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Seismometers located across the island detect earthquakes and radio the electronic signals back to HVO. The arrival of the signals at HVO might seem...

Pu`u `O`o's crater

Pu`u `O`o crater and `a`a-pahoehoe

If a sinkhole collapses in your back yard, where and how did the stuff disappear? Did an underground opening already exist (such as a lava tube), did...

March 20 breakouts and Kuhio flow

March 25 marks the 20th anniversary of the most recent eruption of Mauna Loa. The eruption was preceded by roughly three years of increasing numbers...

Bright glow above flow field as seen from end of Chain of Craters Road

Distant lava flow viewed from Pu`u Huluhulu

Pu`u `O`o and pahoehoe

When we think of the negative impact that volcanoes have on people, the local geographic area of the eruption generally comes to mind. Ash, lava, and...