By Hawaiian Volcano Observatory Special to West Hawaii Today
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Mauna Loa erupted 46 years ago this week, on July 5 and 6, 1975, in a 20-hour event with vents confined to the summit region (the area above 12,000 feet) and lava flows descending to just below 10,400 feet. This was the first eruption in 25 years, at the time the longest quiet stretch since 1843 (we are currently in the longest stretch at 37 years and counting).

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