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Researchers directly measured seismic rupture slip rates during the 2025 Mandalay earthquake using CCTV footage. The study reveals a pulse-like rupture with peak slip velocities of ~3.5 m/s.

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Area of Science:

  • * Seismology
  • * Earthquake rupture dynamics

Background:

  • * Understanding coseismic rupture processes is crucial for seismic hazard assessment.
  • * Direct measurements of slip-rate functions during large earthquakes are rare.

Purpose of the Study:

  • * To directly measure the slip-rate function of a natural coseismic rupture.
  • * To characterize the mechanical properties of seismic rupture using elastodynamic models.

Main Methods:

  • * Analysis of high-resolution video footage from a CCTV camera near the surface rupture.
  • * Direct image analysis to quantify slip over time and deduce slip rate.
  • * Application of slip-pulse elastodynamic rupture models.

Main Results:

  • * Measured a local slip duration of 1.4 seconds for the 2025 Mandalay earthquake.
  • * Determined a cumulative slip of approximately 3 meters.
  • * Observed peak surface slip velocities reaching ~3.5 meters per second.
  • * Demonstrated the pulse-like nature of the seismic rupture at the recording site.

Conclusions:

  • * The study provides the first direct measurement of a slip-rate function from a natural earthquake rupture.
  • * Findings confirm the pulse-like characteristics of seismic rupture propagation.
  • * Elastodynamic modeling allowed for the determination of complete mechanical properties of the slip pulse.