LACSC 2026-Call for Abstracts for S-03 Session 03: Improving moment tensors and their uncertainty assessment

[Delia Iresine Bello Segura]

  We would be grateful if you could please forward the following invitation for LACSC. Thank you.  

Dear colleagues,

We are pleased to invite you to participate in Session 03: Improving moment tensors and their uncertainty assessment, to be held as part of the VI LACSC Assembly.  in Mexico City, Mexico (August 3-7, 2026). Abstract submission is available at https://lacsc2026.enesmorelia.unam.mx/ until March 13th. Please note there will be no deadline extensions. Please note that to submit an abstract, authors must first create a user account on the conference website. Once registered, they will be able to access the abstract submission system.

Session details:

The determination of earthquake location, seismic moment, and focal mechanism (strike/dip/rake angles) is now routine practice at seismological centers worldwide. However, the moment tensor (MT) representation of a seismic source is becoming increasingly important, since it also includes non-shear (non-double-couple, non-DC) source components, typically CLVD and ISO. CLVD components can arise, for example, from multi-type tectonic faulting, such as mixing of strike-slip and thrust episodes during complex earthquakes, or from seismic anisotropy. Non-DC components often characterize non-shear faulting events, e.g., earthquakes in volcanic and geothermal areas, or explosions. Since these parameters are less robust than strike, dip, rake, and moment, scientists and seismic agencies should report full moment tensors together with their uncertainties (confidence intervals). In light of these needs, this session welcomes contributions dedicated to recent methodological innovations in MT determination (including Bayesian framework, bootstrapping, covariance matrices, multiple-point-source models, MT variation across finite-extent sources, use of 3D Green's functions, etc.). Of great interest will also be MT routine calculations in seismic agencies and software automation. Furthermore, this session seeks practical applications where MTs shed light on tectonic processes and/or enable inferences about fluid effects in tectono-volcanic environments. Broader topics of interest also include the use of moment.

Conveners/Organizan

Conveener  Name (principal contact): Delia Iresine Bello Segura, de...@igeofisica.unam.mx, Instituto de Geofísica, UNAM, México

Juan Martín Gómez González, go...@geociencias.unam.mx, Instituto de Geociencias, UNAM, México

Silvina Valeria Nacif Suvire, nacif....@gmail.com, Instituto Geofísico Sismológico F. Volponi, Universidad Nacional de San Juan, Argentina

Efthimios Sokos,  eso...@upatras.gr, University of Patras, Greece.

Jiří Zahradník, jiri.za...@matfyz.cuni.cz, Charles University , Faculty of Mathematics and Physics, Prague, Czech Republic

Detalles de la sesión: 

La determinación de la localización de los sismos, el momento sísmico y los mecanismos focales
(ángulos de rumbo, buzamiento y deslizamiento) es actualmente una práctica rutinaria en los centros sismológicos de todo el mundo. 

A la luz de estas necesidades, esta sesión invita contribuciones dedicadas a innovaciones metodológicas recientes en la determinación del MT, incluyendo marcos bayesianos, técnicas de bootstrapping, matrices de covarianza, modelos de múltiples fuentes puntuales, variación del MT a lo largo de fuentes de extensión finita y el uso de funciones de Green en 3D, entre otros. Asimismo, serán de gran interés los estudios sobre el cálculo rutinario de tensores de momento en agencias sismológicas y la automatización de software.

Adicionalmente, esta sesión busca aplicaciones prácticas en las que los tensores de momento aporten información sobre procesos tectónicos y/o permitan inferir efectos de fluidos en ambientes tectónico-volcánicos. Otros temas de interés incluyen el uso del momento sísmico.

Should you have any questions, please do not hesitate to contact us.

Kind regards,

--

M. en C. Delia I. Bello Segura

Analista del Servicio Sismológico Nacional

Instituto de Geofísica, UNAM.

correos: de...@igeofisica.unam.mx

              ires...@ciencias.unam.mx

Tel. 5539564984