Astute visitors to the U.S. Geological Survey Hawaiian Volcano Observatory (HVO) website may have noticed that some recent earthquakes have negative depths. This does not indicate a change in seismicity but, rather, an upgrade in HVO’s seismic data processing system.
A widely held belief is that Thomas Jaggar, founder of the Hawaiian Volcano Observatory, was able to stop a Mauna Loa lava flow in 1935. But is it true?
If you follow Kilauea Volcano’s ongoing East Rift Zone eruption, you are likely aware that when lava enters the ocean, it often forms new land. But what is this new land called?
Route 200, the Daniel K. Inouye Highway, crosses Humuula Saddle, which separates Mauna Kea and Mauna Loa, the two largest volcanoes on Hawaii Island. This Saddle showcases outstanding volcanic geology and is easy to reach for “roadside geologists.”
Careful readers of the USGS Hawaiian Volcano Observatory website might have noticed mention of “threat rankings” in the lower right corner of our new home page (https://volcanoes.usgs.gov/observatories/hvo/). There, you’ll find a listing of Hawaii’s active volcanoes — Kilauea, Mauna Loa,