| 单词 | somma ring |
| 释义 | > as lemmassomma ring A remnant of an older volcanic cone which partly or wholly encircles a younger cone; the rim of a caldera. Frequently attributive, as somma ring. ΘΚΠ the world > the earth > land > landscape > high land > volcano > [noun] > cone or peak pike1555 puy1827 cone1830 hornito1830 monticule1830 cinder-cone1849 parasitic cone1863 mud cone1868 piton1886 driblet cone1888 sommac1910 shield1937 c1910 H. R. Mill Dict. Geogr. Terms in L. D. Stamp Gloss. Geogr. Terms (1961) 426 Somma, originally, the rampart remaining from the old crater of Vesuvius and forming an arc around one side of the new one. The name is sometimes extended to similar formations in other volcanoes. 1917 T. G. Bonney T. Anderson's Volcanic Studies 2nd Ser. vii. 39 This [ridge], according to Dr. Anderson, forms a Somma ring within which rises a smaller and a larger crater, both intermittently active. 1940 Bull. Volcanologique 6 217 The older volcanic mass on the eastern side may be a continuation of the Somma. 1944 C. A. Cotton Volcanoes xi. 167 An example of a large cumulo-dome which has been built within a wide caldera or ‘Somma ring’ is the Soufrière of Guadeloupe, in the Lesser Antilles. 1975 Fielder & Wilson Volcanoes of Earth, Moon & Mars vii. 88/1 The so-called somma-type of nested cone..is named after Mount Somma, a residual portion of the encircling volcanic rim unit which was the precursor of the present, centrally disposed, Vesuvius. 1979 Nature 1 Nov. 24/1 It [sc. Soufrière volcano, St. Vincent] is a strato-volcano 1,220 m high with an open summit crater 1·6 km in diameter located in the southern part of a 2-km wide somma crater. < as lemmas |
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