1914 Akita-Senboku earthquake

What Happened

On 14 March 1914, at 20:00 UTC — the early hours of 15 March local time in northern Japan — a magnitude 7.0 earthquake struck Akita Prefecture on Honshu, the largest of the Japanese islands. The epicentre lay at roughly 39.5°N, 140.4°E, in the Senboku district (仙北郡, Senboku-gun) of inland Akita. The shaking killed 94 people and injured 324.

The earthquake caused liquefaction, the process by which saturated soil loses its strength and behaves like a liquid during strong shaking. Explosions simultaneous with the earthquake were reported at Mount Asama, a volcano far to the south on the border of Nagano and Gunma prefectures.

The date falls in the Taishō period (大正時代, Taishō jidai, 1912–1926), in the third year of the Taishō era.

Background

The Taishō era had begun in 1912, when the Meiji emperor died and his son acceded. Japan in 1914 was a rapidly industrialising state with a growing rail network, expanding cities, and a scientific establishment beginning to study earthquakes systematically. The Imperial Earthquake Investigation Committee, founded after the devastating 1891 Nōbi earthquake, had spent two decades sending investigators to document damaged districts and publishing their findings.

Akita Prefecture occupies the north-west of Honshu, facing the Sea of Japan. The Senboku district lies inland, in the south-central part of the prefecture, a region of river valleys and surrounding hills. Northern Honshu sits near the boundary where the North American plate meets the Eurasian plate, and the resulting deformation produces both shallow crustal earthquakes and deeper events. The 1914 event was a shallow inland earthquake, the kind that strikes close to populated districts and causes damage across a limited area rather than a wide one.

Mount Asama, roughly 400 kilometres south of the epicentre, is one of Japan's most active volcanoes. Reports of explosions there at the time of the earthquake belong to a long tradition of Japanese observations linking seismic and volcanic activity.

Why It Mattered

The 1914 Akita-Senboku earthquake belongs to the documentary record of Japanese seismology's formative decades. Investigators of the period catalogued it alongside other inland events, and its casualty figures — 94 dead, 324 injured — placed it among the more destructive Japanese earthquakes of the early twentieth century, though far below the scale of the 1923 Great Kantō earthquake that would follow nine years later.

The liquefaction observed in 1914 became part of the accumulating Japanese evidence that saturated ground in river valleys and reclaimed land fails during strong shaking. This body of observation, gathered event by event, shaped how engineers and planners later approached ground conditions in construction.

The reported explosions at Mount Asama, occurring simultaneously with the earthquake, added to the record of apparent connections between seismic and volcanic activity in Japan. Such reports fed an ongoing debate among Japanese scientists about whether the two phenomena were causally linked or merely coincidental.

For the Senboku district itself, the earthquake was a local catastrophe: deaths, injuries, and damage concentrated in a rural inland region. Events of this kind, striking away from the great cities, often received less sustained attention than urban disasters, but they were recorded in the same national registers of earthquake damage that historians and seismologists still consult.

The Name in Japanese

The Japanese name is 秋田仙北地震, read in kana as あきたせんぼくじしん, and written in romaji as Akita Senboku jishin.

The name is a compound of three elements: a prefecture, a district, and the word for earthquake.

秋 — read aki in this word. The character means "autumn." It is the first element of 秋田 (あきた, Akita), the prefecture in northern Honshu where the earthquake struck.

田 — read ta in this word. The character means "rice field" or "paddy." Together, 秋田 literally suggests "autumn rice field," though as a place name it simply designates Akita Prefecture and the city of the same name.

仙 — read sen in this word. The character carries senses of "hermit," "wizard," or "immortal" in Chinese and Japanese usage. Here it is the first element of 仙北 (せんぼく, Senboku), the name of the district.

北 — read boku in this word. The character means "north." The reading boku is a sound change from the character's more familiar reading kita, a common shift when characters combine into place names. 仙北郡 (せんぼくぐん, Senboku-gun) is Senboku District, the administrative division most seriously affected.

地 — read ji in this word. The character means "ground" or "earth."

震 — read shin in this word. The character means "shake" or "tremble." Combined, 地震 (じしん, jishin) is the standard Japanese word for "earthquake."

Read as a whole, 秋田仙北地震 names the event by place: the Akita-Senboku earthquake. Japanese earthquake names commonly follow this pattern, stacking the affected region before 地震, so that the name identifies where the shaking occurred rather than describing its size or character.

Key Figures

No individual is named in the surviving record of this earthquake as a discoverer, investigator, or official respondent. The event is documented through its date, its location, its magnitude, and its human cost: 94 dead and 324 injured, with the Senboku district of Akita Prefecture bearing the heaviest impact.