Knowledge (XXG)

Zamama (volcano)

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335: 206: 230: 285: 22: 437:. Since steep-sided shield volcanoes have not been observed inside collapsed calderas, this indicates a failure to reform steep-sided volcanoes after the collapse, which can be associated with various variables such as change in temperature, eruptive rate, and/or lava composition. Failure to reform shield volcanoes is caused by failure to supply magma through the magma chamber. These interpretations might be a sign that current shield volcanoes will follow this pattern and transform to caldera-forming eruptive sites. 1313: 271:
eruption. This most prominent central eruption was the first to take place (18° N, 171° W). The total area changed was about 136,000 km (53,000 sq mi). Second, a new eruption caused broadening in the central dark deposits of the western side and new bright rings were deposited along the margins of the lava flows. The total area effected was about 37,000 km (14,000 sq mi). Third, Zamama's third plume was actively erupting while
192:, which identified two types of volcanic activity: persistent and sporadic. The NIMS instrument detected activity at Zamama lasting longer than one year; therefore, it is considered the persistent type. It has only been NIMS-detected five times, but NIMS-observed nine times. This lower incidence of detection could be due to observational constraints or temporary waning of activity. 457:-class; 2) a space-based UV telescope with diffraction-limited capability; 3) space-based missions that enable long-term monitoring of Io over a variety of time scales (seconds, minutes, hours, days, months, years); and 4) expanded time for Io observation on ground-based 8- to 10-m class telescopes, particularly those with nighttime Adaptive Optics capability." 943: 241:
Zamama A (18°N, 175°W), is about 40 km (25 mi) wide, 1.5 km (0.93 mi) high, and has an average slope of 40°. Slope and height were estimated by PC. It extends about 140 km (87 mi) east and beyond the topographic margin of the observed steep-sided shield. Zamama A is the
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observations. Zamama has shown three notable surface changes in the SSI collected images. Images show them as bright rings, placed within the dark lava flows, with diameters of about 370 km (230 mi). In addition, new black rings were deposited north and northeast of the central prominent
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Io is one of the most challenging Jovian moons for which to establish topography. A couple techniques aided in the making of Io's topography, such as "3D" stereo photogrammetry (SP) and "2D" photoclinometry (PC). Ionian volcanoes have been poorly characterized because of their volcanic construct,
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visit. The flow field appeared narrow/thin closer to the center, and wide/broad away from the center. This behavior might be due to a change in slope from the volcano rim to the nearby plains. The central vent emanates bright flows, due to sulfurous lava composition or silicate lava coated by
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both used thermal remote sensing to accomplish this task. Thermal remote sensing is a branch of remote sensing which deals with processing and interpretations of data in the thermal infrared (TIR) region of the electromagnetic (EM) spectrum. Zamama is a hotspot/volcanic center among 61 active
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The graph of eruption rate shows plunges which indicate lessening in diffusive activity or cooling of old flow surface. As well, it shows a spike, which indicates the beginning of a new eruption. The power output flux graph compares Zamama with other Ionian volcanoes of the same eruptive
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flows with high silica content can have temperatures as high as 1,200 °C (1,470 K; 2,190 °F). Since Zamama volcanoes have such high temperatures, this indicates siliceous magma. No actual samples of Zamama's magma have been retrieved and processed for composition.
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NIMS instrument collected data on volcanic emissions to analyze the power output. A two-temperature model is used to determine the temperature and power output. Models have shown that Zamama has a temperature of 1,173 ± 243 K (900 ± 243 °C;
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spacecraft—the Near-Infrared Mapping Spectrometer (NIMS), Solid-State Imager (SSI), Photopolarimeter-Radiometer (PPR)—collect and analyze volcanism on Io's surface. Since there are no samples collected from Io, all of the interpretations are made by studying
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Williams, David A.; Keszthelyi, Laszlo P.; Schenk, Paul M.; Milazzo, Moses P.; Lopes, Rosaly M. C.; et al. (September 2005). "The Zamama–Thor region of Io: Insights from a synthesis of mapping, topography, and Galileo spacecraft data".
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was on its 14th orbit around Jupiter. New deposits enlarged to 150 ± 5 km (93.2 ± 3.1 mi) and are centered east of the eruptive center. Total affected area was about 96,000 km (37,000 sq mi).
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Average volumetric rates decreased at the beginning of the period, which indicates a lessening in diffusive activity, or cooling of old flow surface. Later, there was an increase in volcanic activity, indicating the beginning of an
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McEwen, Alfred S.; Simonelli, Damon P.; Senske, David R.; Klaasen, Kenneth P.; Keszthelyi, Laszlo; et al. (October 1997). "High-temperature hot spots on Io as seen by the Galileo Solid State Imaging (SSI) experiment".
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Zamama C (15°N, 170°W) is located 175 km (109 mi) southeast of the Zamama volcanic center, is about 250 m (820 ft) high, and has a slope that ranges between 3°-5°. Height was determined by
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Zamama B is located 75 km (47 mi) southeast of Zamama A, and is about 40 km (25 mi) wide and 1–1.5 km (0.62–0.93 mi) high. Height was estimated by PC shadow measurements.
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NIMS data analysis was conducted to determine the variability of thermal emissions from volcanoes on Io—particularly Zamama—for 1,038 days (28 June 1996 to 2 May 1999) and the results showed:
742:; Milazzo, M.; Geissler, P.; et al. (December 2001). "Imaging of volcanic activity on Jupiter's moon Io by Galileo during the Galileo Europa Mission and the Galileo Millennium Mission". 698:
