noun
moment magnitude
Seismological scale for measuring earthquake size, replacing the older Richter scale for large events.
東日本大震災のモーメントマグニチュードは9.0だった。
The moment magnitude of the Great East Japan Earthquake was 9.0.
Variant with interpunct, sometimes used for clarity.
General term for earthquake magnitude; often refers to the Richter scale in casual use, while モーメントマグニチュード is a specific modern scale.
Borrowed from English 'moment magnitude', a technical term in seismology.