Volcanology of Saba and St. Eustatius, Northern Lesser by M. John Roobol, Alan L. Smith

By M. John Roobol, Alan L. Smith

The elevate within the variety of earthquakes and within the temperature of the recent springs that happened among 1995 and 1997 at the islands of Saba and St. Eustatius, situated within the Northern Lesser Antilles, used to be greater than an insignificant fluke in subterranean job: a gentle volcano-seismic hindrance had produced an elevated warmth circulate. This ebook investigates this correlation and different geologic task of the lively volcanoes within the Northern Lesser Antilles. A well-researched record of the volcanoes on those hugely populated islands, the publication additionally positive aspects 5 designated maps of the sector and is a perfect accompaniment to the Netherlands Geological Survey’s geohazard document, which recommends the initiation of regimen tracking of either islands.

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The western boundary of this ridge is named Pirate Cliff and forms a vertical geological contact between the yellow, older lithified material and the younger less well-lithified deposits to the immediate west forming the sea cliffs of Cave of Rum Bay (Plate 2). The younger deposits to the west are banked up against the older buried cliff in the manner of a sector collapse scar. The relative ages of the two units is shown by their highly contrasted morphologies. The older deposits form a steep-sided promontory, whereas the younger block and ash flow deposits behind Cave of Rum Bay are very deeply gullied.

Phreatic/phreatomagmatic-style eruptions Since European settlement of the Lesser Antilles the most common style of eruptive activity has been phreatic or phreatomagmatic eruptions (Table 2). , 1980), and thin ashes with accretionary lapilli produced during the 1979 eruption of Soufriere, St. , 1982; Shepherd and Sigurdsson, 1982). Finegrained ashes with accretionary lapilli and entombed gas cavities were also characteristic of the initial stages of both the 1902 eruption of Mt. Pelée, Martinique (Smith and Roobol, 1990) and the current eruption of the Soufriere Hills, Montserrat.

This is well demonstrated by the highly irregular submarine morphology of the forearc region between the Limestone Caribbee Arc and the ocean floor trench marking the boundary with the North American plate. Here a 16 Introduction series of ridges separated by valleys extend perpendicular to the arc front. The Malliwana and Tintamarre rises separated by the Anguilla valley extend east-northeast towards the Atlantic, parallel with the elongated island of Anguilla. A similar relationship exists east-northeast of Antigua with the Man of War ridge bounded by the Antigua and Willoughby valleys.

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