Tidal variations in the volcanic earthquake swarm offshore Mayotte in 2019
Abstract
An ocean-bottom seismometer network deployed around the 2018-2019 Mayotte seismic swarm from March-May 2019 recorded more than 17000 events in 66 days (about one event every 5 minutes). The event rate has a strong semidiurnal component, as has been observed at other seafloor volcanic systems, and the extremely high event rate and a collocated absolute pressure gauge allow a detailed analysis of the correlation between earthquakes and both ocean and earth tides. We investigate the correlation between the earthquake rate, tidal stresses and seafloor currents to understand the effect of tides on volcanism during the Mayotte seismic swarm and we investigate the possibility of tide-generated seafloor currents generating a false earthquake-tidal correlation. We also investigate the correlation between tides and VLF events that may be directly correlated with magma movements.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.V43I0228C
- Keywords:
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- 8499 General or miscellaneous;
- VOLCANOLOGY