainty levels between the predictions and the observations at the interpolated sites slightly decreased after adding an additional network for the training process, but the statistical significance is questionable. However, more networks or more observations per station are required to be integrated and trained within the same region to analyse and validate our results.
URBASIS-EU WP3 Workshop
URBASIS Work Package 3 organized a workshop on Thursday, June 30 in Trieste, Italy immediately after the GNGTS conference. This allowed PhD students to submit an abstract to the GNGTS conference. The URBASIS workshop was hosted by OGS. The purposes of this workshop was twofold: to provide opportunities for a discussion of parts of the PhD thesis before finalization, and to look into potential interaction between PhD projects in their final stage and for future activities.
The workshop was organized in three blocks. The first block was dedicated to research in WP3. The five PhD students of WP3 prepared a presentation focusing on open scientific questions for a discussion with the experts. The second block included presentations by each of the nine students who were present during the workshop. The presentations included a summary of the PhD research, the main scientific achievements and open scientific questions for the coming year. The third block included a discussion in three groups about potential interaction between PhD projects for future activities, and the presentations of the outcome.
The workshop was organized in three blocks. The first block was dedicated to research in WP3. The five PhD students of WP3 prepared a presentation focusing on open scientific questions for a discussion with the experts. The second block included presentations by each of the nine students who were present during the workshop. The presentations included a summary of the PhD research, the main scientific achievements and open scientific questions for the coming year. The third block included a discussion in three groups about potential interaction between PhD projects for future activities, and the presentations of the outcome.
