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Global earthquake detection and warning using Android phones.

Richard M Allen1,2, Alexei Barski1, Micah Berman1

  • 1Google LLC, Mountain View, CA, USA.

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Smartphone networks can detect earthquakes and deliver alerts globally. This system successfully identified numerous seismic events and provided timely warnings to millions, demonstrating a scalable solution for earthquake early warning.

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Area of Science:

  • Geophysics
  • Seismology
  • Computer Science

Background:

  • Earthquake early warning systems are crucial for mitigating seismic disaster losses.
  • Many earthquake-prone regions lack the necessary seismic networks for effective early warning.

Purpose of the Study:

  • To leverage the global Android smartphone network for earthquake detection and alert delivery.
  • To establish a user feedback framework for system improvement.

Main Methods:

  • Utilized the global network of Android smartphones to develop earthquake detection algorithms.
  • Implemented an alert delivery system reaching 98 countries for significant seismic events (M ≥4.5).
  • Collected user feedback on alert reception relative to perceived shaking.

Main Results:

  • Detected an average of 312 earthquakes per month in Türkiye (M 1.9 to M 7.8) over 3 years.
  • Delivered approximately 18 million alerts per month globally for M ≥4.5 earthquakes.
  • 85% of users reported feeling shaking, with alerts received before, during, or after shaking for 36%, 28%, and 23% of users, respectively.

Conclusions:

  • Smartphone-based earthquake detection algorithms can be effectively implemented at scale.
  • Post-event analysis of user feedback allows for continuous improvement of the system.
  • The global smartphone network offers a viable alternative for earthquake early warning in data-sparse regions.