In the framework of the italian PRIN2020 Project “Fault segmentation and seismotectonics of active thrust systems: the Northern Apennines and Southern Alps laboratories for new Seismic Hazard Assessments in northern Italy” (NASA4SHA), the paleoseismology research group coordinated by Maria Eliana Poli (University of Udine), including geologists and paleoseismologists from the Istituto Nazionale di Geofisica e Vulcanologia (Emanuela Falcucci, Stefano Gori), University of Udine (Giovanni Paiero, Andrea Marchesini) and University of Ferrara (Giulia Patricelli, Riccardo Caputo), dug a trench across the eastern Southalpine front, investigating the Budoia-Aviano active thrust front.
Thanks to multiscale preliminary investigation, performed with geophysicists of the University of Ferrara (Enzo Rizzo), the paleoseismological study brought to light extraordinary recordings of past coseismic deformation associated to linear morphogenic earthquakes, in an area that since a few years ago was considered affected by minor seismicity. A set of reverse faults has been indeed exposed by the trench.
Now, other trenches will be made parallel to the first one; the challenge is to possibly associate this new paleoseismological evidence of coseismic surface displacement to historical seismic events of the region, thus contributing to more reliable estimates of the seismogenic and capability potential of the active faults of NE-Italy. In line with this, we are evaluating the possibility to make the site accessible for scientific and public awareness purposes.
A new coordinated project, composed by three subprojects led by fault2sha members of the Eastern Betics fautl2SHA-lab has been funded by the Spanish Ministry of Science and Innovation (PID2021-124155NB-C31).
Project Title: SHaKER, Seismic Hazard Knowledge for Earthquake Resilience
IPs: José A. Álvarez Gómez, José J. Martínez Díaz (UCM, subproject model_SHaKER), Carolina Canora (UAM, subproject paleo_SHaKER) and Alejandra Staller (UPM, subproject Geo_SHaKER)
The main objective of the SHaKER project is to advance in the knowledge of the seismogenic processes of seismic sources with the final objective of improving urban resilience to seismic disasters. To achieve this, we delve into the characterization of seismogenic source models with the integration and correlation of a number of disciplines in an interdisciplinar and multidisciplinar approach. To characterize the seismic sources we will use geological, geochemical, geotechnical, geodetic and geophysical data in addition to the development of numerical modelling and data analyses through machine-learning techniques. The numerical modelling will allow us to get insight into the complex, nonlinear, relations between the faults of the system, but also including external geological processes and tectonics in the long term evolution of fault systems.
These seismic source models are the basis for the development of new seismic and tsunami hazard and risk assessment studies, whose results will be essential to establish new proposals for improving urban resilience. The SHaKER project will help to estimate the faults seismic cycle and transient behaviours and characterize those seismogenic sources, including their kinematics and mechanical properties. These data will help us to quantitatively assess the sensitivity to uncertainties, thus contributing to reach the UN SDG11 in terms of the improved assessment of seismic risk, making the cities more inclusive, safe, resilient, and sustainable. In concordance with this aim we will develop also better assessments of earthquake triggered slope instabilities, earthquake surface ruptures and liquefaction.
We will continue the studies carried out in previous projects in two seismically active and densely populated zones, with different tectonic behaviours and transcurrent faults of special interest: the Eastern Betic Shear Zone (EBSZ) and the El Salvador Fault Zone (ESFZ). The EBSZ is one of the areas with the highest seismicity in the Iberian Peninsula where the largest populations (Lorca, Totana, Alhama de Murcia) are located directly above the fault traces. The need for a detailed study of the behaviour and geological history of these faults became evident after the 2011 Lorca earthquake, moderate magnitude event that caused important damage. The ESFZ is a system of strike-slip faults with significant seismic activity and a medium to high deformation rate, aligned within the volcanic arc, where a large part of the country’s population is concentrated. In this case, we will try to improve the knowledge of the ESFZ in the less studied areas, expanding our study to the Nicaraguan and Guatemalan volcanic arcs (including the Jalpatagua fault).
The SHaKER project will be backed by a multidisciplinary research team made up of geologists, geochemists, geophysicists, mathematicians, civil engineers and geomatics engineers. This guarantees the integration and correlation of diverse data sources, as well as the establishment of different approaches to assess the seismic hazard and its relationship and influence on the seismic risk and future urban planning. The results of the project will help to reinforce the resilience of cities in terms of seismic risk, generating products and tools that will be useful for public institutions and decision-makers, who work in emergency planning before de disaster.
The first two days of the 5th Fault2SHA Workshop have gone, with an exciting “long-lasting” participation (on average we had 90 connected via zoom for the whole time and 25 following the Youtube streaming – Fault2SHA 5th Workshop Playlist). We thank all the speakers and other participants; it is an impressive message of the needs of learning, sharing and growing of our communities. We remind you that there will be other possibilities, this difficult year, to get in touch with the WG Fault2SHA members and activities.
Day 3 of the workshop taking place at 14:30 (European Central Time) on Wednesday 2nd December will be an open discussion centred around the following themes:
(1) Palaeoseismic data- what information is needed and how should it be displayed to be easily and appropriately incorporated into seismic hazard models? How can we separate data from interpretation? (2) How to incorporate faults in seismic hazard assessment where we have low slip-rates and/or are lacking slip-rate data in the context of individual faults and whole regions. (3) Forming a new Fault2SHA lab – from data to models collaborating to incorporate fault data in seismic hazard assessment
We look forward to welcoming those of you who are joining us for the discussion then.
Dear “All Hands on Deck” workshop participants, we are ready to start this new experience. The programme is available online HERE, you can download it, for surfing on titles and abstracts on your own.
We have 227 registered participants: they received the link to follow the workshop via Zoom. In the first two days (Nov, 12-13) there will be 35 presentations, and one Keynote Lecture: presenters have their instruction to be online live. If you missed links or instruction, contact the organizers urgently.
If you missed the registration deadline, you still have the opportunity to follow the YouTube channel FAULT2SHA, live streaming HERE.
All Hands on Deck: Promoting Faults in Seismic Hazard Assessment
Free registration is open. Please fill in the registration form, in which we will ask a few short questions to help us know more about your interests. The registration deadline is Thursday 5th November 18:00 CET. Virtual Room is limited to 300 pre-registered participants. We will provide the link for the meeting for those who have registered after registration closes. Registration: https://forms.gle/JfC5o46NvNMa52gk9