Lumajang, E Java, July 17 -- Mount Semeru in East Java erupted again on Wednesday, shooting up columns of volcanic ash that reached a height of 800 meters above the summit.

"Mount Semeru erupted at 5:19 p.m. Western Indonesia Time (WIB), with an around 800-meter volcanic ash column above its summit," an observation officer at Mount Semeru, Yadi Yuliandi, confirmed in a written report.

According to Yuliandi, the ash column was thick, grayish in color, and drifted westward. The eruption was recorded by a seismograph with a maximum amplitude of 22 mm and lasted 140 seconds.

He noted that the volcano had also erupted earlier that day at 6:13 a.m. local time, although no visual data was recorded. That eruption lasted 118 seconds and was rec...