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Chaac-Camaxtli region
The Chaac-Camaxtli region is a volcanic region on Jupiter's moon Io, located from approximately 5 to 20°N and 130 to 160°W in its anti-Jovian hemisphere. It consists mainly of the hummocky bright plains that occupy the surface. This area is defined on the west by Chaac Patera, and on the east by Camaxtli Patera.〔 At least 10 distinct volcanic centers are located in the region, making it a volcanically active region on Io's surface. Most of the volcanism here is expressed as paterae, which range in size from circular to elliptical. A patera is defined by the International Astronomical Union as "irregular or complex craters with scalloped edges.〔" The largest volcanic structure here is the Chaac Patera (105 km X 48 km). The paterae found in the Chaac-Camaxtli region are Chaac, Balder Patera, Grannos, Ababinili, Ruaumoko, Steropes, Camaxtli, Tien Mu, Utu, and Mentu.〔
This region is full of features that provide clues to the volcanism, tectonism, and magmatic processes on Io. Similar concepts happening on Io have been thought to have occurred in Earth's past, and some terrestrial analogues occur today.
==Observations==
''Voyager 1'' provided the first images of the different geologic structures on Io. These were later used to identify key volcanic features, including color of magma to deduce composition and determine eruption sequences. The Voyager provided poor resolution photos (5–20 km/pixel) of the Chaac-Camaxtli region, which provided little further study. The photos were, however, used to map dark spots of Chaac Patera, Camaxtli Patera, and another region which is now considered Sobo Fluctus.〔 An important discovery was Io's lack of impact craters, meaning it is resurfaced at a geologically fast rate.
The main imagery used in viewing the area was produced by the Galileo I27 flyby which occurred in February 2000, which was paired with C21 low-resolution (1.4 km/pixel) color schemes. Because of the success of these pictures, different volcanic features were identified and appropriately named.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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