Here is a video showing how Olympus Mons might have formed, illustrated using eruptions of molten candle wax. Olympus Mons is thought to have achieved its size due to the lack of tectonic movement on Mars, allowing multiple eruptions from a single fissure. With each eruption, and subsequent solidification of the lava flows, the volcano increased in size. These multiple eruptions have left a distinctive striped pattern on the volcano, with each stripe showing a separate eruption. In the video we can see examples of these patterns forming in the wax. https://www.europlanet-society.org/mars-collection-of-educational-resources-3-volcanoes-mars/

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