The eruptions intensified at about 7:00 p.m. on the same day. Three columns of flame rose and merged as the mountain became a flowing mass of liquid fire. Pieces of pumice of up to in diameter rained down at approximately 8 p.m., followed by ash at around 9-10 p.m. The eruption column collapsed, producing hot pyroclastic flows that cascaded down the mountain and towards the sea on all sides of the peninsula, wiping out the village of Tambora. Loud explosions were heard until the next evening, 11 April. The veil of ash spread as far as West Java and South Sulawesi, while a nitrous odor was noticeable in Batavia. The heavy tephra-tinged rain did not recede until 17 April. Analysis of various sites on Mount Tambora using ground-penetrating radar has revealed alternations of pumice and ash deposits covered by the pyroclastic surge and flow sediments that vary in thickness regionally.