Identification of seismogenic faults in populated areas of Latin America and its incorporation into seismic hazard assessment

What is OLLIN?

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 three populated regions of Latin America. These are the.Transmexican Volcanic belt (TMVB), the Northern Southamerica Plate Boundary (NSAPB), which extends from Ecuador to Colombia and Venezuela, and Central and South regions of the Andes. To do so, three fundamental steps are undertaken; Firstly, data on the seismogenic potential of faults in these areas are 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.

The project was proposed (see proposers descriptions below) in October 2019 and recognized by UNESCO-IUGS  in March 2020. Due to the COVID, the project funding is expected to start in January 2022. We have undertaken the first steps to define the collaborators network that now is structured in three regions coordinated by regional representatives. These are: TMVB-Mexico (Coord. P. Lacan, UNAM); NSAPB-Ecuador-Colombia-Venezuela (Coord. M.C.López, Servicio Geológico Colombiano, L. Audin, IS-Terre France) and Central-South Andes (Coord: S. Moreiras, CONICET-Argentina and C. Benavente IGMyM, Perú). In Europe, participants are coordinated by M. Ortuño (Univ. Barcelona) and J. García Mayordomo (IGME-Spain).

See below our first activities. We are planning to have the first field trip of the network during the  VIII Quaternary and Geomorphology Argentinean Congress (San Juan, september 2022), an onlineIGCP project meeting  during 2022 and a summer school in Colombia (2022/23).

Proposers & Participants

Maria Ortuño - Main proposer

More info: https://webgrec.ub.edu/webpages/000009/ang/maria.ortuno.ub.edu.html

Orcid: https://orcid.org/0000-0001-9365-6997

Twitter: https://twitter.com/MaraOrtuo14

María Ortuño is researcher and professor at the University of Barcelona (research group RISKNAT). The main topics of her research are geological hazards and landscape evolution, with special emphasis on paleoseismology, tectonic geomorphology and slow gravitational movements. In the last year, she has also had an eye in the integration of geological data into seismic hazard analysis, and is part of the Ex. Com of the Fault2SHA ESC-working group. Maria has been involved in several projects devoted to improving the seismic hazard definition in Iberia, such as the QAFI data-base, the SHAKE and PREVENT projects or the Spain-SSHAC (for the Nuclear Regulatory Commission). Her fieldwork experience was mainly conducted in Spain (Pyrenees and Eastern Betics) and Mexico. Part of her contributions have to do with outreach initiatives, as the book “La Tierra, un planeta inquieto” (“The Earth, a restless planet”, ed. Univ. Barcelona) or “Tierra de temblores” a short-documentary on earthquake geology, accessible here.

Julián García Mayordomo - Secretario

More info: https://tectact.wordpress.com/personal-websites/julian-garcia-mayordomo/

Orcid: https://orcid.org/0000-0001-9203-271X

Twitter: https://twitter.com/GarciaMayordomo

Julián García-Mayordomo holds a permanent position as a Scientist (Científico Titular) at the Geological Survey of Spain (Instituto Geológico y Minero de España, IGME). His research activity is centred in Seismic Hazard Analysis, covering both scientific aspects as well as engineering applications. Its most relevant achievements are in relation to the transfer of geological data into seismogenic source characterization for Probabilistic Seismic Hazard Analysis (PSHA). He is the scientific manager of the Quaternary active faults (QAFI) and seismogenic zones (ZESIS) databases of Iberia. He is a regular advisor for national institutions as Spanish Civil Protection (e.g., for the Earthquake Emergency Plan of Murcia Region) and the National Seismic Network (e.g., for the update of the National Seismic Hazard Map), and he has also acted as a consultant for large corporations as Iberdrola I&C (e.g., technical integrator in the SSHAC Level-3 for the Spanish nuclear power plants). He held a position of Associate Lecturer in Complutense University (2014-2017) teaching Seismic Hazard. He is co-author of 26 JCR publications, and has co-directed 2 doctoral theses, while other two are in progress.

Germán A. Prieto

More info: https://www.gaprieto.com/

Orcid: https://orcid.org/0000-0001-8538-7379

Twitter: https://twitter.com/GPrietocruz

is an Associate Professor at the Departamento de Geociencias Universidad Nacional de Colombia. His research spans the study of the physics of earthquakes, tectonics and seismicity within subduction zones, the prediction of ground motions within sedimentary basins and the response of engineering structures to these ground motions.

