Kīlauea -Leilani 2018 lava flow delineation by using Sentinel2 and Landsat8 images

Kīlauea is a broad shield volcano built against the southeastern slope of Mauna Loa. The summit presently has a caldera that is roughly 4km by 3.2km wide, and walls of between 0 m and 120 m high. In late April 2018, an eruption interesting both the summit crater and the lower East Rift Zone (LERZ) occurred. In this work a quasi real time estimation of the evolution of radiant lava flow extension starting from May 2018 for Kīlauea -Leilani eruption using satellite image data is presented. The active lava flow evolution is obtained by using Copernicus Sentinel2 (S2) and USGS-Landsat8 (L8) polar satellites acquiring medium/high spatial resolution images (20mx20m and 30mx30m respectively) in the VIS-SWIR-TIR spectral range. Because of the Kīlauea eruption extension and duration, a multi sensor approach has been used in order to improve the timing of the information derived by high spatial resolution remote sensed data merging two missions with different revisit time. The 2018 eruptions at Hawaii's Kīlauea Volcano developed rapidly, after the initial activity centered on the Púu ′Ō′ō crater floor on 1 May followed by draining of the lava lake at Halemáumáu (HMM) Overlook Crater in the next days. During the magma extrusion from the summit, earthquake swarms and ground cracking hit the Leilani Estates neighborhood on 2 May. With the S2 and L8 sensors we followed the lava flow by 5th of May up to mid of August, considering also that the activity started to decline from the beginning of August. At the end of activity, Kīlauea Volcano experienced its largest LERZ eruption and caldera collapse in at least 200 years.