During recent crises like COVID-19, microblogging platforms have become popular
channels for affected people seeking assistance such as medical supplies and rescue …

Large-scale natural disasters are a frequent occurrence in Japan. During and after such
disasters, numerous messages (ie, tweets) related to the disaster are posted on Twitter. For …

Disaster response procedures have been developed and improved following the Great East
Japan Earthquake. Innovative services have also been created through digital …

In Japan, when a large-scale natural disaster occurs, numerous messages (ie,“tweets”)
related to the disaster are posted on Twitter. Victims who need to be rescued use the …

Twitter has successfully been used as a critical information channel during natural disasters
since the 2011 Great East Japan Earthquake. However, enormous numbers of tweets are …

Self-and mutual-help by citizens are important as well as social-help from the local
governments, for disaster prevention and mitigation. Then, town watching and disaster …

In the aftermath of disastrous events in Japan, safety information and rescue requests, as
well as emergency alerts and damage situations, have been shared on Twitter. However …

During disasters, local governments use Twitter (X) to obtain information on damages and
rescue requests. However, due to the large volume of entertainment information posted on …

The utilization range of location information is expanding and it is expected that its
usefulness of application may similarly expand. In Japan, location information was utilized …

Using social media for information sharing during and after disasters has been gaining
attention. To facilitate information sharing during disasters, we developed a web system …