Geology Expert Warns Against Misinformation on Surabaya-Madura Fault

A video circulating on social media alleging the existence of an active fault in Surabaya-Madura, stretching from Kenjeran to Sumur Welut in Lakarsantri District, has caused a stir. However, it is clarified that the video was created by an educational content account and is not an official announcement from the Meteorology, Climatology, and Geophysics Agency (BMKG), nor does it represent a newly discovered fault. The Surabaya Fault and Waru Fault have been officially mapped in the Indonesian Earthquake Source and Hazard Map (PuSGeN) since 2017. Prof. Dr. Ir. Amien Widodo MSi, a geology expert from the Sepuluh Nopember Institute of Technology (ITS), urged the public not to easily believe information that is not supported by official and valid data. He stated, "If the person were well-intentioned, they would present the map, but it seems they drew it themselves. There should be a publication map from the Ministry of Energy and Mineral Resources. The image should look like this, so people can see it." Amien told detikJatim on Tuesday (8/9/2026). "This means they are not being fair, not presenting the original data. So, it's unfair. We ask, 'Is this true or not?' We checked with the Ministry of Energy and Mineral Resources, and the Geological Agency, but we couldn't find it," Amien continued. According to Amien, the active fault lines that have been recorded so far are only the Surabaya Fault and the Waru Fault. There is no official map showing the existence of a new active fault extending towards Madura. "But there's nothing that leads to Madura, right? Usually, it's the Surabaya Fault and the Waru Fault," he said. "That's what exists. Those two, the Surabaya Fault and the Waru Fault, usually pass through Surabaya," he added. Amien further explained that the ambiguity of the information becomes more apparent when the content uploader attaches a map of an irrelevant region, such as Malang, instead of providing official map evidence for Surabaya-Madura. "It's far away, with no connection. I read in the chat that many people are asking, but there's no such map. The original data should be displayed. So, there's a map of Surabaya, with a red line. Then, they might have added another line. That's like drawing their own line," he concluded. Source: Detik