January 27, 2021 at 14:07:00 JST
Central and eastern Iburi Region, Hokkaido · M5.4 · Shindo 4
胆振地方中東部
Central and eastern Iburi Region, Hokkaido earthquake history →
Places with the strongest observed Shindo
These municipalities had the highest station readings in this report. Open a place to compare this earthquake with its local history.
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Shindo readings and epicentre
Each numbered marker is an actual station reading. The orange M marker shows the epicentre.
Observed Shindo by station
These are actual readings reported at JMA and partner stations, not estimates.
Scroll horizontally to see the full table.
| Shindo | Station | Prefecture | Distance from epicentre |
|---|---|---|---|
| 4 | Niikappu Town新冠町北星町 | Hokkaido | 46.0 km |
| 3 | Atsuma Town厚真町鹿沼 | Hokkaido | 10.7 km |
| 3 | Mukawa Townむかわ町穂別 | Hokkaido | 12.6 km |
| 3 | Mukawa Townむかわ町松風 | Hokkaido | 15.5 km |
| 3 | Abira Town安平町早来北進 | Hokkaido | 16.7 km |
| 3 | Hidaka Region日高地方日高町門別 | Hokkaido | 24.8 km |
| 3 | Naganuma Town長沼町中央 | Hokkaido | 42.3 km |
| 3 | Namporo Town南幌町栄町 | Hokkaido | 49.2 km |
| 3 | Shinhidaka Town新ひだか町静内山手町 | Hokkaido | 49.4 km |
| 3 | Shinhidaka Town新ひだか町静内御幸町 | Hokkaido | 50.2 km |
| 3 | Urakawa Town浦河町潮見 | Hokkaido | 87.5 km |
| 3 | Muroran City室蘭市寿町 | Hokkaido | 88.7 km |
| 3 | Hakodate City函館市新浜町 | Hokkaido | 119.9 km |
| 3 | Urahoro Town浦幌町桜町 | Hokkaido | 136.4 km |
| 3 | Onbetsu, Kushiro City釧路市音別町中園 | Hokkaido | 159.3 km |
| 3 | Shiranuka Town白糠町西1条 | Hokkaido | 171.7 km |
| 3 | Hashikami Town階上町道仏 | Aomori | 251.9 km |
| 2 | Atsuma Town厚真町京町 | Hokkaido | 10.1 km |
| 2 | Biratori Town平取町本町 | Hokkaido | 16.2 km |
| 2 | Abira Town安平町追分柏が丘 | Hokkaido | 23.9 km |
| 2 | Biratori Town平取町振内 | Hokkaido | 24.8 km |
| 2 | 新千歳空港 | Hokkaido | 27.9 km |
| 2 | Biratori Town平取町仁世宇 | Hokkaido | 30.8 km |
| 2 | Chitose City千歳市北栄 | Hokkaido | 32.5 km |
| 2 | Tomakomai City苫小牧市末広町 | Hokkaido | 32.6 km |
| 2 | Tomakomai City苫小牧市旭町 | Hokkaido | 32.9 km |
| 2 | Yubari City夕張市若菜 | Hokkaido | 36.6 km |
| 2 | Eniwa City恵庭市京町 | Hokkaido | 39.8 km |
| 2 | Hidaka Region日高地方日高町日高 | Hokkaido | 41.9 km |
| 2 | Kuriyama Town栗山町松風 | Hokkaido | 43.8 km |
| 2 | Shinhidaka Town新ひだか町静内御園 | Hokkaido | 50.1 km |
| 2 | Iwamizawa City岩見沢市栗沢町東本町 | Hokkaido | 50.9 km |
| 2 | Shinhidaka Town新ひだか町静内農屋 | Hokkaido | 51.5 km |
| 2 | Sapporo Atsubetsu Ward札幌厚別区もみじ台 | Hokkaido | 55.5 km |
| 2 | Sapporo Kiyota Ward札幌清田区平岡 | Hokkaido | 56.6 km |
