Masaya volcano (Nicaragua) - Smithsonian / USGS Weekly Volcanic Activity Report for 16 December-22 December 2015 (New Activity / Unrest)

INETER reported that rumbling and shock waves from small gas explosions at Masaya's Santiago Crater were reported during 15-17 December. Scientists conducting field work on 18 December observed that the crater hosting a lava lake had widened. Sounds from the volcano were louder and sulfur dioxide emissions had increased.
During 19-20 December spatter from the lava lake was ejected from the vent and landed a few meters away on the crater floor. RSAM levels were stable at low-to-moderate levels.

Source: Instituto Nicaragüense de Estudios Territoriales (INETER)
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From: Global Volcanism Program, 2015. Report on Masaya. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 16 December-22 December 2015. Smithsonian Institution and US Geological Survey.