1026 Manju tsunami
Tsunami affecting Japan
The 1026 Manju tsunami affected the Sea of Japan coast of the then Iwami Province on June 16. Considered one of the largest tsunamis in the Sea of Japan, it generated a tsunami with waves of 10 m (33 ft) at present-day Masuda, Shimane. Off the coast, an island reportedly sank because of the waves. More than 1,000 people were killed, and 3,000 homes were destroyed. The source of the tsunami has been debated between an earthquake or undersea landslide.
Description
In historical records, locals claimed that a large stone called Kuroiwa was carried by the tsunami to its present location in Tonda, along Japan National Route 9 about 3.5 km (2.2 mi) from Masuda Station. The 5 m (16 ft) tall stone was allegedly carried 2 km (1.2 mi) from the coast at an elevation of 25 m (82 ft). A subsequent investigation revealed the stone, comprising basalt, originated from the inland mountains, as basalts do not occur at the coast, and was transported downhill by a landslide rather than the reported tsunami.
The tsunami reportedly sank the islands of Kamo, Nabeshima, and Kashiwajima, which were then busy settlements. Oral records suggest these features were solid outcrops rather than sandbars.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Jul 26, 2026. The linked authority identifier is Q11353814. Authority coordinates are 34.800, 131.800. None of the 1 selected statements returned an explicit reference. The first chronological checks are 1026.
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This entry incorporates text from “1026 Manju tsunami” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.