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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Stratigraphy, geomorphology, geochemistry and hazard implications of the Nejapa Volcanic Field, western Managua, Nicaragua
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Stratigraphy, geomorphology, geochemistry and hazard implications of the Nejapa Volcanic Field, western Managua, Nicaragua

机译：尼加拉瓜西部马那瓜的内贾帕火山场的地层，地貌，地球化学及其危害意义

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摘要

The Nejapa Volcanic Field (NVF) is located on the western outskirts of Managua, Nicaragua. It consists of at least 30 volcanic structures emplaced along the N-S Nejapa fault which represents the western active edge of the Managua Graben. The study area covers the central and southern parts of the volcanic field. We document the basic geomorphology, stratigraphy, chemistry and evolution of 17 monogenetic volcanic structures: Ticomo (A, B, C, D and E); Altos de Ticomo; Nejapa; San Patricio; Nejapa-Norte; Motastepe; El Hormigon; La Embajada; Asososca; Satelite; Refineria; and Cuesta El Plomo (A and B). Stratigraphy aided by radiocarbon dating suggests that 23 eruptions have occurred in the area during the past ～34,000 years. Fifteen of these eruptions originated in the volcanic field between ～28,500 and 2,130 yr BP with recurrence intervals varying from 400 to 7,000 yr. Most of these eruptions were phreatomagmatic with minor strombolian and fissural lava flow events. A future eruption along the fault might be of a phreatomagmatic type posing a serious threat to the more than 500,000 inhabitants in western Managua.
机译：内贾帕火山场（NVF）位于尼加拉瓜马那瓜的西郊。它由沿着N-S Nejapa断层布置的至少30个火山结构组成，该断层代表了Managua Graben的西部活动边缘。研究区域覆盖了火山田的中部和南部。我们记录了17个单相火山构造的基本地貌，地层，化学和演化：Ticomo（A，B，C，D和E）； Altos de Ticomo；内贾帕圣帕特里西奥Nejapa-Norte； Motastepe; El Hormigon； La Embajada; Asososca;卫星;精炼厂;和Cuesta El Plomo（A和B）。借助放射性碳测年的地层学表明，在过去约34,000年中，该地区发生了23次喷发。其中有15次喷发起源于〜28,500至2,130年BP之间的火山场，复发间隔为400至7,000年。这些喷发大多是岩浆喷发，伴有少量的Strombolian和裂隙性熔岩流事件。沿断层的未来喷发可能是吞噬岩型的，对马那瓜西部的500,000居民构成了严重威胁。

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