STEP'UP PhD Congress 2025

Session

Shaping the Earth: Faults, Quakes, and Erosion

CDD-03

22 mai 2025, 13:30

IPGP

136. Keynote 04: From paleoseismology to space geodesy, can we still discover a new tectonic plate? Example along the Dead sea fault.

Yann Klinger (IPGP)

22/05/2025 13:30

Talk

83. From thermal pressurization to dilatant strengthening during stick-slip ruptures on saturated saw-cut thermally cracked westerly granite

M. Caiyuan FAN (École Normale Supérieure, Paris)

22/05/2025 14:15

Experimentation

Talk

Earthquakes result from the transient frictional weakening of faults during co-seismic slip. Dry faults weaken due to the degradation of fault asperities by frictional heating (e.g. flash heating). In the presence of fluids, theoretical models predict faults to weaken by thermal pressurization of pore fluid. Despite theoretical predictions, not only numerical models seldom consider the...

93. Synthetic earthquakes in a 3D numerical sandbox

Adélaïde Allemand (IPGP)

22/05/2025 14:30

Simulation

Talk

This study presents a numerical sandbox experiment in which earthquakes occur. The experiment models a strike-slip fault by enforcing translation motions to the bottom and lateral boundaries of a virtual, rectangular box. The approach used is the Discrete Element Method (DEM), where rock is modelled as a set of spherical, rigid particles interacting with one another.

The geometry of the...

118. Slip rates and deep lithospheric deformation along a fault ruptured during the 2012 Mw 8.6 Wharton Basin earthquake

Saksham Rohilla (IPGP)

22/05/2025 14:45

Geophysics

Talk

The traditional understanding of plate tectonics posits rigid plates primarily undergoing deformation at narrow plate boundaries. However, the equatorial Indian Ocean presents a unique scenario with a diffused deformation zone spanning ~3000 km within the Indo-Australian plate. Past investigations have identified N-S compression in the Central Indian Ocean basin and strike-slip motion along...

104. Interactions between fault geometry, crustal damage and slip before, during and after the 2023 Kahramanmaraş earthquakes (Turkey)

Paul Dérand (ENS)

22/05/2025 16:30

Geophysics

Talk

Large continental strike-slip earthquakes usually present a complex rupture trace composed of several segments separated by discontinuities. Fault geometry may interact with stress concentration and rupture propagation and have an influence on the distribution of coseismic slip and the termination of ruptures. However, other factors can influence slip distribution and rupture propagation, such...

120. An enhanced earthquake catalog of the 2010 Mw 8.8 Maule aftershock sequence using modern tools

Rodrigo Flores Allende (IPGP)

22/05/2025 16:45

Geophysics

Talk

Understanding rupture mechanisms, seismicity propagation, distribution, and migration after a major earthquake relies on the quality of earthquake catalogs, particularly their detection capabilities, location accuracy, and magnitude completeness. On February 27, 2010, a Mw 8.8 earthquake struck the Maule region in south-central Chile, causing widespread damage and substantial loss of life. As...

91. Characterisation of the soil properties along railway tracks using Distributed Acoustic Sensing

Joseph Grand (IPGP)

22/05/2025 17:00

Geophysics

Talk

A precise understanding of the soil profile is important for railway operations, impacting not only vibration and noise propagation but also broader aspects such as train speed adjustments and infrastructure resilience. Soil properties influence track stability, and changes due to climate variations—such as extreme rainfall or drought—can affect safety and performance. Monitoring these...

108. Spatial assessment of erosive processes in a badland catchment using diachronic LiDAR, Draix, Alpes de Haute-Provence, France

Yassine Boukhari (Institut de Physique du Globe de Paris)

22/05/2025 17:15

Remote Sensing

Talk

Badlands have been extensively studied for their erosion dynamics and sediment transport due to their remarkable sensitivity to climate forcing [1]. These erosion processes, primarily driven by mass wasting, are typically investigated at the plot scale using rainfall experiments [2] or at the catchment scale by integrating export measurements at gauging stations [1]. However, detailed spatial...