Japan Meteorological Agency magnitude scale

The Japan Meteorological Agency magnitude scale (Japanese: 気象庁マグニチュード) is a seismic magnitude scale set by the Japan Meteorological Agency.[1]

Overview

In Japan, for shallow (depth < 60 km) earthquakes within 600 km, the Japanese Meteorological Agency calculates[2] a magnitude labeled MJMA, MJMA, or MJ. (These should not be confused with moment magnitudes JMA calculates, which are labeled Mw(JMA) or M(JMA), nor with the Shindo intensity scale.) JMA magnitudes are based (as typical with local scales) on the maximum amplitude of the ground motion; they agree "rather well"[3] with the seismic moment magnitude Mw  in the range of 4.5 to 7.5,[4] but underestimate larger magnitudes.

Notes

  1. ^ 第２版,世界大百科事典内言及, 日本大百科全書(ニッポニカ),精選版 日本国語大辞典,ブリタニカ国際大百科事典 小項目事典,知恵蔵,デジタル大辞泉,百科事典マイペディア,世界大百科事典. "マグニチュードとは". コトバンク (in Japanese). Retrieved 2021-06-02.{{cite web}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)
  2. ^ Katsumata 1996; Bormann, Wendt & Di Giacomo 2013, §3.2.4.7, p. 78; Doi 2010.
  3. ^ Bormann & Saul 2009, p. 2478.
  4. ^ See also figure 3.70 in NMSOP-2.

Sources

  • Katsumata, A. (June 1996), "Comparison of magnitudes estimated by the Japan Meteorological Agency with moment magnitudes for intermediate and deep earthquakes.", Bulletin of the Seismological Society of America, 86 (3): 832–842, Bibcode:1996BuSSA..86..832K, doi:10.1785/BSSA0860030832, S2CID 130279928.
  • Bormann, P.; Wendt, S.; Di Giacomo, D. (2013), "Chapter 3: Seismic Sources and Source Parameters", in Bormann (ed.), New Manual of Seismological Observatory Practice 2 (NMSOP-2), doi:10.2312/GFZ.NMSOP-2_ch3, archived from the original (PDF) on 2019-08-04, retrieved 2021-06-02.
  • Bormann, P.; Saul, J. (2009), "Earthquake Magnitude" (PDF), Encyclopedia of Complexity and Applied Systems Science, vol. 3, pp. 2473–2496.
  • Doi, K. (2010), "Operational Procedures of Contributing Agencies" (PDF), Bulletin of the International Seismological Centre, 47 (7–12): 25, ISSN 2309-236X. Also available here (sections renumbered).


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