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Parallel dynamics of slow slips and fluid-induced seismic swarms
Philippe Danré1, Louis De Barros2, Frédéric Cappa2
1Université Côte d'Azur, CNRS, Observatoire de la Côte d'Azur, IRD, Géoazur, Sophia Antipolis, Valbonne, France. philippe.danre@geoazur.unice.fr.
Nature Communications
|October 16, 2024
Summary
Earthquake swarms are driven by fluids or slow slip. Analyzing migrating earthquake sequences reveals distinct scaling laws, helping differentiate between fluid-induced and slow-slip-driven seismic activity.
Area of Science:
- * Seismology
- * Tectonophysics
- * Fluid dynamics in geological systems
Background:
- * Earthquake swarms are sequences of seismic events often lacking a clear mainshock.
- * Hypocenter migration is a common feature in swarms, potentially indicating underlying physical processes.
- * Distinguishing between fluid-induced and aseismic slip as swarm drivers is crucial for hazard assessment.
Purpose of the Study:
- * To analyze global data of migrating earthquake sequences.
- * To identify and compare scaling laws for migration velocity, moment, and duration.
- * To differentiate between fluid-induced and slow-slip-driven earthquake swarms.
Main Methods:
- * Compilation and analysis of global datasets of migrating earthquake sequences.
- * Statistical analysis of hypocenter migration patterns.
- * Identification of scaling relationships between migration velocity, seismic moment, and event duration.
Main Results:
- * Two distinct behavioral patterns were identified in migrating sequences.
- * Fluid-induced swarms exhibit lower migration velocities and moments compared to slow-slip events.
- * Scaling laws differ significantly between fluid-driven and slow-slip-driven seismic sequences.
Conclusions:
- * The study provides metrics to distinguish the driving mechanisms of earthquake swarms.
- * Identified scaling laws offer insights into the physics of fault slip transients.
- * Findings prompt a reevaluation of established scaling laws, particularly for swarm seismicity.
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