The earthquake struck at a focal depth of just 15 kilometers -- shallow enough to concentrate its energy with devastating efficiency. The epicenter lay in what was then Tainan Prefecture, in the town known under Japanese administration as Chuho Village in the Kagi District, and in modern-day terms as Zhongpu, Chiayi County, just southeast of Chiayi City. The location was grimly familiar to seismologists: it sat close to the fault that had produced the 1906 Meishan earthquake in the neighboring township. Taiwan's position atop the collision zone of the Eurasian and Philippine Sea tectonic plates ensures that seismic energy builds and releases along the island's western foothills with grim regularity. The 1941 Chungpu earthquake was the fourth-deadliest of the 20th century in Taiwan.

The toll was staggering for a magnitude 7.1 event. According to Taiwan's Central Weather Bureau, 358 people were killed and 733 injured. The predawn timing -- 3:19 am -- meant most victims were asleep when their homes fell on them. A total of 4,520 dwellings were completely destroyed and 11,086 partially destroyed, devastating towns across what is now Chiayi County and extending into Yunlin and Tainan. Gas lines ruptured, electricity failed, and transportation networks buckled. The earthquake also triggered a landslide on Caoling Mountain that dammed the river below, creating the temporary Caoling Lake. This was not the first time: the same mountain has dammed the same river multiple times over the past two centuries in response to earthquakes and typhoons, creating and draining a lake in a cycle of geological repetition.

Taiwan was a Japanese colony in December 1941, and the attack on Pearl Harbor ten days earlier had electrified the island with a volatile mix of imperial pride and existential anxiety. When the ground heaved in the middle of the night, many residents -- cut off from reliable information, living under wartime censorship, and primed for catastrophe -- leaped to the conclusion that American bombs were falling. The false rumor of retaliatory bombing revealed how deeply the war had penetrated daily consciousness even in agricultural towns far from any military target. Japanese colonial authorities had to contend not only with rescue and rebuilding but with a population whose fear of the earthquake was compounded by fear of a war they could not see but could feel pressing in from every direction.

The 1941 Chungpu earthquake was neither the first nor the last major temblor to strike this stretch of Taiwan's western foothills. The 1906 Meishan earthquake hit the neighboring township with similar force, and the catastrophic 1999 Jiji earthquake would later devastate central Taiwan along related fault systems. The Caoling Mountain landslide that dammed the river in 1941 repeated a pattern that has occurred at least four times since the early 19th century -- the same slope failing, the same valley flooding, the same temporary lake forming and eventually breaching. For the communities of Chiayi County, seismic risk is not an abstraction but a recurring fact of life, woven into the landscape as visibly as the rice paddies and betel nut palms that cover the plains below the fault lines.