Gravity changes as a precursor to volcanic eruption at Poás volcano, Costa Rica

@article{Rymer1989GravityCA,
  title={Gravity changes as a precursor to volcanic eruption at Po{\'a}s volcano, Costa Rica},
  author={Hazel Rymer and Geoff Brown},
  journal={Nature},
  year={1989},
  volume={342},
  pages={902-905}
}
MONITORING of gravity changes at active volcanoes has considerable potential for understanding magma-chamber dynamics and for detecting eruptive precursors. The technique essentially aims to identify changes in sub-surface mass or density corresponding to departures from the free-air gradient (FAG) or Bouguer-corrected (terrain-corrected) FAG (BCFAG), respectively1,2. Such gravity changes, of the order of 10–100 µgal, have been reported previously through eruptive periods3–6. Here we present a… CONTINUE READING

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