2023年8月1日 · Aa is a subaerial lava flow whose surface is characterized by sharp and rough or jagged irregular blocks/rubbles known as clinkers or spinose. These loose, broken, contorted, …

2010年5月6日 · There are three types of basalt lava flows: pillow, pahoehoe, and a'a. Pillow lavas are volumetrically the most abundant type because they are erupted at mid-ocean ridges and …

2022年10月26日 · Basaltic lava has a relatively low viscosity (about the same as ketchup). When you see volcanic eruptions with lava fountains or flowing rivers of lava, it is basaltic. Ultramafic …

2023年8月12日 · There are six lava flow types or morphologies: pahoehoe, aa, blocky lava, pillow lava, sheet flow, and lobate. The first three are subaerial, and the last three are subaqueous …

2023年4月18日 · Basaltic lava flows usually either have pahoehoe or ‘a‘ā morphological forms. The surfaces of pahoehoe lava flows are smooth, ropy, or billowy, and ‘a‘ā flows are rough …

Mafic (ferromagnesian, dark-coloured) lavas such as basalt characteristically form flows known by the Hawaiian names pahoehoe and aa (or a’a). Pahoehoe lava flows are characterized by …

'A'a flows are characterized most obviously by very rough top surfaces, dense interiors, and sometimes rough bottom surfaces. The loose fragments that make up the surface of flows are …

Mafic lava flows have been classically divided into two categories: pahoehoe and aa (e.g., Dutton, 1884; Macdonald, 1953). Pahoehoe is characterized by having a smooth surface, and aa has …

‘A‘ā (pronounced "ah-ah") is a Hawaiian term for lava flows that have a rough rubbly surface composed of broken lava blocks called clinkers. The incredibly spiny surface of a solidified ‘A‘ā …

The Silla Conglomerate is overlain by the Hakbong Basalt in the southern part of the Uiseong subbasin (Daegu area; Fig. 2). The basalt consists of three aa lava flow units, trachybasaltic in …