Mount Mihara

Mount Mihara (三原山 Mihara-san?) is an active volcano on the Japanese island of Izu Oshima. It made both appears in 1984 Godzilla film, The Return of Godzilla and 1989 Godzilla film, Godzilla vs. Biollante.

The Return of Godzilla
Doctor Hayashida, together with geologist Minami, propose to the Japanese Cabinet, that Godzilla could be lured back to Mt. Mihara on Oshima Island by a similar signal, and a volcanic eruption could be started, capturing Godzilla. Hayashida uses the homing device to distract the nuclear behemoth. Godzilla leaves Tokyo in ruins and swims across the Tokyo Bay and Sagami Bay, following the homing device to Mt. Mihara on Izu Ōshima. Godzilla reach the top of the mountain where the device was set and falls into the mouth of the volcano. Okamura activates detonators at the volcano, creating a controlled eruption that traps Godzilla inside the heart of the volcano.

Godzilla vs. Biollante
Five years since Godzilla was entombed in the volcano, the Bio-Major agent codeanme "SSS9", in a desperate attempt to procure the Godzilla cells, and plants the explosive charges around the mouth of the Mt. Mihara and issues an ultimatum to the Diet of Japan, warning that if he don't get the cells, he will detonate the explosives and free Godzilla. Kirishima and Gondo attempt to trade, but SSS9 thwarts the attempt and runs off with the cells. The explosives go off, and Godzilla escapes.