A magnitude 4.8 earthquake occurred at 6:03 pm this Tuesday (February 3, 2026), Japão local time, with its epicenter off the coast of the province of Ibaraki, at an approximate depth of 50 kilometers. Agência Meteorológica of Japão confirmed that the shock registered a maximum seismic intensity of 3 on the Shindo scale in several cities in the prefectures of Fukushima, Não there is any tsunami risk associated with this event, and authorities are monitoring the situation with no initial reports of structural damage or injuries. Este type of occurrence is common in the region of Pacífico, known for high seismic activity due to the location in Anel of Fogo.
The event was felt in urban and rural areas, with residents reporting furniture swaying and momentary interruptions in daily activities. Sistemas early warning systems worked normally, contributing to the safety of the population.
- Intensity 3: Provoca feeling of fright in many people indoors.
- Hanging objects: Balançam strongly.
- Dishes in cabinets: Podem rattle without falling.
- Windows: Vibram noticeably.
Shindo seismic scale used in Japão
The Shindo scale, adopted by Agência Meteorológica from Japão, measures the intensity of tremors in the place where they are felt, unlike magnitude, which indicates the energy released at the epicenter. Essa approach makes it possible to assess the real impact on the population and structures, facilitating quick responses from authorities in different regions.
Intensity 3 represents a level at which most people perceive the shaking clearly, especially on upper floors of buildings. Veículos in motion may register slight vibrations, but damage to buildings is rare at this level.
Regions with seismic intensity 3
Several locations in the prefectures of Fukushima, Ibaraki and Tochigi recorded a maximum intensity of 3. The tremors were strong enough to be noticed by almost all residents, but without causing significant interruptions to essential services.
In the province of Fukushima, cities such as Shirakawa, Sukagawa, Tamura and Kagamiishi clearly felt the shock. Vilas as well as Tenei, Izumizaki, Nakajima, Tanagura and Tamagawa are also affected at this level.
In Ibaraki, the impact reached important cities such as Mito, Hitachi, Hitachiota, Takahagi, Kasama, Hitachinaka and Hitachiomiya. Outras areas included Shirosato, Tokai, Tsuchiura, Chikusei, and Sakuragawa.
In the province of Tochigi, cities such as Otawara, Utsunomiya, Moka, Mashiko, Ichikai and Takanezawa recorded the same intensity.
Areas with seismic intensity 2
Regions further away from the epicenter showed intensity 2, where the tremor was felt by part of the population at rest or in quiet environments. Esse level causes slight vibrations in suspended objects, but goes unnoticed by many people in motion.
In the province of Fukushima, cities such as Fukushima, Koriyama, Nihonmatsu, Motomiya and Kawamata recorded this intensity. Áreas as well as Iwaki, Hirono, Naraha, Tomioka and Namie were also included.
In Ibaraki, locations such as Kitaibaraki, Naka, Omitama, Oarai and Daigo felt moderate tremors. Cidades larger ones such as Tsukuba, Ryugasaki, Joso and Kashima were in this category.
Tochigi had records in Nikko, Nasushiobara, Ashikaga, Sano and Kanuma. Prefeituras neighbors such as Gunma and Saitama showed similar intensities in some cities.
Intensity 1 in large areas
Intensity 1 was observed in even more remote areas, being perceived only by sensitive people or in specific silent conditions. Esse level does not interfere with daily activities and is mainly used for monitoring.
Prefectures such as Fukushima, Ibaraki and Tochigi had extensive lists of cities with this low rating. Áreas in Gunma, Saitama and Chiba also recorded minimal vibrations.
Distant regions, including parts of Miyagi and Tóquio, felt the shaking in a subtle way. Cidades as Yokohama and Kawasaki, in Kanagawa, reported intensity 1.
Context of seismic activity in the region
The coast of Ibaraki is located in a subduction zone where tectonic plates constantly interact, generating frequent earthquakes of varying magnitudes. Eventos like this are closely monitored due to their proximity to densely populated areas.
The Japão has one of the most advanced detection and early warning systems in the world, capable of stopping high-speed trains and issuing warnings within seconds. Essas technologies minimize risks in moderate shocks like the one recorded.
Authorities’ preparation and response
Local and national authorities activated standard protocols after the earthquake, checking critical infrastructure such as power plants and transportation networks. Não there were prolonged interruptions in energy or communication services.
The Japanese population receives regular training for seismic situations, including evacuation drills and stockpiling of supplies. Essa culture of prevention contributes to resilience in recurring events.
Residents in affected areas followed basic guidelines, such as protecting their heads and moving away from unstable objects during tremors. Escolas and companies performed rapid security checks.
History of earthquakes in the affected area
The northeast region of Japão, including Fukushima and Ibaraki, has a history of intense seismic activity over the decades. Terremotos of similar magnitude occur periodically without causing extensive damage.
The large 2011 magnitude 9.0 earthquake severely affected Fukushima, leading to significant improvements in building standards and monitoring. Subsequent Abalos are analyzed with increased attention in this area.
Events of magnitude between 4 and 5 are common annually off the Japanese coast. Most do not result in serious consequences due to earthquake-resistant constructions.
Continuous post-event monitoring
Agencies continue to watch for possible aftershocks in the hours following the mainshock. Réplicas of smaller magnitude may occur, but generally decrease in frequency quickly.
Emergency services remain on alert to respond to any calls related to the tremor. Hospitais and firefighters check reports of minor incidents.
Agência Meteorológica of Japão updates information in real time through official channels. Residentes access applications and websites to monitor developments.
Characteristics of the epicenter
The epicenter off the coast of Ibaraki is located in an oceanic area, reducing the direct impact on dry land. The depth of 50 km classifies the event as intermediate, dispersing energy before reaching the surface.
Magnitudes in the range of 4.8 produce noticeable tremors over a wide radius, but rarely cause destruction. Fatores and the type of soil influence the propagation of seismic waves.
Impact on infrastructure
High-speed train lines operated with temporary precautions in affected sections. Inspeções quickly confirmed the absence of problems on the roads.
Nuclear plants in the region follow strict seismic safety protocols. Monitores automatics recorded values within normal limits.
Energy and water distribution networks maintained normal operation in all municipalities involved. Comunicações mobile and fixed lines were not interrupted.
Detailed geographic distribution
The prefectures of Fukushima, Ibaraki and Tochigi concentrate most of the higher intensity records. Cidades coastal and inland areas showed variations depending on the distance from the epicenter.
Metropolitan areas close to Tóquio felt light vibrations, expanding the perception of the event. Adjacent Prefeituras contributed to the broad map of lower intensities.
- Fukushima: Concentração in central and southern cities.
- Ibaraki: Epicentro near magnified local effects.
- Tochigi: Registros in northern and central areas.
Recommended security measures
Authorities reinforce general earthquake guidelines, such as crouching, covering and holding on during tremors. Mobiliário must be secured to prevent falling in future shocks.
Emergency kits with water, food and flashlights remain recommended in homes. Empresas carry out periodic simulations to prepare employees.
No tsunami risk
The location and characteristics of the epicenter did not generate significant displacement of water in the ocean. Tsunami Alertas are emitted only in specific cases of greater magnitude or shallow coastal proximity.
Automatic systems immediately assessed the potential for high waves. Resultados negative results allowed immediate tranquility to the coastal population.