Franck A. Auderman M.

More info: https://www.researchgate.net/profile/Franck-Audemard

Orcid: https://orcid.org/0000-0003-2046-5916

Twitter: https://twitter.com/DrSeawater

Venezuelan (Universidad Central de Venezuela, Caracas) geo-scientist since 1985, with an MSc and PhD from Université de Montpellier II (USTL, Montpellier, France, 1993), fond of active faults and earthquake effects in any tectonic setting. Audemard has dedicated his entire professional career to better characterize the seismogenic potential of Quaternary faults via Earthquake Geology, to better characterize the Seismic Hazard of vital and essential infrastructure as well as of the citizen’s dwellings; and has worked particularly along the southern Caribbean Plate Boundary Zone and on the North Andes Block escape tectonics, as well as in active fold-thrust belts of Venezuela, Colombia and Argentina. Principal tools applied through the over 35-year-long experience are: aerial photo interpretation, field mapping, neotectonics, microtectonics, geomechanics, structural geology, tectonics, seismics, paleoseismology (either fault, liquefaction or tsunami trenching), historical seismology, seismotectonics, geodynamics and geodesy. Career dedicated to research, teaching and consulting. Retired from Venezuelan Foundation for Seismological Research –FUNVISIS- since January 01st, 2020 and now in search of new horizons and challenges!!!

Laura Peruzza

More info: https://www.inogs.it/en/users/laura-peruzza

Orcid: https://orcid.org/0000-0001-7781-5775

Scopus ID: https://www.scopus.com/authid/detail.uri?authorId=6603388024

Twitter: https://twitter.com/LaurenceAudin

Laura is a senior researcher at the Istituto Nazionale di Oceanografia e di Geofisica Sperimentale – OGS in Trieste, Italy. Her research activities focus on seismology and seismic hazard, in active continental regions and volcanic areas. Also, she was involved in science communication programs, and she’s been promoter of initiatives for seismic risk awareness and reduction (Edurisk project, Sisifo-MIUR project).

She has been project Leader and participant in national research projects (Eg. the ones funded by the National Civil Defense Department, DPC). In particular, she promoted with O. Scotti (IRSN, France) the formalization of the Fault2SHA Working Group (www.fault2sha.net) within the European Seismological Commission focused on the optimization of fault data in seismic hazard assessment, which counts now more than 220 members all over the world. Laura has been member in national consulting commissions (Commissione Grandi Rischi- Seismic from 2002 to 2005) and other international working groups dealing with seismic hazard (e.g. the Working Group on Hazard Model Integration of Global Earthquake Model, 2010-12). She participated to past international analyses promoted by Unesco (ADRIA-GSHAP), projects of scientific exchanges on funds of the Ministero degli Esteri (Greece), Agenzia Italiana per la Cooperazione allo sviluppo (Central America), ICTP (Cuba). Finally, she is involved in projects on seismic hazard evaluation at the local/regional scale for special plants (e.g. dams), and monitoring activities for potentially induced earthquakes.

She is author of more than 70 papers on international and national peer reviewed journals and books, and many other publications on conference proceedings, with about 150 oral presentations or posters. Laura is editor of special issues on seismic hazard (e.g. for Journal of Seismology, Bulletin of Earthquake Engineering, and Natural Hazards and Earth System Sciences), and booklets and multimedia (CD-DVD-Rom) for education purposes.

Laurence Audin

More info: https://www.isterre.fr/annuaire/pages-web-du-personnel/laurence-audin/

Orcid: https://orcid.org/0000-0002-4510-479X

Twitter: https://twitter.com/LaurenceAudin

I am a senior researcher at IRD-ISTerre in UGA, research group “Cycle sismique”. The main topics of my research are Seismotectonics, Seismic Hazards and Quaternary landscape evolution, with special emphasis on paleoseismology, archeoseismicity, tectonic geomorphology and quaternary dating in the Andes. As part of the GEM SARA project, I worked on the integration of seismotectonic data into seismic hazard analysis. I’m part of the International Laboratory SVAN for the Ecuador and Peru -working groups, as well as of several research projects devoted to seismic hazard definition in the Andes, such as the ANR REMAKE, AURA RESHIST and PATA Cusco projects. Or the French FACT-RESIF initiative (on le Teil 2019 earthquake among others). Her fieldwork experience was mainly conducted in Chile, Peru and Ecuador (in the Andes), Mexico and Ethiopia. Outreach: Montagnes et Sciences film festival. More: ISTerre LA’s web page

