JAKARTA, Oct. 1 (Xinhua) -- Mount Kelud in Indonesia's East Java province, which is currently in an alert status for possible eruption, produced at least two tremors on Monday, a volcanologist said.

    The first tremor occurred in the wee hours of Monday and lasted 70 seconds. The second tremor happened at 06:00 a.m. local time and lasted 120 seconds, head of the Mt. Kelud Emergency Unit Umar Rosadi said.

    The volcanic tremors indicated that Mount Kelud's volcanic activity had intensified significantly, he said.

    "For the time being, we are focusing our attention on the tremors because if they occur continuously, they might trigger an eruption," he was quoted by the national Antara news agency as saying.

    On Saturday, two tremors shook the active volcano, prompting authorities to raise alert status in the areas surrounding the 1,731-meter mountain.

    Mt. Kelud last erupted on Feb. 10, 1990. Located on the border between Kediri and Blitar districts in East Java, Mt Kelud's activity has been increasing over the last few weeks.