Abstract
Plausible parameters of the earthquake fault which caused the 1771 Great Meiwa Tsunami were re-estimated by comparing the result of the tsunami run-up height by the numerical simulation by Okinawa Prefectural Government and those by 1) run-up height derived from previous field works, and 2) a historical record describing the run-up height in Miyako District. The re-estimation shows that the length of the fault off Miyako and Yaeyama districts is 300 km or more. However, the slip of the fault is 20 m off Yaeyama and 8 - 14 m off Miyako.
Highlights
Introduction and PreviousWorksThe 1771 Great Meiwa tsunami (Yaeyama Earthquake Tsunami, hereafter referred as “The 1771 Tsunami”) which occurred in the western Ryukyu district on April 24, 1771 caused tremendous damages in the Yaeyama and Miyako districts, with approximately 12,000 casualties
Plausible parameters of the earthquake fault which caused the 1771 Great Meiwa Tsunami were re-estimated by comparing the result of the tsunami run-up height by the numerical simulation by Okinawa Prefectural Government and those by 1) run-up height derived from previous field works, and 2) a historical record describing the run-up height in Miyako District
The run-up heights described in the historical record are considered to be over-estimated such as the maximum height is 85 m from the Miyara Bay located on the southern coast of Ishigaki Island
Summary
The 1771 Great Meiwa tsunami (Yaeyama Earthquake Tsunami, hereafter referred as “The 1771 Tsunami”) which occurred in the western Ryukyu district on April 24, 1771 caused tremendous damages in the Yaeyama and Miyako districts, with approximately 12,000 casualties. The source area of the 1771 Tsunami has been estimated to be an M7.4-equivalent fault at 24.0 ̊N 124.3 ̊E (fore-arc area of the southwestern Ryukyu Islands, about 40 km south of Ishigaki Island) [1]. Yaeyama District, clearly describes the tsunami damage situation and maximum run-up heights from each coastal area in the Yaeyama District. The run-up heights described in the historical record are considered to be over-estimated such as the maximum height is 85 m from the Miyara Bay located on the southern coast of Ishigaki Island
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