| 2 | Ebetsu City江別市高砂町 | Hokkaido | 58.6 km |
| 2 | Ebetsu City江別市緑町 | Hokkaido | 59.4 km |
| 2 | Mikasa City三笠市幸町 | Hokkaido | 61.9 km |
| 2 | Sapporo Shiroishi Ward札幌白石区北郷 | Hokkaido | 62.0 km |
| 2 | Shinshinotsu Village新篠津村第47線 | Hokkaido | 65.4 km |
| 2 | Sapporo Higashi Ward札幌東区元町 | Hokkaido | 67.3 km |
| 2 | Shinhidaka Town新ひだか町三石旭町 | Hokkaido | 68.0 km |
| 2 | Bibai City美唄市西3条 | Hokkaido | 70.9 km |
| 2 | Sapporo Kita Ward札幌北区新琴似 | Hokkaido | 71.2 km |
| 2 | Sapporo Kita Ward札幌北区篠路 | Hokkaido | 71.6 km |
| 2 | Sapporo Kita Ward札幌北区太平 | Hokkaido | 72.2 km |
| 2 | 胆振伊達市大滝区本町 | Hokkaido | 75.5 km |
| 2 | Sapporo Teine Ward札幌手稲区前田 | Hokkaido | 76.3 km |
| 2 | Ishikari City石狩市花川 | Hokkaido | 76.6 km |
| 2 | Urakawa Town浦河町野深 | Hokkaido | 77.1 km |
| 2 | Shintoku Town新得町2条 | Hokkaido | 80.0 km |
| 2 | 十勝清水町南4条 | Hokkaido | 80.2 km |
| 2 | Noboribetsu City登別市桜木町 | Hokkaido | 81.7 km |
| 2 | Urausu Town浦臼町ウラウスナイ | Hokkaido | 82.4 km |
| 2 | Urakawa Town浦河町築地 | Hokkaido | 86.5 km |
| 2 | Ashibetsu City芦別市旭町 | Hokkaido | 91.4 km |
| 2 | Shikaoi Town鹿追町東町 | Hokkaido | 92.3 km |
| 2 | Nakasatsunai Village中札内村東2条 | Hokkaido | 93.4 km |
| 2 | Shintotsukawa Town新十津川町中央 | Hokkaido | 94.9 km |
| 2 | Sarabetsu Village更別村更別 | Hokkaido | 97.7 km |
| 2 | Samani Town様似町栄町 | Hokkaido | 100.0 km |
| 2 | Obihiro City帯広市東4条 | Hokkaido | 102.2 km |
| 2 | Obihiro City帯広市東6条 | Hokkaido | 102.2 km |
| 2 | Otofuke Town音更町元町 | Hokkaido | 103.2 km |
| 2 | 十勝大樹町東本通 | Hokkaido | 107.4 km |
| 2 | Makubetsu Town幕別町忠類錦町 | Hokkaido | 108.4 km |
| 2 | Makubetsu Town幕別町本町 | Hokkaido | 113.7 km |
| 2 | Hiroo Town広尾町白樺通 | Hokkaido | 116.0 km |
| 2 | 十勝大樹町生花 | Hokkaido | 116.8 km |
| 2 | Hiroo Town広尾町並木通 | Hokkaido | 117.2 km |
| 2 | Kamishihoro Town上士幌町上士幌 | Hokkaido | 121.3 km |
| 2 | 十勝池田町西1条 | Hokkaido | 121.3 km |
| 2 | Hakodate City函館市川汲町 | Hokkaido | 122.1 km |
| 2 | Shikabe Town鹿部町宮浜 | Hokkaido | 122.4 km |
| 2 | Toyokoro Town豊頃町茂岩本町 | Hokkaido | 124.1 km |
| 2 | Hakodate City函館市泊町 | Hokkaido | 136.6 km |
| 2 | Hombetsu Town本別町北2丁目 | Hokkaido | 139.8 km |
| 2 | Ashoro Town足寄町南1条 | Hokkaido | 140.0 km |
| 2 | Hombetsu Town本別町向陽町 | Hokkaido | 140.3 km |
| 2 | Mutsu Cityむつ市大畑町中島 | Aomori | 158.9 km |
| 2 | Higashidori Village東通村砂子又沢内 | Aomori | 167.2 km |
| 2 | Higashidori Village東通村砂子又蒲谷地 | Aomori | 168.6 km |
| 2 | Akan, Kushiro City釧路市阿寒町中央 | Hokkaido | 179.0 km |
| 2 | 釧路市黒金町 | Hokkaido | 197.0 km |
| 2 | Shibecha Town標茶町塘路 | Hokkaido | 210.1 km |
