QUOTE FROM ARTICLE BELOW
De Vaux believes that the theophany of Sinai was a description of a volcanic eruption in northern Arabia (1978, 432-8). Exodus 19:18 describes the mountain like a furnace of smoke. From a distance it would look like a pillar of cloud in the day, and a pillar of fire at night. Following this cloud of smoke would lead them right to the volcano. There are no volcanoes in Sinai, but there are several in northern Arabia (Lee 1996, 20). The only known large eruption around this time is Santorini on the Greek island of Thera (Simkin et al. 1981, 111). Professor Goedicke thinks a giant tidal-like wave called a tsunami caused by the eruption of Santorini, destroyed the Egyptian army, and the eruption formed the pillar of cloud and fire in Exodus (Shanks 1981, 42-50; Oren 1981, 46-53). Note that at the time of Ogyges there occurred the first great deluge in Greece. Ogyges "lived at the same time of the Exodus from Egypt" (Eusebius 1981, 524). Maybe a tsunami caused this deluge in Greece? Jewish tradition seems to place Mt. Sinai in Arabia. Demetrius stated that Dedan was Jethro's ancestor which is identified with the oasis of el-'Ela, and when Moses went to Midian he stayed in Arabia (De Vaux 1978, 435). In Josephus' book Antiquities of the Jews he placed Sinai where the city of Madiane was (Antiquities, II.264; III.76). In the Babylonian Talmud (Sotah 5a) R. Huna and R. Hisda say, "the Holy One, blessed be He, ignored all the mountains and heights and caused His Shechinah to abide upon Mount Sinai" (Freedman and Simon 1935, 18-19). According to Old Testament passages Mt. Sinai is identified with Seir and Mt. Paran. Deuteronomy 33:2 says, "The Lord came from Sinai, and rose up from Seir unto them; he shined forth from mount Paran" (KJV, see also Judges 5:4-5, Hab. 3:3,7; Axelsson, 1987; Simons 1959). It seems that the itinerary that was followed in Numbers 33:18-36 locates Sinai in northern Arabia. Midian was also located here (I Kings 11:18) where Moses lived with Jethro, priest of Midian, for forty years (Exodus 2:15, 3:1).
SEE THIS LIST FOR BIBLE VERSES THAT SUGGEST GOD WAS VOLCANIC ACTIVITY...i.e. not real.