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Keywords:

  • SSE triggering;
  • dispersion;
  • slow slip event;
  • tremor riggering;
  • tremors

Scientists recently observed that large earthquakes often trigger tremors in places far away, sometimes thousands of kilometers, from the epicenter. In a new study, researchers have now shown that a major earthquake in Chile in 2010 also could have triggered “slow slips”—events during which large parts of continents move undetected, without leaving any trail in seismograms. Zigone et al. show that the Maule earthquake in Chile (Mw 8.8) on 27 February 2010 generated surface waves (S waves) that within hours induced tremors in the Guerero region of Mexico. They also observed that GPS stations in the region started moving southward coincident with the arrival times of the S waves and the starting of the seismic tremors. The tremors and the southward movement of GPS stations continued for several months following the earthquake.