| 2 | Noheji Town野辺地町田狭沢 | Aomori | 215.5 km |
| 2 | Hiranai Town平内町小湊 | Aomori | 215.5 km |
| 2 | Noheji Town野辺地町野辺地 | Aomori | 216.8 km |
| 2 | Tohoku Town東北町上北南 | Aomori | 227.3 km |
| 2 | Shichinohe Town七戸町森ノ上 | Aomori | 228.6 km |
| 2 | Oirase Townおいらせ町中下田 | Aomori | 238.5 km |
| 2 | Rokunohe Town六戸町犬落瀬 | Aomori | 238.7 km |
| 2 | Hachinohe City八戸市湊町 | Aomori | 244.5 km |
| 2 | Hachinohe City八戸市内丸 | Aomori | 246.9 km |
| 2 | Gonohe Town五戸町古舘 | Aomori | 247.6 km |
| 2 | Gonohe Town五戸町倉石中市 | Aomori | 251.1 km |
| 2 | 青森南部町苫米地 | Aomori | 253.0 km |
| 2 | 岩手洋野町種市 | Iwate | 255.6 km |
| 2 | Hachinohe City八戸市南郷 | Aomori | 259.7 km |
| 2 | Karumai Town軽米町軽米 | Iwate | 267.1 km |
| 2 | Nemuro City根室市厚床 | Hokkaido | 272.4 km |
| 2 | Betsukai Town別海町本別海 | Hokkaido | 278.0 km |
| 2 | Kuji City久慈市枝成沢 | Iwate | 278.2 km |
| 2 | Fudai Village普代村銅屋 | Iwate | 298.9 km |
| 2 | Miyako City宮古市田老 | Iwate | 328.7 km |
| 2 | 北広島市共栄 | Hokkaido | — |
| 1 | Yuni Town由仁町新光 | Hokkaido | 37.5 km |
| 1 | Shimukappu Village占冠村中央 | Hokkaido | 45.1 km |
| 1 | Eniwa City恵庭市漁平 | Hokkaido | 48.0 km |
| 1 | Shiraoi Town白老町大町 | Hokkaido | 55.3 km |
| 1 | Shiraoi Town白老町緑丘 | Hokkaido | 55.5 km |
| 1 | Iwamizawa City岩見沢市鳩が丘 | Hokkaido | 58.4 km |
| 1 | Iwamizawa City岩見沢市5条 | Hokkaido | 59.7 km |
| 1 | Sapporo Toyohira Ward札幌豊平区月寒東 | Hokkaido | 61.2 km |
| 1 | Sapporo Minami Ward札幌南区石山 | Hokkaido | 62.5 km |
| 1 | Sapporo Minami Ward札幌南区川沿 | Hokkaido | 64.1 km |
| 1 | Sapporo Chuo Ward札幌中央区南4条 | Hokkaido | 66.5 km |
| 1 | Iwamizawa City岩見沢市北村赤川 | Hokkaido | 66.9 km |
| 1 | Sapporo Chuo Ward札幌中央区北2条 | Hokkaido | 67.9 km |
| 1 | Tobetsu Town当別町白樺 | Hokkaido | 69.8 km |
| 1 | Minamifurano Town南富良野町役場 | Hokkaido | 69.9 km |
| 1 | Sapporo Nishi Ward札幌西区琴似 | Hokkaido | 70.4 km |
| 1 | Minamifurano Town南富良野町幾寅 | Hokkaido | 70.8 km |
| 1 | Tsukigata Town月形町円山公園 | Hokkaido | 76.3 km |
| 1 | Ishikari City石狩市花畔 | Hokkaido | 77.4 km |
| 1 | Furano City富良野市末広町 | Hokkaido | 77.6 km |
| 1 | Furano City富良野市若松町 | Hokkaido | 78.2 km |
| 1 | Ishikari City石狩市聚富 | Hokkaido | 79.6 km |
| 1 | Noboribetsu City登別市鉱山 | Hokkaido | 83.2 km |
| 1 | Nakafurano Town中富良野町本町 | Hokkaido | 86.3 km |
| 1 | Kamisunagawa Town上砂川町上砂川 | Hokkaido | 86.7 km |
| 1 | Ishikari City石狩市厚田 | Hokkaido | 90.6 km |
| 1 | Kamifurano Town上富良野町大町 | Hokkaido | 92.1 km |
| 1 | Ashibetsu City芦別市北2条 | Hokkaido | 92.4 km |
| 1 | Sobetsu Town壮瞥町滝之町 | Hokkaido | 92.6 km |