Pierre Lacan

More info: https://www.researchgate.net/profile/Pierre-Lacan

Orcid: https://orcid.org/0000-0001-9077-8390

Twitter: https://twitter.com/PLacanNeotec

is a full researcher in Earth sciences at the Geosciences Center of UNAM in Queretaro, Mexico. His research interest focuses on the identification and characterization of active faults and seismic hazard. He uses quantitative geomorphology and paleoseismology as tools for characterizing the seismotectonic potential of active faults and related seismic hazards. He’s working in various seismotectonic regions of the world, with different deformation rates, from slow (France, Spain, Argentina) to moderate or fast (Peru, Mexico), giving him the opportunity to develop extensive experience in the characterization of active faults to extract meaningful information useful for seismic hazard studies.


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  • V Fault2SHA meeting online (2020) with a invited talk focused on the project and communications of some of our project members. Program and link to youtube sessions available at http://fault2sha.net/5th-workshop/

  • Ortuño, M., Julián García-Mayordomo, Pierre Lacan, Laurence Audin Franck Audemard, Germán Prieto, Laura Peruzza, Ramón Zúñiga, Carlos Benavente, Stella Moreiras, Myriam C. López, Mónica Arcila, OLLIN network (2021). The OLLIN 669-IGCP project: Active faults for Seismic Hazard Assessment in Latin American countries. Young Ambassadors “The Earth Project”, IGCP project talks and infographics workshop 22.07.2021

  •  Audin, L., Ortuño, M., Lacan, P., García-Mayordomo, J., Audemard, F., Prieto, G., Peruzza, L., Zúñiga, R., Benavente, C., Moreiras, S., López, M.C., Arcila, M., and all the OLLIN network membres. The OLLIN 669-IGCP project: First steps of a Fault2SHA approach in Latin American countries, Earth Science Meeting of France T18.8 PIGC session, https://rst2020-lyon.sciencesconf.org/

  • Special Session at the Annual mmeting of the Unión Geofísica Mexicana (31st october-5th november 2021, Guadalajara, Mexico). SE04 OLLIN-IGCP669 Central Mexico: Amenaza sísmica en el Cinturón Volcánico Transmexicano: Avances en neotectónica, paleosismología, sismicidad histórica e instrumental (conveners: Lacan, P., León, R., Ortuño, M., Suárez, G.) https://www.raugm.org.mx/



Related to FAULT2SHA MODELS and to INPUT DATA-shorted by regions (geological, geodetical and seismological characterization of seismic sources)




Alcacer Sanchez, J., Tejada, F., Rothis, M., Perucca, L., Haro, F., Miranda, S. (2020). El método potencial (gravimetría) como herramienta en el análisis morfotectónico del valle de Iglesia, provincia de San Juan. Revista de la Asociación Geológica Argentina, 77:...


Arzate J., Lacan P., Corbo-Camargo F., Arango-Galván C., Maldonado R.F., Pacheco J., León Loya R. (2018) Deep structure of the eastern Acambay Graben (Central Mexico) from integrated geophysical data, Revista Mexicana de Ciencias Geológicas, 35-3, 228-239.  ...


SHERIFS User guide and tutorials

SHERIFS. The open-source python code SHERIFS (Seismic Hazard and Earthquake Rate In Fault Systems, Chartier et al, 2019, Seismol. Res. Lett) allows the user to build hazard models including earthquake ruptures involving several faults (or Fault-to-Fault FtF ruptures) while exploring epistemic uncertainties.

Thomas Chartier

FAULT2SHA web page

The FAULT2SHA Working Group has been formally approved by the European Seismological Commission at the 35th General Assembly, held in Trieste, Sept 2016.
Participation in the FAULT2SHA Working Group is on a voluntary basis.The aim of the ESC FAULT2SHA working group is to motivate exchanges between field geologists, fault modelers and seismic hazard practitioners.

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