نتایج جستجو برای: volcanic activity
تعداد نتایج: 1147000 فیلتر نتایج به سال:
Volcanic activity at convergent plate margins is localized along lineaments of active volcanoes that focus rising magma generated within the mantle below. In many arcs worldwide, particularly continental arcs, the volcanic front migrates away from the interface of subduction (the trench) over millions of years, reflecting coevolving surface forcing, tectonics, crustal magma transport, and mantl...
Mons Rümker is a large volcanic complex in Oceanus Procellarum on the Moon and is a candidate landing site for China’s Chang’E-5 sample return mission. We conducted a comprehensive study of the topography, geomorphology, composition, and stratigraphy of the Mons Rümker region with multisource remote sensing data in order to better understand the geology of the region and provide further support...
Three tectono-magmatic systems create volcanism in Central America; the volcanic front, a weak secondary front and the back-arc. Most magma output occurs at the volcanic front along narrow lines of historically active composite volcanoes in strikeslip/extensional settings. Lavas have strong slab signature, are water-rich and plagioclase and pyroxene phyric. A sporadic secondary front occurs abo...
An infrared thermal monitoring system installed 3.5 km from the Showa crater of Sakurajima volcano, Japan, enabled the capture of continuous thermal waveform data at 1 Hz during two recent episodes of eruptive activity. The eruptions were characterized by a sudden increase in volcanic cloud temperature in the first 2–5 s, followed by gradual cooling over a few minutes. The maximum cloud tempera...
Satellite remote sensing has increasingly become a crucial tool for volcanic activity monitoring thanks to continuous observations at global scale, provided with different spatial/spectral/temporal resolutions, on the base of specific satellite platforms, and at relatively low costs. Among the satellite techniques developed for volcanic activity monitoring, the RST (Robust Satellite Techniques)...
Methods and applications of ERS SAR interferometry for monitoring mass movements on mountain slopes and surface deformation in volcanic areas have been investigated in order to explore the operational potential of interferometry for the assessment of natural hazards. A statistical analysis was carried out in a region of the Eastern Alps to study the potential of SAR for monitoring slope motion ...
Kepsut-Dursunbey volcanic field (KDVF) is located in NW Turkey and contains various products of the post-collisional Neogene magmatic activity. Two distinct volcanic suites have been recognized; the Kepsut volcanic suite (KVS) and the Dursunbey volcanic suite (DVS). The KVS includes basaltic trachyandesitebasaltic andesite-andesite lavas and associated pyroclastic rocks. The DVS consists of dac...
Natural climate variation, such as that caused by volcanoes, is the basis for identifying anthropogenic climate change. However, knowledge of the history of volcanic activity is inadequate, particularly concerning the explosivity of specific events. Some material is deposited in ice cores, but the concentration of glacial sulfate does not distinguish between tropospheric and stratospheric erupt...
The Dongpan section in southern Guangxi Province records the influence of local volcanic activity on marine sedimentation at intermediate water depths (~200-500 m) in the Nanpanjiang Basin (South China) during the late Permian crisis. We analyzed ~100 samples over a 12-m-thick interval, generating palynological, paleobiological, and geochemical datasets to investigate the nature and causes of e...
Seismoacoustic evidence for volcanic activity on the ultraslow- spreading Gakkel Ridge, Arctic Ocean
[1] In 1999, a swarm of earthquakes and a lava flow signaled a volcanic eruption at the eastern end of Gakkel Ridge, the slowest spreading ridge worldwide. In summer 2001, the multidisciplinary Arctic Mid-Ocean Ridge Expedition studied these ridge processes which are unusual at ultraslow spreading rates. As part of these studies, we examined the microearthquake activity of the ridge with seismo...
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