The 10 July 1804 Kisakata earthquake occurred offshore Kisakata (Akita, Japan), and widespread felt shaking was reported from Matsumae (Hokkaido) to Ohmi‐Hachiman (Shiga Prefecture). The earthquake caused strong ground motions that extensively damaged areas near the epicenter, such as along the coast of Kisakata, and the resultant tsunami caused extensive damage along the coast from Kisakata to Sakata. Furthermore, Kisakata lagoon was uplifted by dislocation during the earthquake, exposing the lagoon floor. Here, we performed a field survey of the uplift distribution based on microtopographic remnants of the former shoreline of Kisakata lagoon and used historical documents to re‐evaluate tsunami trace heights. Using ocean‐bottom reflection profiles, we estimated a fault model for the earthquake and resultant tsunami. Our model indicates that an average of 5.6 m of slip on the fault (equivalent to an Mw 7.1 earthquake) is required to explain the observed crustal deformation and tsunami height distributions, and back correction of the modeled slip reproduced well the former shoreline of Kisakata lagoon.

中文翻译：

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1804年栗方地震的断层模型（日本秋田市）

1804年7月10日发生的Kisakata地震发生在Kisakata（日本秋田）近海，据报道，从松前（北海道）到Ohmi-Hachiman（滋贺县），普遍感到发抖。地震引起强烈的地震动，震中附近的许多地区遭到严重破坏，例如在坂方海岸，由此产生的海啸对从坂方到坂田的海岸造成了广泛破坏。此外，地震期间位错隆起了高坂泻湖，使泻湖底面暴露出来。在这里，我们根据前木坂泻湖海岸线的微地形残余物，对隆升分布进行了实地调查，并使用历史文献重新评估了海啸的痕迹高度。利用海底反射剖面，我们估算了地震和由此产生的海啸的断层模型。