Eric Bilderback alerted park management that the crackmeter in the middle of Nāhuku had moved 1.96 mm Saturday night over the course of several hours, and had moved another 0.51 mm by Monday morning. On Sunday, National Park Service geomorphologist Dr. Further monitoring is required to determine if the lava tube can safely reopen. The slab measures about 2.16 x 3.23 meters (7.1 x 10.5 feet) and 20.3 cm (8 inches) thick. The narrowing movement could indicate the crack is adjusting in response to other fractures widening in the lava tube, making the large overhead chunk of rock unstable and potentially dangerous. NPS geomorphologists install a crack meter inside Nāhuku in November 2019Ĭontact: Jessica Ferracane, 80 HAWAII NATIONAL PARK, Hawaiʻi – Nāhuku lava tube in Hawaiʻi Volcanoes National Park is closed until further notice after data from a crackmeter revealed that a fracture near a large overhanging rock slab at the apex of the lava tube has narrowed by 2.47 mm since Saturday.
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