Lumajang, East Java, Sept. 19 -- The tremor from a lava flood from Mount Semeru in Lumajang District, East Java, was recorded for over 2.5 hours on Thursday night (September 18), following heavy rain at the peak of the highest mountain on Java Island.

"Based on observations of Semeru's seismic activity, one flood tremor was recorded with an amplitude of 10 mm and a duration of 9,132 seconds, or more than 2.5 hours," Mount Semeru Observation Post Officer Yadi Yuliandi said in a statement on Friday.

During the same period, Mount Semeru's seismic activity was still dominated by 55 eruption earthquakes, with amplitudes of 10-22 mm and durations of 47-226 seconds.

"We also recorded seven avalanche earthquakes with amplitudes of 3-6 mm and d...