TREMR

It was still dark in Kobe at 5:46 on the morning of January 17, 1995. The city of 1.5 million people had not yet begun its day. Office workers, students, elderly residents in their futons — the Hanshin Expressway overhead, a symbol of Japan's postwar rebuild, stood as it had stood for three decades. Sixteen seconds later, 635 metres of it had fallen.

The M6.9 earthquake — known in Japan as the Great Hanshin-Awaji Earthquake (阪神・淡路大震災) — struck along a strike-slip fault beneath northern Awaji Island, roughly 20 kilometres south of central Kobe. Its depth was shallow, only 16 kilometres, concentrating energy into a narrow corridor running northeast through Kobe, Ashiya, and Nishinomiya. Six thousand four hundred and thirty-four people died. More than 43,000 were injured. A city that considered itself well-prepared lost 300,000 residents to homelessness in a single winter morning.

The Code That Wasn't Enough

The collapse of the Hanshin Expressway Route 3 was a diagnosis as much as a catastrophe. Its concrete columns, built in the 1960s, were designed under Japan's pre-1981 seismic code — a standard written after the 1923 Great Kanto Earthquake that required buildings to survive without collapsing, but not to remain structurally functional after a major event. Under the lateral forces of Kobe's shaking, the short, stubby columns buckled. The highway tilted to 70 degrees and fell.

Japan had revised its standard in 1981. The Shin-taishin — the New Seismic Design Standard — required post-1981 buildings to remain structurally intact, not just standing. Kobe provided a grim natural experiment: pre-1981 apartment buildings collapsed while post-1981 buildings of comparable scale stood next to them, damaged but upright. The gap in survival rates was stark, unmistakable, and visible in every street photograph of the disaster. Decades of policy decisions about which buildings to upgrade, and which to leave, were now settled in rubble.

A related failure was the soft storey — a floor, typically the ground level, that is significantly less rigid than the floors above it. Open-plan ground floors converted to parking or commercial space provided far less lateral resistance than the residential storeys stacked on top. Dozens of Kobe apartment buildings failed in exactly this way, the upper floors descending through the empty space below.

Fire in a City Without Water

Within hours, more than 150 fires had broken out across the city. Broken gas mains leaked into collapsed buildings. Kerosene heaters, standard in Japanese homes in January, spilled into the wreckage. Severed electrical cables sparked in the rubble. The fires were scattered across a wide area — too many, too simultaneously, for any fire department to manage under normal conditions.

Conditions were not normal. Water mains throughout the affected area had been severed by the same forces that collapsed the buildings. Firefighters arrived and found they had nothing to fight with. In the Nagata ward, closely-packed wooden houses burned block by block. By the time the fires were out, approximately 7,500 homes had been consumed by fire alone, beyond the tens of thousands destroyed by collapse. The combination of structural failure, fire, and a broken water distribution system made the disaster far worse than any single cause could account for.

What Volunteers Built

Japan's Self-Defence Forces faced constitutional and political constraints on rapid domestic deployment without a formal government request. In the critical first hours after the earthquake, that constraint slowed the response. The Governor of Hyogo Prefecture formally requested SDF assistance the morning of the earthquake; significant numbers did not arrive until the afternoon. In the gap, residents of Kobe dug their neighbours out of collapsed buildings with their hands.

Over the weeks and months that followed, an estimated 1.3 million volunteers came to Kobe from across Japan — students, retirees, workers who had taken time off. They staffed evacuation centres, cleared debris, and provided care to survivors. 1995 is still referred to in Japan as gannen — Year One — of the Japanese volunteer movement. The experience also exposed deep failures in disaster preparedness infrastructure, and led directly to legislation that expanded the SDF's domestic emergency role and restructured Japan's disaster response framework.

The Inheritance

Japan's response to Kobe was comprehensive. The Act on Promotion of Seismic Retrofitting of Buildings was passed in 1995, the same year as the earthquake. Municipalities began systematic surveys of pre-1981 structures. Retrofit subsidies were extended, then made more generous, over the following decades. The Central Disaster Management Council was reformed and inter-agency coordination improved.

The Akashi Kaikyō Bridge — connecting Kobe to Awaji Island across the very fault that caused the earthquake — was completed in 1998, three years after the disaster. It had been under construction when the earthquake struck; the quake shifted its two main towers slightly further apart, adding about a metre to its final span. Engineers designed it to survive a magnitude 8.5. They had built across the fault with full knowledge of what it was. What they could not have known was that the fault would move beneath them while they were still building.