A magnitude 5.6 earthquake struck Yamanashi Prefecture on the evening of June 26, 2026, registering a maximum seismic intensity of 6-lower (6弱) in Fujikawaguchiko Town. The tremor, which occurred at approximately 10:28 PM local time, had its epicenter in the Eastern Yamanashi/Fuji Five Lakes region at a depth of about 20 kilometers. According to the Japan Meteorological Agency (JMA), no tsunami warning was issued. For foreign residents living in or near the affected areas, understanding the immediate aftermath and ongoing risks is crucial. The earthquake caused power outages affecting approximately 2,860 households across Yamanashi, Saitama, and Ibaraki prefectures, according to Chief Cabinet Secretary Kihara's press conference held shortly after midnight. Additionally, partial water service disruptions were reported in Yamanakako Village, though gas services remained largely unaffected. The most critical information for residents is the JMA's warning that aftershocks of similar intensity could occur within the next week. The meteorological agency specifically cautioned that earthquakes reaching seismic intensity 6-lower remain possible for approximately one week following the initial tremor. This level of shaking can cause unsecured furniture to fall, make it difficult to remain standing, and potentially damage older buildings. Residents in Fujikawaguchiko described the initial shaking as a sharp vertical jolt followed by several seconds of lateral movement, according to reports from local government officials collected by NHK. While the Fuji Five Lakes Fire Department reported no immediate damage as of 10:35 PM, experts warn that the real danger may come from secondary effects. Professor Sakai Shinichi from the University of Tokyo's Earthquake Research Institute, speaking to NHK, noted that the region has experienced frequent seismic activity historically, and this earthquake represents a somewhat larger event in that pattern. More concerning for residents is his warning about rainfall-related risks. With rain forecasted for the region, the combination of ground destabilization from the earthquake and precipitation significantly increases the risk of landslides and cliff collapses. For foreign residents concerned about Mount Fuji, experts have provided reassurance. Professor Fujii Toshitsugu from the Yamanashi Prefectural Mount Fuji Research Institute explained that the earthquake's epicenter—located between Otsuki City and Doshi Village at approximately 20 kilometers depth—corresponds to an area where the Philippine Sea Plate is subducting, a common location for seismic activity. Importantly, the JMA confirmed that no unusual changes have been detected in Mount Fuji's volcanic monitoring data following the earthquake. However, residents should be wary of misinformation. NHK reported that social media platforms saw a surge of unfounded posts linking the earthquake to potential Mount Fuji eruptions and predicting larger earthquakes in specific areas. Officials urge residents to rely only on information from official sources such as the JMA, local government announcements, and established news organizations. Prime Minister Takaichi addressed the nation, confirming that the government immediately established a crisis management office at the Prime Minister's Official Residence and convened bureau-level officials from relevant ministries to coordinate response efforts. The government's priority remains assessing damage and conducting any necessary rescue operations. For the expatriate community, this earthquake serves as an important reminder to review emergency preparedness plans. Ensure your emergency kit is stocked, secure heavy furniture and objects, identify evacuation routes, and register with your embassy. Keep your mobile phone charged and enable emergency alerts in Japanese. Understanding the seismic intensity scale used in Japan—where intensity 6-lower represents strong but not catastrophic shaking—helps contextualize official warnings and appropriate responses. A follow-up tremor registering seismic intensity 3 occurred at 11:17 PM the same evening, reinforcing the JMA's warnings about continued seismic activity. Residents should remain vigilant, particularly during the one-week elevated risk period, and exercise extra caution during rainfall when landslide risks increase.