Earthquake energy dissipation in a fracture mechanics framework

Area of Science:

• Earthquake physics
• Seismology
• Tectonophysics

Background:

• Earthquakes are fault ruptures generating seismic waves.
• Rupture speed and area, determining earthquake impact, depend on energy dissipation.
• Current understanding faces challenges in quantifying energy dissipation across scales.

Purpose of the Study:

• To outline challenges in defining and measuring earthquake energy dissipation.
• To emphasize the significance of distinguishing near-tip vs. far-behind-tip dissipation.
• To identify research gaps for a unified earthquake physics model.

Main Methods:

• Review of existing methodologies for energy dissipation measurement.
• Analysis of scale-dependent energy dissipation processes.
• Discussion of theoretical frameworks and their limitations.

Main Results:

• Significant challenges exist in consistently defining and measuring energy dissipation in earthquakes.
• The location of energy dissipation (near rupture tip vs. far behind) critically influences earthquake behavior.
• Existing models, primarily Linear Elastic Fracture Mechanics, are insufficient for a comprehensive understanding.

Conclusions:

• Accurate measurement and modeling of energy dissipation are crucial for earthquake hazard assessment.
• Further research is needed to develop consistent physical models that incorporate diverse dissipation mechanisms.
• Bridging the gap between laboratory and natural earthquake observations is essential for advancing earthquake science.