USGS Hawaiian Volcano Observatory geologists visited the western rim of Halemaʻumaʻu crater for a closer look at the active ...

Kilauea's eruption continues with lava flows and tephra covering a closed road. Geologists are studying tephra samples to learn about the magma storage before the eruption. Select whether each of ...

The Kulanaokuaiki Tephra is part of the Uekahuna Ash ... of the units and is commonly found resting on the Kipukanene lava flow field (350-190 BCE). It is made up of small 0.2-0.4 inch (0.5-1 ...

So, although each flow is considered a single event ... accompanying ash clouds and don't usually leave steaming tephra deposits (see video above) because the mixing with meteoric water keeps ...

Any tephra larger than ash but smaller than bombs ... and sometimes both can happen at different points in the same flow, says Krippner. Pāhoehoe forms when the lava is hot and fluid, creating ...