The image shows a screenshot taken October 19, 2020 11:30 pm UTC featuring earthquakes over the past 7 days, with the M7.5 earthquake showing up in blue and the other earthquakes colored by age, i.e. hour (red), day (orange) and week (yellow).
Such huge earthquakes can cause tsunamis.
In the Arctic, such huge earthquakes also come with the danger that they will destabilize methane hydrates at the seafloor which can cause huge amounts of methane to erupt. Shockwaves can travel along faults and cause eruptions at places far away from where the original eathquake occurred.
Ominously, methane levels as high as 2618 ppb were recorded by the MetOp-1 satellite on the morning of October 22, 2020 at 586 mb.
• USGS - Earthquakes map
• Seismic Events
• Climate Plan