余震

• Reading: よしん
• Romaji: yoshin
• Kanji breakdown: 余 (yo) — remaining, lingering; 震 (shin) — earthquake, tremor
• Pronunciation: /jo.ɕin/

Meaning

Aftershock. A smaller earthquake that occurs in the same region after a larger main earthquake, as the crust adjusts to the stress changes caused by the primary event.

A compound noun used extensively in Japanese seismology and daily life, given Japan's position on the Pacific Ring of Fire. Following a major 本震 (main earthquake), 余震 can continue for weeks or months, sometimes reaching magnitudes strong enough to cause further damage. Japanese disaster agencies issue 余震情報 to inform the public of expected frequency and intensity. The word is among the most practically important in Japanese disaster vocabulary.

Examples

1. 本震から数日が経った今も断続的に余震が続き、住民は不安な夜を過ごしている。 Even days after the main shock, intermittent aftershocks continue, and residents are spending anxious nights.
2. 余震の揺れに備えて、倒れやすい家具はすべて固定しておくことが推奨される。 It is recommended that all furniture liable to topple be secured in preparation for aftershock tremors.
3. マグニチュード7クラスの地震の後には、大規模な余震が発生する可能性が高い。 After an earthquake of magnitude 7 or above, there is a high probability that large aftershocks will occur.

Usage Guide

Context: seismology, disaster management, news

Tone: informational

Origin & History

Sino-Japanese compound. 余 (yo) means remaining, surplus, or lingering, and 震 (shin) means earthquake or tremor. Together they describe seismic activity that lingers after the main event.

Cultural Context

Era: Modern

Generation: All ages

Social background: Universal