重力を測ると地下の様子や火山のマグマが分かる/en - 版の履歴

MamechiAdmin: 英語訳を取り込み（pages/translations_en.json）

2026-10-29T10:35:25Z

英語訳を取り込み（pages/translations_en.json）

← 古い版		2026年10月29日 (木) 19:35時点における版
2行目:		2行目:
	{{豆知識		{{豆知識
	\|番号=0017		\|番号=0017
			\|投稿者=まめち編集部
	\|本文=The Geospatial Information Authority of Japan measures gravity across the country to maintain the national reference, and the values are used to explore for resources and to estimate active faults; measuring repeatedly at the same spot can even track the movement of magma in a volcano.		\|本文=The Geospatial Information Authority of Japan measures gravity across the country to maintain the national reference, and the values are used to explore for resources and to estimate active faults; measuring repeatedly at the same spot can even track the movement of magma in a volcano.
	\|なぜ=If there is heavy rock or a cavity underground, gravity directly above it changes slightly.		\|なぜ=If there is heavy rock or a cavity underground, gravity directly above it changes slightly.

MamechiAdmin: 英語訳の「更新が必要」の印を外す（訳は対応表と同じ）

2026-10-29T04:00:31Z

英語訳の「更新が必要」の印を外す（訳は対応表と同じ）

← 古い版		2026年10月29日 (木) 13:00時点における版
2行目:		2行目:
	{{豆知識		{{豆知識
	\|番号=0017		\|番号=0017
	\|本文=~~<span class="mw-translate-fuzzy">~~The Geospatial Information Authority of Japan measures gravity across the country to maintain the national reference, and the values are used to explore for resources and to estimate active faults; measuring repeatedly at the same spot can even track the movement of magma in a volcano.~~</span>~~		\|本文=The Geospatial Information Authority of Japan measures gravity across the country to maintain the national reference, and the values are used to explore for resources and to estimate active faults; measuring repeatedly at the same spot can even track the movement of magma in a volcano.
	\|なぜ=If there is heavy rock or a cavity underground, gravity directly above it changes slightly.		\|なぜ=If there is heavy rock or a cavity underground, gravity directly above it changes slightly.
	\|ジャンル=科学・自然		\|ジャンル=科学・自然

MamechiAdmin: 英語訳を取り込み（pages/translations_en.json）

2026-10-29T03:58:51Z

英語訳を取り込み（pages/translations_en.json）

← 古い版		2026年10月29日 (木) 12:58時点における版
2行目:		2行目:
	{{豆知識		{{豆知識
	\|番号=0017		\|番号=0017
	\|本文=The Geospatial Information Authority of Japan measures gravity across the country to maintain the national reference, and the values are used to explore for resources and to estimate active faults; measuring repeatedly at the same spot can even track the movement of magma in a volcano.		\|本文=<span class="mw-translate-fuzzy">The Geospatial Information Authority of Japan measures gravity across the country to maintain the national reference, and the values are used to explore for resources and to estimate active faults; measuring repeatedly at the same spot can even track the movement of magma in a volcano.</span>
	\|なぜ=If there is heavy rock or a cavity underground, gravity directly above it changes slightly.		\|なぜ=If there is heavy rock or a cavity underground, gravity directly above it changes slightly.
	\|ジャンル=科学・自然		\|ジャンル=科学・自然

MamechiAdmin: 英語訳を取り込み（pages/translations_en.json）

2026-10-29T03:57:29Z

英語訳を取り込み（pages/translations_en.json）

← 古い版		2026年10月29日 (木) 12:57時点における版
2行目:		2行目:
	{{豆知識		{{豆知識
	\|番号=0017		\|番号=0017
	\|本文=~~If there is heavy rock or a cavity underground, gravity directly above it changes slightly.~~ The Geospatial Information Authority of Japan measures gravity across the country to maintain the national reference, and the values are used to explore for resources and to estimate active faults; measuring repeatedly at the same spot can even track the movement of magma in a volcano.		\|本文=The Geospatial Information Authority of Japan measures gravity across the country to maintain the national reference, and the values are used to explore for resources and to estimate active faults; measuring repeatedly at the same spot can even track the movement of magma in a volcano.
			\|なぜ=If there is heavy rock or a cavity underground, gravity directly above it changes slightly.
	\|ジャンル=科学・自然		\|ジャンル=科学・自然
	\|ファクト度=A		\|ファクト度=A

FuzzyBot: 翻訳元ページの新版に適合するように更新

2026-10-29T03:04:16Z

翻訳元ページの新版に適合するように更新

新規ページ

<languages/>
{{豆知識
|番号=0017
|本文=If there is heavy rock or a cavity underground, gravity directly above it changes slightly. The Geospatial Information Authority of Japan measures gravity across the country to maintain the national reference, and the values are used to explore for resources and to estimate active faults; measuring repeatedly at the same spot can even track the movement of magma in a volcano.
|ジャンル=科学・自然
|ファクト度=A
|ファクト度の根拠=Explanation by a primary source (GSI) agrees with a university report on repeated gravity measurements at Sakurajima
|ネタ度=A
|ネタ度の根拠=Surprising idea: seeing the invisible underground through weight
|便利度=該当なし
|便利度の根拠=A fact worth knowing for its own sake
|検証ステータス=根拠あり
|根拠1URL=https://www.gsi.go.jp/buturisokuchi/grageo_gravity
|根拠1要約=Explanation by GSI. Gravity also changes with the density structure underground; the results are used for resource exploration and estimating active faults. Measuring continuously at the same spot also lets you monitor things like the movement of magma
|根拠1格付け=一次
|根拠2URL=https://www.dpri.kyoto-u.ac.jp/hapyo/22/pdf/B110.pdf
|根拠2要約=Report by the Disaster Prevention Research Institute, Kyoto University, "Repeated relative gravity measurements at Sakurajima volcano (FY2021)". Gravity observation is effective for detecting changes in underground mass with volcanic activity; an increase of up to about 0.2 milligal was seen in the active period from the 1970s to the early 1990s
|根拠2格付け=一次
|補足=The changes seen at volcanoes are small, from a few microgal to 0.2 milligal (a few hundred-millionths to about one five-millionth of gravity), and rain and groundwater also change gravity, so those effects are removed before reading. The main purpose of GSI's gravity survey is the national gravity reference and accurate elevations; volcano monitoring is one of the uses. That dense rock changes gravity is also in the Japanese Wikipedia article on gravity anomalies.
|検証日時=2026-10-29
|検証方式=AI＋人
|本家既出チェック=本家に既出
|本家の該当ページ=https://ja.wikipedia.org/wiki/重力異常
|派生元=体重計の数字は緯度が高いほど大きく出る
}}