Tectonic Processes and Earthquake Dynamics

Earth’s lithosphere is partitioned into tectonic plates whose relative movements generate stress accumulation along plate boundaries and faults. Interactions ranging from subduction and continental collision to strike-slip motion govern the distribution of seismicity and the style of crustal deformation. Stress is stored intermittently over centuries to millennia, then released abruptly in earthquakes, producing complex rupture propagation, ground displacement and changes in stress on neighbouring faults. Advances in geodetic monitoring, seismic waveform analysis and numerical modelling have illuminated the processes of fault nucleation, rupture acceleration and aftershock triggering. These insights underpin hazard assessment and inform engineering design in vulnerable regions worldwide. Integration of gravity field studies, deep seismic imaging and laboratory experiments is refining our understanding of fluid-rock interactions, mechanical decoupling of crustal layers and the feedbacks between long-term tectonic loading and transient seismic phenomena.

Research from Nature Portfolio

Recent studies have revealed that deep mass transfer, possibly driven by fluid diffusion, can precede major earthquakes by years. Hybrid gravity observations around a blind thrust fault showed a subtle increase in gravitational anomaly up to two years before a magnitude-7 event, followed by post-seismic density reduction. Bayesian inversion of spatiotemporal gravity data and disc-shaped source modelling highlighted the role of deep crustal fluids in stress redistribution. Complementing this, deep seismic reflection profiles across an eastern margin of a high plateau have uncovered mechanical decoupling between upper and lower crust, delineated by an inherited fault zone. This decoupling model demonstrates that crustal-scale shortening concentrates strain at different levels, driving uplift and focusing seismicity along reactivated boundaries.

Tectonic Processes and Earthquake Dynamics publication trend

The graph below shows the total number of articles in tectonic processes and earthquake dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Blind thrust fault: A thrust fault that does not break the surface but releases strain at depth.

Coseismic deformation: Surface and near-surface displacement occurring during an earthquake rupture.

Interferometric Synthetic Aperture Radar (InSAR): A remote-sensing technique that measures ground displacement by comparing radar images over time.

Coulomb stress change: Variation in shear and normal stress on a fault induced by neighbouring seismic events, affecting fault stability.

Fault coupling: Degree to which tectonic plates or fault segments are locked or slipping aseismically, inferred from geodetic measurements.

Seismic moment: A measure of earthquake size that reflects the fault area, slip amount and rock rigidity.

References

1. Gravity field changes reveal deep mass transfer before and after the 2013 Lushan earthquake. Communications Earth & Environment (2023).
2. Outlining tectonic inheritance and construction of the Min Shan region, eastern Tibet, using crustal geometry. Scientific Reports (2017).
3. GPS-Derived Fault Coupling of the Longmenshan Fault Associated with the 2008 Mw Wenchuan 7.9 Earthquake and Its Tectonic Implications. Remote Sensing (2018).
4. Rupture processes and Coulomb stress changes of the 2017 Mw 6.5 Jiuzhaigou and 2013 Mw 6.6 Lushan earthquakes. Earth, Planets and Space (2019).
5. Kinematic fault slip evolution source models of the 2008 M7.9 Wenchuan earthquake in China from SAR interferometry, GPS and teleseismic analysis and implications for Longmen Shan tectonics. Geophysical Journal International (2013).