| 1 | Muroran City室蘭市山手町 | Hokkaido | 94.6 km |
| 1 | Takikawa City滝川市新町 | Hokkaido | 94.7 km |
| 1 | Takikawa City滝川市大町 | Hokkaido | 95.5 km |
| 1 | 胆振伊達市梅本 | Hokkaido | 95.6 km |
| 1 | 胆振伊達市末永町 | Hokkaido | 96.2 km |
| 1 | Otaru City小樽市勝納町 | Hokkaido | 96.6 km |
| 1 | Kutchan Town倶知安町北4条 | Hokkaido | 103.3 km |
| 1 | Kutchan Town倶知安町南1条 | Hokkaido | 104.1 km |
| 1 | Uryu Town雨竜町フシコウリウ | Hokkaido | 104.8 km |
| 1 | Akaigawa Village赤井川村赤井川 | Hokkaido | 105.2 km |
| 1 | Ishikari City石狩市浜益 | Hokkaido | 111.6 km |
| 1 | Makubetsu Town幕別町忠類明和 | Hokkaido | 111.9 km |
| 1 | Yoichi Town余市町朝日町 | Hokkaido | 113.5 km |
| 1 | Yoichi Town余市町浜中町 | Hokkaido | 113.6 km |
| 1 | Shihoro Town士幌町士幌 | Hokkaido | 113.9 km |
| 1 | Hokuryu Town北竜町竜西 | Hokkaido | 118.3 km |
| 1 | Chippubetsu Town秩父別町役場 | Hokkaido | 118.9 km |
| 1 | Hakodate City函館市尾札部町 | Hokkaido | 120.5 km |
| 1 | Erimo Townえりも町本町 | Hokkaido | 121.6 km |
| 1 | Numata Town沼田町沼田 | Hokkaido | 122.3 km |
| 1 | Hakodate City函館市日ノ浜町 | Hokkaido | 124.9 km |
| 1 | Erimo Townえりも町目黒 | Hokkaido | 125.8 km |
| 1 | Kamishihoro Town上士幌町清水谷 | Hokkaido | 126.4 km |
| 1 | 渡島森町砂原 | Hokkaido | 127.0 km |
| 1 | Shakotan Town積丹町美国町 | Hokkaido | 131.6 km |
| 1 | Erimo Townえりも町えりも岬 | Hokkaido | 132.6 km |
| 1 | 渡島森町御幸町 | Hokkaido | 134.5 km |
| 1 | 渡島森町上台町 | Hokkaido | 136.0 km |
| 1 | Oshamambe Town長万部町平里 | Hokkaido | 137.4 km |
| 1 | Nanae Town七飯町本町 | Hokkaido | 139.2 km |
| 1 | Nanae Town七飯町桜町 | Hokkaido | 139.7 km |
| 1 | Rumoi City留萌市幸町 | Hokkaido | 140.8 km |
| 1 | Hakodate City函館市美原 | Hokkaido | 142.2 km |
| 1 | Higashidori Village東通村尻屋 | Aomori | 150.3 km |
| 1 | Onbetsu, Kushiro City釧路市音別町尺別 | Hokkaido | 151.6 km |
| 1 | Kazamaura Village風間浦村易国間 | Aomori | 157.8 km |
| 1 | Kembuchi Town剣淵町仲町 | Hokkaido | 158.3 km |
| 1 | Ashoro Town足寄町上螺湾 | Hokkaido | 158.6 km |
| 1 | Oma Town大間町大間 | Aomori | 159.1 km |
| 1 | Mutsu Cityむつ市大畑町奥薬研 | Aomori | 166.1 km |
| 1 | Rikubetsu Town陸別町陸別 | Hokkaido | 166.2 km |
| 1 | Sai Village佐井村佐井 | Aomori | 169.7 km |
| 1 | Mutsu Cityむつ市金谷 | Aomori | 170.1 km |
| 1 | Mutsu Cityむつ市金曲 | Aomori | 170.4 km |
| 1 | 檜山江差町姥神 | Hokkaido | 180.1 km |
| 1 | Sai Village佐井村長後 | Aomori | 181.3 km |
| 1 | Mutsu Cityむつ市川内町 | Aomori | 186.1 km |
| 1 | Akan, Kushiro City釧路市阿寒町阿寒湖温泉 | Hokkaido | 189.0 km |
| 1 | Shosambetsu Village初山別村有明 | Hokkaido | 189.4 km |
| 1 | Yokohama Town横浜町林ノ脇 | Aomori | 190.1 km |
| 1 | Yokohama Town横浜町寺下 | Aomori | 190.4 km |
| 1 | Rokkasho Village六ヶ所村出戸 | Aomori | 195.3 km |
