Lessons learned from survey of Twitter users after March 11 Japan earthquake

Use of Twitter can benefit those seeking to broadcast or discover information in times of disaster, but a method for regulating false “retweets” might be needed.

A survey and questioning of Twitter users – plus tracking Twitter updates from people in disaster-stricken areas for two weeks after the March 11, 2011 earthquake and devastating tsunami in Japan – has provided information about how social media can benefit people involved in a disaster as well as those hoping to hear news.

The researchers – Adam Acar and Yuya Muraki of the Kobe City University of Foreign Studies – found that people in directly affected areas tended to tweet about their unsafe and uncertain situation, while people in remote areas posted messages to let their followers know that they are safe. Worryingly, they also found numerous unreliable “retweets” (RTs), where users of the service repeated inaccurate information, and that this was one of the biggest information-related problems facing those involved.

Image Credit: Daily Grit by Wes Thorp

Subjects in the study recommended that Twitter communication could be improved if official hashtags were announced during disasters and the number of retweets for a given hashtag could be limited to avoid the wider spread of disinformation.

The 9.0-scale earthquake that hit Japan on March 11 at 2:45 PM (local time) was the biggest quake in Japan’s history and the 5th biggest recorded across the globe. The subsequent tsunamis caused by the tremors caused additional devastation across three coastal prefectures, wiped two towns off the map, and claimed thousands of lives and displaced more than half a million people. At the time, members of the media reported that Twitter was the only functioning communication tool immediately after the earthquake.

Writing in the International Journal of Web Based Communities, the team explains how that recently there has been growing interest in the use of social media during disasters as a communications and news dissemination tool. The team wrote:

A wide range of studies suggest that information sharing networks, such as Twitter, can be very useful in times of crisis by quickly and effectively disseminating relevant news.

They pointed out, however, that there is often confusion among the public about the reliability of Twitter user updates after disasters such as the March 11 earthquake.

Page from Twitter on March 11, 2011 – the day of the Japan earthquake and tsunami. Image Credit: TechHamlet.com

Twitter is an instantly updated social media site. It can be accessed via the Internet, the mobile phone text messaging system (SMS), or any of a number of third-party tools used with smart phones or tablet and desktop computers. Once a user posts a message, that message (update) becomes public and can be viewed by anyone.

Estimates put the number of academic papers that have so far discussed Twitter at around 3000, and many of those studies point to the important role Twitter has played in quickly disseminating information about world events, such as Barack Obama’s presidential campaign, terrorism in Mumbai and other places, Iran street protests, events in the Middle East, the earthquake in Chile, flooding, forest fires, shooting incidents, and even the crash-landing of a passenger aircraft on the Hudson River in New York. As such, some researchers have suggested that Twitter is more than a communication tool and can function as real-time earthquake detection, election results forecasting, enterprise microblogging (as well as in word-of-mouth marketing, foreign language learning, celebrity watching and media profiling).

Adam Acar and Yuya Muraki found that Twitter posts in disaster-stricken areas and the areas that are indirectly affected were somewhat similar. Most of the tweets in disaster-hit areas were warnings, help requests, and reports about the environment. Official local authority Twitter accounts set up at the time of the earthquake were particularly useful, well followed and retweeted extensively, especially when warnings of an imminent tsunami were predicted. The team adds that updates asking desperately for help were “heart-breaking,” while other updates highlighted specific happenings such as the rise and fall of the sea, burning buildings and explosions.

However, the biggest problem was the reliability of Twitter updates, particularly in calls for help that were misplaced or lies.

Another problem they uncovered was the low signal-to-noise ratio for messages using hashtags. Hashtags are keywords prefixed with the # symbol that would normally allow users to filter updates of interest. Hashtag misuse led to difficulties in finding important messages in the areas that the earthquake hit directly. The researchers also found that although many users were concerned by the number of unfounded rumors, there were too few official updates from the government and the mass media.

If you search for Twitter via Google, this is what you’ll see.

Three major conclusions emerge from the study, according to Acar and Muraki:

  • All Twitter users during times of disaster should take more responsibility for their tweets.
  • Everyone should realize that Twitter is a public communication tool.
  • Information sources should be made clearer in updates.

They add that appropriate use of hashtags and a method for regulating inappropriate or false retweets might be implemented. Further research is now needed to assess whether or not announcing official hashtags during disasters would solve any of the problems seen during the recent tragic events in Japan.

Bottom line: A survey and questioning of Twitter users in disaster-stricken areas for two weeks after the March 11, 2011 Japan earthquake and tsunami – by Adam Acar and Yuya Muraki of the Kobe City University of Foreign Studies – suggests that people in directly affected areas tended to tweet about their unsafe and uncertain situation while people in remote areas posted messages to let their followers know that they are safe. Numerous unreliable “retweets” (RTs) were one of the biggest information-related problems facing those involved.

EarthSky