Lopes-Gautier, Rosaly; McEwen, Alfred S.; Smythe, William B.; Geissler, P. E.; Kamp, L.; et al. (August 1999). "Active Volcanism on Io: Global Distribution and Variations in Activity".
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Zamama has lower volumetric emission rates, compared with other Ionian volcanoes of the same eruptive style, and is more powerful than its terrestrial counterparts such as the volcano
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Davies, Ashley Gerard; Lopes-Gautier, Rosaly; Smythe, William D.; Carlson, Robert W. (November 2000). "Silicate Cooling Model Fits to Galileo NIMS Data of Volcanism on Io".
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Zamama region on Io showing three volcanoes (Zamama A, B, and C) marked by white arrows. Zamama (A) shield volcano and the dark main flow complex spreading eastward.
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Williams (2013) suggests the need for a variety of methods for observing Io in the future: "Future Io exploration is recommended to include: 1) a Jupiter-orbiting
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The Zamama active volcanic center is characterized morphologically by a radially centered flow field. Multiple steep-sided shield volcanoes lie in this area:
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In general, Io's eruptions have larger volumetric fluxes and active areas than terrestrial volcanoes, compared with volcanoes of the same eruption style.
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flyby in 1979, making it one of the few planetary volcanoes known to have activated during this generation's lifetime. Further analysis and study by the
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Most Ionian volcanoes start as steep-sided shield volcanoes. After an eruptive construct-building phase, the central region collapses to form a
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which is different from well-studied planetary volcanoes such as those on Mars. Two common flow field morphologies have been identified on Io:
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source of the Zamama flow field. The origin of volcanism is both siliceous and sulfuric, although Zamama originates from a Prometheus-type
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visit, or, it may have been buried by the Volund deposits. In contrast, Zamama appeared as a very active hot spot during the
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Thermal Emission Variability of Zamama, Culann and Tupan on Io Using Galileo Near-Infrared Mapping Spectrometer (NIMS) Data
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Schenk, P. M.; Wilson, R. R.; Davies, A. G. (May 2004). "Shield volcano topography and the rheology of lava flows on Io".
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Davies, Ashley Gerard (September 2003). "Volcanism on Io: Estimation of eruption parameters from Galileo NIMS data".
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Total volume erupted through this period was 3.5 ± 1.4 km (0.84 ± 0.34 cu mi).
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Average volumetric flux was 39.4 ± 15.5 m/s (1,390 ± 550 cu ft/s).
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sulfurous deposits. The composition of the lava emitted from the volcano is still mysterious.
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Zamama has lower volumetric emission rates compared to various styles of eruptions on Io.
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Lava flow field on Zamama. Image was captured using Solid-State Imaging during the
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analysis is strictly used to study such specific planetary structures.
121: 41: 548: 511: 486: 485:; Keszthelyi, Laszlo; Carlson, Robert W.; et al. (October 1997). 136: 105: 782: 171:
was derived from geomorphologic interpretations of orbital imaging.
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Zamama is more powerful than its terrestrial counterparts such as
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spacecraft helped with the overall study of Io's volcanism.
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characteristics. The flow appears to be emanating from the
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Zamama appears to have been inactive during the 1979
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This volcanic center erupted after the 572:Volcanism on Io: A Comparison with Earth 20: 466: 7: 411:Evolution of Ionian shield volcanoes 163:Most of the data acquired from the 14: 1311: 941: 777:Geissler, Paul; McEwen, Alfred; 300:1,652 ± 437 °F). 822:Journal of Geophysical Research 744:Journal of Geophysical Research 738:Keszthelyi, L.; McEwen, A. S.; 1478:Jupiter Magnetospheric Orbiter 570:Davies, Ashley Gerard (2007). 225:Radially centered flow fields. 1: 899:10.1016/j.icarus.2005.03.005 858:The Future of Io Exploration 807:10.1016/j.icarus.2003.09.024 642:10.1016/j.icarus.2004.01.015 529:Geophysical Research Letters 491:Geophysical Research Letters 16:Active volcanic center on Io 855:Williams, David A. (2013). 483:Lopes-Gautier, Rosaly M. C. 1550: 1436:Jupiter Icy Moons Explorer 576:Cambridge University Press 317:with a central vent and a 1468:Jupiter Icy Moons Orbiter 1309: 368:Average power output was 130:instruments built on the 425:Model demonstrating how 386:Comparison and evolution 1529:Volcanoes of Io (moon) 1473:Jupiter Europa Orbiter 1211:Lava flows or channels 928:10.1006/icar.2000.6486 720:10.1006/icar.1999.6129 430: 343: 290: 234: 214: 30: 1503:Io in popular culture 449:spacecraft of either 441:Future Io exploration 424: 337: 287: 232: 208: 24: 1461:Cancelled / Concepts 950:at Wikimedia Commons 842:10.1029/2001JE001509 764:10.1029/2000JE001383 750:(E12): 33025–33052. 1452:Io Volcano Observer 1292:Plains and plateaus 920:2000Icar..148..211D 891:2005Icar..177...69W 834:2003JGRE..108.5106D 799:2004Icar..169...29G 756:2001JGR...10633025K 712:1999Icar..140..243L 676:2005LPI....36.1474E 634:2004Icar..169...98S 584:2007vice.book.....D 541:1997GeoRL..24.2443M 503:1997GeoRL..24.2447D 429:volcanoes collapse. 330:Volcanic parameters 201:Volcanic topography 196:Volcanism on Zamama 143:data. 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Index


volcanic center
Jupiter
moon
Io
Voyager 1
Galileo
Io
21°N 173°W / 21°N 173°W / 21; -173
K
explosive
effusive eruption
Promethean
volcano
Remote sensing
albedo
Geomorphologic
Jovian
Io


plume

Pyroclastic
volcano
rift zone

Kīlauea
J
GW

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