Significant Earthquakes Shake Indonesia: Sumbawa and Aceh Hit

In early October 2026, Indonesia experienced a series of significant earthquakes, prompting alerts from the Meteorology, Climatology, and Geophysical Agency (BMKG). On the morning of October 4, the most powerful of these was a magnitude 6.1 quake that struck near Sumbawa at 5:55 AM, with its epicenter located 14 kilometers southwest of Kodi, Sumba Barat Daya at a depth of 10 kilometers. BMKG confirmed that this event did not pose a tsunami threat, but residents were advised to remain cautious of potential aftershocks.

According to CNBC Indonesia, the tremors from the 6.1 magnitude quake were felt strongly for approximately one minute across three regions: Sumba Barat Daya, Sumba Barat, and Manggarai Barat. Berton SP Panjaitan, the acting head of the Disaster Data, Information, and Communication Center at BNPB, reported that while the quake was felt intensely, the situation remained stable with no immediate panic or significant damage reported at that time.

BMKG advised residents to be cautious of possible aftershocks following the earthquake.

Shortly after, at 6:37 AM, a 5.9 magnitude earthquake was recorded in the Calang-Aceh Jaya region, situated 68 kilometers southwest of Calang. Similar to the earlier quake, this event was also deemed safe from tsunami risks, according to BMKG.

In addition to these larger quakes, smaller tremors were reported in other regions. On October 1, a magnitude 4.7 earthquake occurred in Banggai Kepulauan, Central Sulawesi, which residents described as mild. The quake's depth was also recorded at 10 kilometers, and BMKG reassured the public that it posed no tsunami threat.

Following the 6.1 magnitude quake, reports indicated that 20 houses and several public facilities in Sumba were damaged, with one person sustaining minor injuries from falling debris. The damage assessment revealed that 19 houses were lightly damaged and one sustained moderate damage, affecting areas such as Desa Waikadada, Weerena, Bondo Kodi, and Homba Karipit. This contrasted with earlier reports that indicated no significant structural damage.

According to Iyan Bailia, a resident of Banggai Kepulauan, the tremors were not too strong and he did not leave his house during the event.

BMKG has been monitoring seismic activity closely, especially in light of Indonesia's position on the Pacific Ring of Fire, which makes it one of the most seismically active regions in the world. The agency continues to emphasize the importance of public awareness regarding earthquake preparedness, particularly in coastal areas where tsunami risks are a concern.

Indonesian coverage has notably stressed the immediate impact of the earthquake on local infrastructure and community safety. While BMKG and local authorities focused on the absence of tsunami threats and urged calm, reports from CNBC Indonesia highlighted the tangible effects on housing and public facilities, underscoring the need for ongoing monitoring and community support. This divergence illustrates how the media in Indonesia balances immediate safety concerns with broader public reassurance.