Lava activity is confined to Halemaʻumaʻu, with lava erupting from a vent on the northwest side of the crater and flowing into a growing lava lake. Laser rangefinder measurements this morning, indicate that the total depth of the lava lake is 223 m (732 ft). SO2 emission rates remain elevated; a measurement on March 19 was about 1100 t/day.

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