Author Archives: tada

About tada

Dr. Nakasu is a post-doctoral fellow and an adjunct lecturer at College of Population Studies, Chulalongkorn University in Thailand. He had been working at NIED (National Research Institute for Earth Science and Disaster Prevention) as a principal research fellow and ICHARM (International Centre for Water Hazard and Risk Management), PWRI (Public Works Research Institute) as a research specialist in Japan for a decade. He has conducted many disaster field surveys such as Indian Ocean Tsunami (2004), Hurricane Katrina (2005), Typhoon Ondoy and Pepeng (2009), Great East Japan Earthquake and Tsunami (2011), and Chao Phraya River Flood (2011). He also conducted abundant disaster management research around the globe. He had been a project leader of the Working Group of Hydrology, the Typhoon Committee (WMO and UN/ESCAP) for nearly 3 years. He was also a visiting researcher at JICA (Japan International Cooperation Agency) and an adjunct instructor at several universities in Japan. He won a second prize for his poster presentation at the Society for Risk Analysis-Asia Conference in Taipei in 2014. He is a tsunami evacuation research committee member of the Japanese Association for Earthquake Engineering (JAEE). His research interests include the environment and comparative studies. 日本語版: 中須正

Imagine from Disaster Damage StatisticsReading Between the Numbers: What Disaster Damage Statistics Really Tell UsImagine from Disaster Damage Statistics

The following is the revised version of my past short essay for the institution’s mail magazine:

There is an index called the World Risk Index. According to the World Risk Report, Bangladesh ranked among the highest-risk countries in the world in 2019. Indonesia and Haiti also came to mind readily, their names long associated with devastating earthquakes in recent memory.

During a study session at my institution, I had the opportunity to examine Bangladesh’s disaster history from a land environment perspective — particularly the catastrophic cyclones of 1970 and 1991. The reported death tolls were staggering: approximately 500,000 and 140,000 lives lost, respectively. The sheer scale of these figures was striking, but what caught my attention was something subtler — why were these numbers so rounded?

When I looked more closely at the damage breakdown table, something immediately stood out. For the 1991 cyclone, the data recorded 1,630,543 houses damaged, 140,000 people dead or missing, and 584,471 livestock lost. House damage and livestock figures were precise to the single digit. Human casualties, by contrast, were a rough estimate.

That contrast is telling. It reflects not a statistical coincidence, but something deeper about how societies count — and what they choose, or are able, to count. Understanding Bangladesh’s social fabric — its caste structures, religious communities, and the central role of livestock in rural livelihoods — helps explain why certain losses were carefully documented while others remained approximate. Livestock, after all, represent measurable economic assets. Human lives in crisis, particularly among the most marginalized, are far harder to account for.

This gap becomes even more apparent when we look at 1970: no reliable death toll exists. Estimates from various sources range from 200,000 to 550,000 — a spread of 350,000 lives.

When a disaster strikes, damage figures circulate quickly. But I have come to believe that one of the most important analytical habits we can develop is to ask: Where do these numbers come from? What do they capture — and what do they leave out? The story behind the statistics is often as revealing as the statistics themselves.

By the way, the website is
https://reliefweb.int/sites/reliefweb.int/files/resources/WorldRiskReport-2019_Online_english.pdf
Issued July 5, 2010 No. 6

Source: 

1. NIED-DIL mail magazine: 6
Imagine from disaster damage statistics
Contribution day and time: 2013/08/19

2. Day_167: Imagine from Disaster Damage Statistics, Disaster Research Notes

【The 2011 Chao Phraya River Floods Case Study Content: Nikkei BizRuptors (website)】

Balancing Continuity and Survival: Lessons for Overseas Manufacturers from Thailand’s 2001 Flood

【Updated : Disaster Links Library launched (website)】

Disaster Link Library

【Project launched (website)】Disaster Risk Management in Aging Societies: Bridging Japanese Experience with Thai Policy Needs

Disaster Risk Management in Aging Societies

【Disaster Research: Infograph】AI-Integrated Disaster Preparedness Platforms (Open Access Examples)

The infographic of the AI-Integrated Disaster Preparedness Platforms is shown as an infographic: AI-Integrated Disaster Preparedness Platforms

【Disaster Research: Infograph】1985 mexico city earthquake

The infographic of the 1985 Mexico City Earthquake, mainly focusing on the social factors with earthquake characteristics, is shown as an infographic: http://disasters.weblike.jp/mexico%20infogr.html

The distance impact reminded me of the situation in Bangkok when an earthquake occurred in Myanmar in April 2025.

【Disaster Research: Infograph】The 2004 Tsunami in Thailand

This infographic was presented at RIHN in Japan as part of the Prof. Ito project, as part of the Feasibility Study. The infographic website is: https://disasters.weblike.jp/IOT%20v2.html

The presented numbers should be confirmed. Especially, the foreigner’s death toll and the Thai national death toll, with their proportion, are under reinvestigation.