The top panel shows the number of measurable earthquakes that occurred on a daily basis beneath Mauna Loa for the month of November. Prior to Nov. 27, 2022, an aver-age of 40 earthquakes a day occurred. The day of the eruption, more than 160 earth-quakes occurred. The bottom panel shows the minute changes in elevation as record-ed by tiltmeters on Moku’āweoweo Caldera. There are negligible changes until the time of eruption, showing that magma quickly came into the summit region at that point. Credit: USGS.

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The top panel shows the number of measurable earthquakes that occurred on a daily basis beneath Mauna Loa for the month of November. Prior to Nov. 27, 2022, an aver-age of 40 earthquakes a day occurred. The day of the eruption, more than 160 earth-quakes occurred. The bottom panel shows the minute changes in elevation as record-ed by tiltmeters on Moku’āweoweo Caldera. There are negligible changes until the time of eruption, showing that magma quickly came into the summit region at that point. Credit: USGS.

The top panel shows the number of measurable earthquakes that occurred on a daily basis beneath Mauna Loa for the month of November. Prior to Nov. 27, 2022, an aver-age of 40 earthquakes a day occurred. The day of the eruption, more than 160 earth-quakes occurred. The bottom panel shows the minute changes in elevation as record-ed by tiltmeters on Moku’āweoweo Caldera. There are negligible changes until the time of eruption, showing that magma quickly came into the summit region at that point. Credit: USGS.

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