![fabfilter volcano swell fabfilter volcano swell](https://i.ytimg.com/vi/TrvbrtfGyR8/maxresdefault.jpg)
Edi Suhanto, Made Agung-Volcanological Survey of Indonesia, Bandung, Indonesia. François Beauducel and François-Henri Cornet-Département de Sismologie, Institut de Physique du Globe de Paris, France.François Beauducel & François-Henri Cornet-Institut de Physique du Globe de Paris, Dpt Seismology, Edi Suhanto, Made Agung-Volcanological Survey of Indonesia, Constraint from displacement data on magma flux at Merapi volcano, Java.This sacred axis connected the hyangs or spirits of mountain revered since ancient times-often identified as 'Mbah Petruk' by Javanese people-The Sultan of Yogyakarta as the leader of the Javanese kingdom, and Nyi Roro Kidul as the queen of the Southern Ocean, the female ocean deity revered by Javanese people and also mythical consort of Javanese kings. The sacred axis is signified by Merapi peak in the north, the Tugu Yogyakarta monument near Yogyakarta main train station, the axis runs along Malioboro street to Northern Alun-alun (square) across Keraton Yogyakarta (sultan palace), Southern Alun-alun, all the way to Bantul and finally reach Samas and Parangkusumo beach on the estuary of Opak river and Southern Ocean. For Yogyakarta Sultanate, Merapi holds a significant cosmological symbolism, because it forms a sacred north-south axis line between Merapi peak and Southern Ocean (Indian Ocean). To keep the volcano quiet and to appease the spirits of the mountain, the Javanese regularly bring offerings on the anniversary of the sultan of Yogyakarta's coronation.