Geodynamics 101

Modeling the full spectrum of observed seismicity: Insights from friction laws, fault instability, and fault-zone mechanics

Navid Kheirdast and edited by Alexis Gauthier June 17, 2026

Introduction Despite advances in our understanding of rock mechanics, the frictional behavior of rocks, and the physics of instability in geological materials, the coexistence of slow and fast earthquakes, as well as various types of fault-zone seismic radiation such as tremor, remains enigmatic. Can fault mechanics and friction laws reproduce the full spectrum of observed seismicity? In this week ...[Read More]

Fluid injection-induced seismicity: the case of hydrofracking

Dimitrios Papadomarkakis May 6, 2026

$Fluid injection-induced seismicity: the case of hydrofracking$

Seismicity is undoubtedly an integral part of Geodynamics, since seismic data, from large-scale geophysical monitoring, can provide many valuable insights regarding the state of the Earth’s crust; seismicity, however, is not always natural, it can also be induced. In this week’s blog, we explored the subject of fluid injection-induced seismicity mainly through the lens of hydraulic fracturing (HF; ...[Read More]

At the Mountains of Madness: Lovecraft Applied for Geology (and Failed)

Manel Ramos April 15, 2026

Howard Phillips Lovecraft © Wikimedia

“I am forced into speech because men of science have refused to follow my advice without knowing why. It is altogether against my will that I tell my reasons for opposing this contemplated invasion of the antarctic—with its vast fossil-hunt and its wholesale boring and melting of the ancient ice-cap —and I am the more reluctant because my warning may be in vain.” The opening lines from At the Moun ...[Read More]

Subduction interfaces are complicated – and that’s their beauty!

P. Io Ioannidi and edited by Nuno Rodrigues March 18, 2026

Summary schematic view of the subduction plate interface as inferred from the exhumed geologic record. From Behr and Bürgmann, 2021.

The dynamics of subduction zones are strongly influenced by the subduction interface. Understanding its rheology enables geodynamic modellers to better simulate these systems and unravel the fundamental processes that govern them. In today’s blog post, we explore subduction interface rheology and discuss effective approaches for modelling it. What is a subduction interface? I first met a subductio ...[Read More]