Heatstroke Risk Complicates Kumamoto Earthquake Recovery

A powerful earthquake that struck Kumamoto Prefecture on 28 July, measuring a maximum intensity of 7, has left many residents without electricity or running water just as Japan endures a prolonged heatwave. With temperatures remaining dangerously high, health authorities worry that heatstroke could become a secondary disaster, particularly for those staying in damaged homes or crowded evacuation centers.

The dual threat is acute because the quake disrupted infrastructure at the height of summer. Air conditioning, often the first line of defense against heatstroke, is unavailable in many areas. Public health experts are now emphasizing alternative cooling strategies to protect vulnerable populations—especially the elderly and young children—who face heightened risks from extreme heat.

Expert Advice on Staying Cool When Infrastructure Fails

Why Heatstroke Is a Critical Concern After Earthquakes

Strenuous recovery work, damaged buildings that trap heat, and the loss of cooling systems turn a natural disaster into a prolonged health emergency. The human body struggles to regulate temperature when ambient heat is high and hydration is insufficient. Without rapid cooling, heatstroke can lead to organ failure or death, making immediate prevention essential in the disaster zone.

What Dr. Miya's Guidance Tells Us About Resourcefulness

In an interview, Dr. Yasufumi Miyake, head of the Heatstroke Research Institute, stressed that the right response depends on which utilities still function. If a car has fuel, its air conditioning can provide temporary relief—but users must avoid sitting still for too long to prevent economy-class syndrome. Even turbid tap water or leftover bathwater can be used to cool the skin with wet towels, and simple hand immersion in ice water can lower core temperature efficiently. The doctor’s most urgent message: the elderly and infirm should not remain in unairconditioned spaces; moving to relatives’ homes, hotels, or public cooling centers in areas where power is intact can be a lifesaver.

Practical Steps to Prevent Heatstroke After the Quake

  • If you have electricity and air conditioning: use it without hesitation, but if it fails, try to move to a location with working cooling.
  • When power is out but water works: cool the body with damp towels and fanning, or take cool baths if possible. Even murky water or bathwater is safe for external cooling.
  • If you have a car and gasoline: use the vehicle’s air conditioner to cool down, but park in the shade and move your legs and drink fluids every few hours to reduce the risk of blood clots.
  • Watch for heatstroke signs: confusion, slurred speech, or unresponsiveness demand an immediate ambulance call. While waiting, move the person to shade and apply ice packs to the neck, armpits, and groin—or immerse hands in ice water.
  • Never force a disoriented person to drink: they may choke; let them sip if able. If symptoms persist after hydration, seek medical treatment.