| 1 | 釧路市幸町 | Hokkaido | 197.0 km |
| 1 | Tsurui Village鶴居村鶴居東 | Hokkaido | 199.0 km |
| 1 | Rokkasho Village六ヶ所村尾駮 | Aomori | 199.4 km |
| 1 | Tsubetsu Town津別町幸町 | Hokkaido | 199.5 km |
| 1 | Kushiro Town釧路町別保 | Hokkaido | 204.6 km |
| 1 | Sotogahama Town外ヶ浜町平舘 | Aomori | 206.3 km |
| 1 | Hiranai Town平内町東田沢 | Aomori | 210.0 km |
| 1 | Imabetsu Town今別町今別 | Aomori | 210.7 km |
| 1 | Sotogahama Town外ヶ浜町蟹田 | Aomori | 216.6 km |
| 1 | Teshikaga Town弟子屈町弟子屈 | Hokkaido | 218.8 km |
| 1 | Yomogita Village蓬田村蓬田 | Aomori | 222.1 km |
| 1 | Shibecha Town標茶町川上 | Hokkaido | 222.2 km |
| 1 | Akkeshi Town厚岸町尾幌 | Hokkaido | 222.6 km |
| 1 | Tohoku Town東北町塔ノ沢山 | Aomori | 222.9 km |
| 1 | Misawa City三沢市桜町 | Aomori | 230.4 km |
| 1 | Aomori City青森市花園 | Aomori | 232.4 km |
| 1 | Shichinohe Town七戸町七戸 | Aomori | 233.1 km |
| 1 | Akkeshi Town厚岸町真栄 | Hokkaido | 236.1 km |
| 1 | Tsugaru Cityつがる市車力町 | Aomori | 237.4 km |
| 1 | Goshogawara City五所川原市金木町 | Aomori | 237.4 km |
| 1 | Oirase Townおいらせ町上明堂 | Aomori | 238.0 km |
| 1 | Betsukai Town別海町西春別 | Hokkaido | 239.0 km |
| 1 | Towada City十和田市西二番町 | Aomori | 240.2 km |
| 1 | Towada City十和田市西十二番町 | Aomori | 241.3 km |
| 1 | Tsugaru Cityつがる市稲垣町 | Aomori | 242.0 km |
| 1 | Towada City十和田市奥瀬 | Aomori | 245.8 km |
| 1 | Tsugaru Cityつがる市木造 | Aomori | 249.4 km |
| 1 | Aomori City青森市浪岡 | Aomori | 249.9 km |
| 1 | Tsugaru Cityつがる市柏 | Aomori | 250.0 km |
| 1 | Hamanaka Town浜中町茶内 | Hokkaido | 252.0 km |
| 1 | Fujisaki Town藤崎町水木 | Aomori | 256.1 km |
| 1 | Fujisaki Town藤崎町西豊田 | Aomori | 258.7 km |
| 1 | Hirakawa City平川市猿賀 | Aomori | 259.9 km |
| 1 | Hachinohe City八戸市島守 | Aomori | 261.2 km |
| 1 | 青森南部町沖田面 | Aomori | 261.3 km |
| 1 | Hamanaka Town浜中町湯沸 | Hokkaido | 261.6 km |
| 1 | Sannohe Town三戸町在府小路町 | Aomori | 265.0 km |
| 1 | Betsukai Town別海町常盤 | Hokkaido | 265.5 km |
| 1 | 岩手洋野町大野 | Iwate | 270.6 km |
| 1 | Ninohe City二戸市福岡 | Iwate | 275.9 km |
| 1 | Kuji City久慈市川崎町 | Iwate | 279.4 km |
| 1 | Kuji City久慈市長内町 | Iwate | 280.6 km |
| 1 | Kunohe Village九戸村伊保内 | Iwate | 280.8 km |
| 1 | Noda Village野田村野田 | Iwate | 288.0 km |
| 1 | Ninohe City二戸市浄法寺町 | Iwate | 288.5 km |
| 1 | Nemuro City根室市落石東 | Hokkaido | 292.4 km |
| 1 | Nemuro City根室市牧の内 | Hokkaido | 301.7 km |
| 1 | Kuzumaki Town葛巻町葛巻元木 | Iwate | 306.6 km |
| 1 | Tanohata Village田野畑村役場 | Iwate | 307.8 km |
| 1 | Hachimantai City八幡平市田頭 | Iwate | 318.2 km |
| 1 | Morioka City盛岡市渋民 | Iwate | 324.1 km |
| 1 | Morioka City盛岡市薮川 | Iwate | 329.1 km |
