"mainshock" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "main",
        "3": "shock"
      },
      "expansion": "main + shock",
      "name": "compound"
    }
  ],
  "etymology_text": "From main + shock.",
  "forms": [
    {
      "form": "mainshocks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mainshock (plural mainshocks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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          "source": "w"
        },
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          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The largest earthquake in a sequence, sometimes preceded by foreshocks and almost always followed by aftershocks which are of lesser intensity."
      ],
      "id": "en-mainshock-en-noun-9siDzUE~",
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "earthquake",
          "earthquake"
        ],
        [
          "foreshock",
          "foreshock"
        ],
        [
          "aftershock",
          "aftershock"
        ]
      ],
      "raw_glosses": [
        "(geology) The largest earthquake in a sequence, sometimes preceded by foreshocks and almost always followed by aftershocks which are of lesser intensity."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "maximum shock in earthquake",
          "word": "pääjäristys"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "maximum shock in earthquake",
          "tags": [
            "neuter"
          ],
          "word": "Hauptbeben"
        },
        {
          "code": "ja",
          "lang": "Japanese",
          "roman": "honshin",
          "sense": "maximum shock in earthquake",
          "word": "本震"
        }
      ]
    }
  ],
  "word": "mainshock"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "main",
        "3": "shock"
      },
      "expansion": "main + shock",
      "name": "compound"
    }
  ],
  "etymology_text": "From main + shock.",
  "forms": [
    {
      "form": "mainshocks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mainshock (plural mainshocks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
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        "Pages with entries",
        "Terms with Finnish translations",
        "Terms with German translations",
        "Terms with Japanese translations",
        "en:Geology"
      ],
      "glosses": [
        "The largest earthquake in a sequence, sometimes preceded by foreshocks and almost always followed by aftershocks which are of lesser intensity."
      ],
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "earthquake",
          "earthquake"
        ],
        [
          "foreshock",
          "foreshock"
        ],
        [
          "aftershock",
          "aftershock"
        ]
      ],
      "raw_glosses": [
        "(geology) The largest earthquake in a sequence, sometimes preceded by foreshocks and almost always followed by aftershocks which are of lesser intensity."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "maximum shock in earthquake",
      "word": "pääjäristys"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "maximum shock in earthquake",
      "tags": [
        "neuter"
      ],
      "word": "Hauptbeben"
    },
    {
      "code": "ja",
      "lang": "Japanese",
      "roman": "honshin",
      "sense": "maximum shock in earthquake",
      "word": "本震"
    }
  ],
  "word": "mainshock"
}