On September 6th, 2020 we should have met in Corfu (Greece), at the 37th General Assembly of the European Seismological Commission. It was an important appointment for all of us who have committed ourselves to this adventure of the Working Group Fault2SHA, because the first four years of mandate, entrusted to us in the spirit of international voluntary collaborations, expire in 2020, and a renewal till 2024 has been asked for.
But a small pile of proteins has decided otherwise, and the world is adapting to new rules and new rhythms.
These are the reasons why we announce the 5th Workshop to be held online, a “liquid” workshop open to everyone.
A first Pre-Announcement has been sent to the Working Group Member list. Stay tuned on our Event List, on our Social Media, or subscribe the working Group, if you want to be updated by email messages.
About 24 hours to go, before the very first experiment of a FAULT2SHA CHAT SESSION, at #shareEGU20. It’s an unique opportunity to share at distance new ideas and original results, within this community, now open to the participation of the many of us that would have not attended the #EGU20 meeting anyway.
If you want to be part of the chat session, please follow these steps:
1) check in advance if you can enter into a chat – you need a Copernicus account –
3) Scroll the slide shows/posters and take note of the questions you want eventually to deliver to the authors in a separate document, to be ready to copy&paste it into the chat, when the presentation will be raised for discussion
4) You can add comments/questions to each presentation also after the end of the session. All the material will be available till end of May.
As you know the physical EGU General Assembly 2020 in Vienna is cancelled for the COVID-19 emergency. EGU has therefore decided to host EGU2020: Sharing Geoscience Online (#shareEGU20), a week-long series of online activities held during the first week of May that support our community by fostering scientific communication.
Please have a look on our EGU2020: Sharing Geoscience Online page which is frequently updated. Please follow this website and the Fault2SHA EGU’s social media Twitter accounts (@Fault2SHA @EuroGeosciences) using the official hashtags #Fault2SHA, #EGU20 and #shareEGU20 for more information.
We are full of sorrow for the loss of Patience Cowie. Patience was a good friend for some of us, a great colleague for many and, we are sure, an inspiring person for all who crossed her path. We will miss her greatly. Thanks to her open-minded approach to science she was able to bring innovation in all the research she did and will undoubtedly be remembered as a great researcher by the earth science community at large. She focused in the most recent years on active tectonics, with the main aim of integrating field observation, theory and numerical modelling. For many years she focused her studies in the Central Apennines in Italy, setting the building stones of what is today one of the FAULT2SHA natural laboratories. Patience was indeed among the promoters of the FAULT2SHA working group. Thank to Patience’s efforts and passion she really helped in promoting the first Fault2SHA meeting in Paris back in 2014. She was convinced that an interaction between geologists and modellers was the best way to go to improve our understanding of earthquake phenomena and mitigate seismic risk. Of course, she was right. We are grateful for her enthusiasm, we will continue thanks to her seminal ideas on fault interaction, episodic fault activity, fault propagation and fault linkage. She was a mentor for most of us and we will miss her profound insight and intuition.
ProjectTitle : OLLIN–Identification (and characterization) of seismogenic faults in populated areas of Latin America and its incorporation into seismic hazard assessment
PI : María Ortuño Candela – Universitat de Barcelona
OLLIN is a project aiming to set up a new collaborative framework between specialists and young researchers from both sides of the Atlantic to improve geological knowledge and seismic hazard assessment (SHA) of two populated regions of Latin America. These are the Transmexican Volcanic belt (TMVB) and the Northern Southamerica Plate Boundary (NSAPB), which extends from Ecuador to Colombia and Venezuela. To do so, three fundamental steps are undertaken; Firstly, data on the seismogenic potential of faults in these areas is gathered, discussed and selected. The most likely fault rupturing mechanisms are discussed, which will lead us to focus the fieldwork on areas which are relevant to SHA but lack information on key seismic parameters (slip rates, segmentation, complex versus simple ruptures, maximum expected earthquakes, etc.). Secondly, the incorporation of that knowledge on seismogenic fault models into the SHA is conducted using existing Fault2SHA tools. This step includes the adaptation of those tools to these specific Latin American settings and the generation of new ones. Finally, results dissemination to society is ensured by the participation of stakeholders from civil protection, geological surveys and other end-users through special meetings, training courses and on-line access that allow to keep track of progress and results.
Understanding how successive earthquakes accrue on faults to produce tectonic landforms is still poorly understood. The way deformation is accommodated throughout the crust, in response to the far-field plate tectonics force imposes at plate boundaries, strongly affects the seismic cycle and may control earthquake triggering and the spatial pattern of fault ruptures. The Apennines range, host of the 2016 seismic sequence (5 shocks Mw5-6.5 over 9 months), is a unique area where the accumulation and release of slip over multiple seismic cycles, over time scales of 1yr-1 Myr and spatial scales of 1m-100km, can be determined. We will combine frontier methodologies in geochronology, remote sensing, geodesy, geophysics, high-resolution topographical data acquisition, seismic hazard modelling, all developed and/or mastered by our teams, to quantitatively constrain how portions of the seismic cycle scale up over multiple cycles to produce the cumulative escarpments we see in the landscape.
In the last months two papers concerning earthquake interactions and probabilistic seismic hazard of the WFZ were published by members of the FAULT2SHA Working Group (Verdecchia et al., 2019, GJI; Valentini et al., 2020, BSSA).
Verdecchia and coauthors used an approach based on physical (coseismic + postseismic Coulomb stress changes) and statistical (probability calculations) to determine if the stress changes due to the youngest paleoevents have significantly modified the present-day probability of occurrence of large earthquakes on each of the segments of the central WFZ. The authors show that regardless of any uncertainties in this approach, Coulomb stress changes strongly affect the time-dependent probability of a large earthquake on the Brigham City, Salt Lake City, and Provo segments. These results indicate that the seismic hazard connected with single-segment ruptures on the central WFZ might be underestimated, if the effects of stress changes are not considered.
Valentini and coauthors assess the impact that the Wasatch fault segmentation model has on seismic hazard by evaluating the time-independent long-term rate of ruptures on the fault that satisfy fault-slip rates and paleoseismic event rates, adapting standard inverse theory used in the Uniform California Earthquake Rupture Forecast (Vers. 3) and implementing a segmentation constraint in which ruptures across primary structural complexities are penalized.