| 1 | Miyako City宮古市五月町 | Iwate | 338.8 km |
| 1 | Miyako City宮古市鍬ヶ崎 | Iwate | 339.1 km |
| 1 | Morioka City盛岡市山王町 | Iwate | 340.6 km |
| 1 | Miyako City宮古市区界 | Iwate | 344.2 km |
| 1 | Miyako City宮古市川井 | Iwate | 345.3 km |
| 1 | Yahaba Town矢巾町南矢幅 | Iwate | 350.7 km |
| 1 | Yamada Town山田町大沢 | Iwate | 356.5 km |
| 1 | Yamada Town山田町八幡町 | Iwate | 358.9 km |
| 1 | Hanamaki City花巻市大迫町 | Iwate | 362.7 km |
| 1 | Tono City遠野市青笹町 | Iwate | 376.1 km |
| 1 | Kamaishi City釜石市只越町 | Iwate | 380.3 km |
| 1 | Kamaishi City釜石市中妻町 | Iwate | 381.1 km |
| 1 | Sumita Town住田町世田米 | Iwate | 396.9 km |
| 1 | Ofunato City大船渡市大船渡町 | Iwate | 404.4 km |
| 1 | Ichinoseki City一関市室根町 | Iwate | 420.2 km |
| 1 | Kesennuma City気仙沼市唐桑町 | Miyagi | 423.0 km |
| 1 | Kesennuma City気仙沼市笹が陣 | Miyagi | 423.5 km |
| 1 | Ichinoseki City一関市千厩町 | Iwate | 423.6 km |
| 1 | Kesennuma City気仙沼市赤岩 | Miyagi | 425.7 km |
| 1 | Ichinoseki City一関市藤沢町 | Iwate | 429.9 km |
| 1 | Tome City登米市中田町 | Miyagi | 447.8 km |
| 1 | Tome City登米市迫町 | Miyagi | 450.5 km |
| 1 | Tome City登米市登米町 | Miyagi | 452.7 km |
| 1 | Ishinomaki City石巻市桃生町 | Miyagi | 464.2 km |
| 1 | Iwanuma City岩沼市桜 | Miyagi | 519.7 km |
| 1 | 根室市珸瑶瑁 | Hokkaido | — |
| 1 | 砂川市西6条 | Hokkaido | — |
Report updates
Status, time and revision available in the stored report. Field-by-field differences may not be retained.
- Confirmed
Revision 1 · p2pquake
Sources and bulletins
Multiple source bulletins do not necessarily represent multiple corrections.
- P2PQUAKEIssued: January 27, 2021 at 14:11:00Received: July 31, 2026 at 00:29:46
- P2PQUAKEIssued: January 27, 2021 at 14:11:00Received: July 31, 2026 at 00:29:46
- P2PQUAKEIssued: January 27, 2021 at 14:10:00Received: July 31, 2026 at 00:29:46
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A guide to event and issue times, hypocentre, depth, Shindo, tsunami information, preliminary reports and corrections.
Read guide →5 min readWhat does earthquake depth mean?A plain-language guide to hypocentre depth and why shallow and deep earthquakes can feel very different.
Read guide →5 min readMagnitude vs Shindo: what is the difference?Magnitude describes the size of an earthquake at its source; Shindo describes shaking at a place. Learn why they are not interchangeable.
Read guide →6 min readCan every earthquake cause a tsunami?What creates a tsunami, why magnitude alone is not enough and when to leave the coast immediately.
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