Sessions of interest at the 2019 IUGG

Please see below for sessions of interest to the GeoPRISMS Community, taking place at the 2019 IUGG General Assembly held at Montréal, Canada (July 8-18, 2019).

Abstract submission is open at

Abstract deadline is February 18, 2019

Please contact the GeoPRISMS Office at if you wish to advertise your sessions of interest on the GeoPRISMS Listserv.

JS03 – Subduction Zone Deformation and Structure, co-sponsored by IASPEI, IAG, and IAVCEI.
S20 – Earthquake Source Mechanics, sponsored by IASPEI.


JS03 – Subduction Zone Deformation and Structure

Subduction zones encompass a range of significant processes contributing to the long-term evolution of the Earth. Megathrust earthquakes along subduction margins define a major geohazard capable of catastrophic damages, as evidenced by the 2011 Japan and 2004 Indian Ocean earthquakes, that are stark reminders of what is likely in store for Cascadia. However, our understanding of subduction zone processes and ultimately characterization of geohazards is hampered by a lack of observations, in particular offshore. For Cascadia, this data gap lies directly above the seismogenic zone and its downdip transition to slow earthquake phenomena, where material properties evolve due to hydro-mechanical variations and metamorphic reactions. In recent years, improvements to permanent monitoring networks and dense temporary deployments have focused on a 4D characterization of stress, strength and fluid pressure evolution in subduction zones. In this session we invite contributions from a broad range of disciplines that address first-order questions about how megathrusts work, based on onshore/offshore surveys and integration of observation and modeling approaches for global subduction zones.

Conveners: Yajing Liu (McGill, IASPEI), Michael Bostock (UBC, IASPEI), Kelin Wang (GSC, IASPEI), Lucinda Leonard (UVic, IAG), Simon Peacock (UBC, IAVCEI)

Best wishes,

Yajing Liu
Associate Professor
Department of Earth and Planetary Sciences
McGill University
Montreal, Canada

S20 – Earthquake Source Mechanics

Recent high-quality seismic and geodetic observations provide large volumes of data, which enable accurate determination of earthquake source parameters, including locations, magnitudes, moment tensors, and detailed imaging of coseismic rupture processes. Further, techniques for solving inverse problems have improved substantially in the recent past. Abundant information from these analyses is the basis for studying a variety of earthquakes including swarms, tectonic and volcanic events as well as induced events, and to seek the governing laws and conditions for rupture initiation, growth and arrest. It also provides useful input to estimate the stress state, fault geometry, and fluid movement around seismic regions. The entire earthquake process from long-term tectonic loading and slow nucleation to rapid rupture propagation with strong motion radiation is now studied using numerical simulations. The validity of assumptions in these simulations is tested by data analysis and laboratory experiments supported by several drilling projects. In this symposium, we invite contributions on data analysis and interpretation of earthquake parameters and source processes, on improvement and validation of routine analysis techniques, on theoretical and numerical modeling of dynamic ruptures and earthquake sequences, and observational and experimental studies on the physics of earthquakes. In addition, studies of significant earthquakes including recent events such as the 2016 Kumamoto, Japan (Mw 7.0), Central Italy (Mw 6.2), and 2017 Mexico (Mw 8.1 & 7.1) earthquakes are welcome.

Conveners: Satoshi Ide, Naofumi Aso, Simone Cesca, Daniela Kühn, Yajing Liu, Seok Goo Song

Best regards,

Satoshi Ide (