What is the Japanese legend held that earthquake were caused by a giant one of these swimming below the surface?

In Japanese legend, earthquakes are attributed to a giant catfish known as "Namazu." According to the myth, Namazu resides beneath the earth and causes tremors by thrashing about. The deity Kashima is said to control Namazu by placing a stone on its head to prevent it from moving, thus maintaining stability. When the stone is removed, Namazu's movements result in earthquakes.