Tall cinder cones atop the summit of Mauna Kea (4,205m) and lava flows that underlie its steep upper flanks have built the volcano a scant 35 m higher than nearby Mauna Loa (4,170 m). Mauna Kea, like Hawai`i's other older volcanoes, Hualalai and Kohala, has evolved beyond the shield-building stage, as indicated by (1) the very low eruption rates compared to Mauna Loa and Kilauea; (2) the absence of a summit caldera and elongated fissure vents that radiate its summit; (3) steeper and more irregular topography (for example, the upper flanks of Mauna Kea are twice as steep as those of Mauna Loa); and (4) different chemical compositions of the lava.
Kīlauea is the youngest and southeastern most volcano on the Big Island of Hawai`i. Topographically Kīlauea appears as only a bulge on the southeastern flank of Mauna Loa, and so for many years Kīlauea was thought to be a mere satellite of its giant neighbor, not a separate volcano. However, research over the past few decades shows clearly that Kīlauea has its own magma-plumbing system, extending to the surface from more than 60 km deep in the earth.
Welcome to Mauna Kea Summit Adventures home of the original Sunset and Stargazing tour. Inside you'll find beautiful photography, live cams, complete links to everything related to Mauna Kea and ,of course, information about our famous Sunset and Stargazing trip. E Komo Mai !
A magma felszíni tevékenysége a vulkanizmus: ebből keletkeznek világszerte a vulkáni kúpok, vulkáni hegységek. Vulkanizmusról csak akkor beszélünk, ha a magma eléri a Föld felszínét (ilyenkor láva lesz belőle). Olyankor, amikor a magma a mélységben megreked, és ott kristályosodik kőzetté, a folyamat neve magmatizmus. A vulkáni tevékenység és a hozzá kapcsolódó jelenségek vizsgálatával a vulkanológia foglalkozik.
Mauna Loa makes up about half of the Big Island of Hawai'i. The mountain has been designated a "Decade Volcano" by IAVCEI (along with fourteen other volcanoes worldwide) in recognition that it provides an excellent locale for studying volcanic processes and volcanic hazards. This web page results from meetings of Mauna Loa researchers and interested parties at American Geophysical Union meetings in 1993 and 1995. At the 1995 meeting, the hope was expressed that all ongoing Mauna Loa studies will eventually be linked to this page.
The first set of photographs was taken at Kilauea, an active shield volcano on the Big Island of Hawaii. This volcano is located over a hot spot, and is not located on a plate boundary. Shield volcanoes are the largest type of volcano on Earth and in the Solar System. Kilauea is so large and its slope is so gentle and gradual that many people visiting Volcano National Park at its summit don't realize that they are standing on the volcano. Park personnel say that people are always asking. "Where's the volcano?" This first photograph taken near the peak of Kilauea shows a former lava lake, now with a thick skin covering the still-molten magma a short distance underneath. The wispy white spots on the floor of the crater are places where steam and other volcanic gases are emerging from the magma. Visitors can take a hike along a trail crossing the lake surface.