# Seismic activity in Indonesia and Japan > Live situation record from CLSTR: https://clstr.news/situations/seismic-activity-in-indonesia-and-japan > Updated: 2026-08-24T03:01:00.000Z. Sources: 343. Developments: 4. Seismic activity has intensified across the Pacific Ring of Fire, affecting both Indonesia and Japan. In Indonesia, a 6.1 magnitude earthquake struck off the coast of western Sumatra at a depth of 29 kilometers. This event follows a devastating 7.7 magnitude earthquake near Flores that caused at least 68 deaths. While tsunami warnings for the Sumatra event were later lifted, authorities continue to manage debris clearance and power outages that have hampered rescue efforts in the wake of the Flores disaster. In Japan, two significant earthquakes occurred within a 24-hour period on August 23, 2026. The first, a preliminary magnitude 5.9 tremor, was centered in southern Ibaraki Prefecture at a depth of 70 kilometers. The quake was felt strongly across the Kanto region, including Tokyo, Saitama, Chiba, and Kanagawa, reaching a seismic intensity of 5-lower. At least 37 people were reported injured, mostly from falls or colliding with furniture; notably, an elderly woman in Yokohama sustained a serious hip injury, and two individuals were injured in Kawasaki city. Infrastructure impacts included a ruptured water pipe in Tokyo’s Koto district causing temporary flooding and power outages for approximately 460 homes. While express trains to Narita Airport faced delays, Shinkansen bullet trains operated normally. Hours later, a second earthquake with a preliminary magnitude 6.0 struck off the coast of Urakawa in Hokkaido at a depth of 40 kilometers, though no immediate injuries were reported from this second tremor. The Japan Meteorological Agency confirmed no tsunami risk for either Japanese earthquake, and nuclear facilities, including Tokai and Fukushima, reported no abnormalities. Prime Minister Sanae Takaichi has established a crisis management office to coordinate damage assessment, and authorities have advised residents to remain vigilant for aftershocks. ## Claims - At least 37 people were injured in the earthquake. (disputed by 36 sources) - At least five people were injured across Ibaraki, Chiba, and Saitama prefectures. (disputed by 4 sources) - Injuries were distributed across Tokyo (15), Saitama (9), Kanagawa (8), Chiba (4), and Ibaraki (1). (disputed) - The earthquake's epicenter was located south of Ibaraki Prefecture at a depth of approximately 70 kilometers. (corroborated by 50 sources) - No tsunami warning was issued following the earthquake. (corroborated by 50 sources) - The earthquake had a preliminary magnitude of 5.9. (corroborated by 50 sources) - Prime Minister Sanae Takaichi announced the formation of a government task force to assess damage. (corroborated by 28 sources) - No abnormalities were detected at the nuclear power plants in the affected region. (corroborated by 24 sources) - A water pipe burst in the Koto district of Tokyo, causing flooding on a street. (corroborated by 19 sources) - There is no threat of a tsunami resulting from this earthquake. (corroborated by 18 sources) - Approximately 460 homes in Tokyo experienced temporary power outages. (corroborated by 12 sources) ## Timeline ### 2026-08-24: Japan hit by two significant earthquakes in 24 hours Two significant earthquakes, magnitudes 5.9 and 6.0, struck Japan within 24 hours, injuring at least 37 people in the eastern region and causing tremors in Hokkaido. No tsunami risk was reported. 6 sources. https://clstr.news/cluster/japan-hit-by-series-of-earthquakes-including-60-magnitude-tremor ### 2026-08-24: Japan earthquake: 5.9 magnitude tremor hits Tokyo and Kanto region A 5.9 magnitude earthquake struck Tokyo and the Kanto region of Japan, injuring at least 37 people. No tsunami was triggered, and nuclear plants reported no abnormalities following the tremor. 12 sources. https://clstr.news/cluster/japan-earthquake-59-magnitude-tremor-hits-kanto-region ### 2026-08-22: Japan earthquake strikes Kanto region, injuring at least 37 people A magnitude 5.9 earthquake struck eastern Japan near Ibaraki, injuring at least 37 people and causing minor damage in Tokyo and the Kanto region. No tsunami threat or nuclear abnormalities were reported. 326 sources. https://clstr.news/cluster/earthquake-of-magnitude-59-strikes-eastern-japan ### 2026-08-18: Sumatra, Indonesia hit by 6.1 magnitude earthquake A 6.1 magnitude earthquake struck western Sumatra, Indonesia, amid ongoing seismic activity and recent fatal earthquakes near Flores in the Pacific Ring of Fire. 2 sources. https://clstr.news/cluster/sumatra-indonesia-hit-by-61-magnitude-earthquake --- Cite as: Seismic activity in Indonesia and Japan. CLSTR, https://clstr.news/situations/seismic-activity-in-indonesia-and-japan